🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 142 (from laksa134)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa142.int.ahrefs:8124/' \
  -H 'Content-Type: text/plain' \
  -H 'X-ClickHouse-Database: crawler3' \
  -H 'Authorization: Basic YXBpOg==' \
  -d 'SELECT getAhrefsURLFromUnparsed(src_unparsed) AS found_url, ifNull(toUnixTimestamp(download_stamp), 0) AS crawl_time, ifNull(toUnixTimestamp(props_url_first_seen), 0) AS first_indexed_time, download_http_code AS http_code, src_unparsed AS src_unparsed, src_root_hash AS src_root_hash, history_drop_reason AS history_drop_reason, meta_title AS meta_title, meta_descriptions AS meta_descriptions, attrs_boilerpipe_text AS attrs_boilerpipe_text, attrs_markdown AS attrs_markdown, attrs_readable_markdown AS attrs_readable_markdown, meta_canonical AS meta_canonical FROM crawler3.page_info_local FINAL PREWHERE (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://patient.info/signs-symptoms/fever\')), getAhrefsUnparsedNoserviceFromURL(\'https://patient.info/signs-symptoms/fever\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/patient.info\/signs-symptoms\/fever","crawl_time":1776124401,"first_indexed_time":1552430829,"http_code":200,"src_unparsed":"info,patient!\/signs-symptoms\/fever s443","src_root_hash":"3361025486351115142","history_drop_reason":null,"meta_title":"Fever (High Temperature): Causes, Symptoms, and Treatment","meta_descriptions":["A high temperature is called a fever. A fever is usually a symptom of an underlying condition, most often an infection. Written by a GP."],"attrs_boilerpipe_text":"Key points\nFever is a body temperature that is above 38°C (100.4°F), most often caused by viral or bacterial infections, but can be a sign of something more serious.\nCommon signs include increased temperature, chills, sweating, headache, fatigue, and muscle aches.\nYou can check if you have a high temperature by feeling if your chest and back are hotter than normal or by using a digital thermometer.\nTreatment includes getting plenty of rest, drinking fluids, and taking paracetamol or ibuprofen to ease discomfort.\nYou should see a doctor immediately if you still have a high temperature after trying treatments at home.\nBody temperature fluctuates slightly throughout the day. Normal temperature varies depending on the person, the body site where temperature is measured, and the time of day. A temperature above the normal range is known as a fever (or pyrexia).\nWhat is a fever?\nIt is usually agreed that a person with a temperature of 38 degrees (38°C) or higher has a fever. However, a temperature over 37.5°C can be considered to be a mild or low grade fever. Fevers occur in both children and adults and are very common, particularly in children. Fevers are often accompanied by sweating. Also see\nFever in children\n.\nThe normal body temperature changes throughout the day. These changes can be caused by exercise, eating, sleeping and even the time of day. The temperature is usually highest in the early evening and lowest in the early hours of the morning.\nThe average body temperature, taken with a digital thermometer in your mouth (oral temperature), is 37°C (98.6°F), but anywhere between 36.5°C (97.7°F) and 37.2°C (98.96°F) is considered normal. Armpit temperatures tend to be 0.2°C to 0.3°C lower than this.\nHigh temperature (fever) is caused by the release of certain chemicals by the immune system, usually as a result of infection or inflammation.\nMost fevers are caused by infections or other illnesses. Viral infections are the commonest causes of a fever. The high body temperature makes it more difficult for the germs (bacteria or viruses) which cause infections to survive.\nFever caused by infections\nCommon conditions that can cause fevers include:\nRespiratory tract infections and colds\n:\nsee the separate leaflet called Common cold (Upper respiratory tract infections)\n.\nFlu (influenza)\n:\nsee the separate leaflet called Flu\n.\nInfection of the gut (gastroenteritis)\n: see the separate leaflets called\nGastroenteritis in children\nand\nGastroenteritis\n.\nEar infections\n:\nsee the separate leaflet called Ear infection (Otitis media)\n.\nInfection of the tonsils\n:\nsee the separate leaflet called Tonsillitis\n.\nKidney or urinary tract infections\n: see the separate leaflets called\nUrine infection in children\n,\nCystitis in women\n,\nUrine infection in pregnancy\n,\nUrine infection in men\n,\nKidney infection (Pyelonephritis)\nand\nWhat do kidneys do?\nCommon childhood illnesses\n: for example, chickenpox (varicella), scarlet fever, rubella and whooping cough (pertussis). See the separate leaflets called\nChickenpox in children\n,\nScarlet fever\n, and\nWhooping cough\n.\nIf developing a fever after having been abroad, it is important to seek medical advice. Certain infections that can be caught abroad (such as\nMalaria\n, typhoid or yellow fever) can cause a fever.\nA child's temperature can also be raised when their teeth start to develop (their teething period), following some vaccinations, or if overheating because of too much bedding or clothing. See the separate leaflets called\nTeething\n,\nImmunisation\nand\nCot death\n.\nFever caused by other conditions\nFever can be caused by conditions other than infections but this is less common. For example, blood clots in the leg or lung can occasionally lead to a fever developing. See the separate leaflets called\nDeep vein thrombosis\nand\nPulmonary embolism\n.\nThere are some health conditions that cause inflammation in the body and these can also cause fevers at times. See the separate leaflets called\nRheumatoid arthritis\nand\nSystemic lupus erythematosus\n.\nThere are also some types of cancer which can lead to a fever developing.\nSee the separate leaflet called Cancer\n.\nSometimes the cause of the fever is not clear. This is called a fever of unknown origin.\nA high temperature (fever) is very common, particularly in children. Around 3 out of 10 young children have a fever every year. Older adults are less likely to develop a high temperature when they get an infection; however, older adults who do develop a fever with an infection have been shown to be more likely to recover quickly.\nThere are different ways of taking a temperature with a thermometer. A thermometer can be placed either under your armpit or in your ear. The forehead thermometers are no longer recommended as they are less accurate. Rectal thermometers are no longer usually used in the UK.\nAs a parent it can feel worrying if a child has a high temperature (fever). However, having a fever is very common and usually settles by itself without treatment.\nSigns of fever\nUsing a thermometer is the best way to tell if there is a fever. However the following will give a rough idea:\nThe forehead may feel hot when felt with the back of the hand. This is much more sensitive to temperature than the palm.\nCheeks may be flushed.\nFeeling hotter than others around.\nNote: Fever usually responds well to medication such as paracetamol and ibuprofen. However, these medicines do not \"cure\" a fever and, as soon as the medication wears off, the temperature will increase again. This is normal and, if wanting to reduce the fever, then regular medication will need to be given.\nFever in adults\nHow do you deal with a fever in adults?\nA high temperature (fever) is usually associated with physical discomfort and most people feel better when a fever is treated. However, depending on age, physical condition and the underlying cause of the fever, it may be best not to treat the fever.\nMany experts believe that fever helps the body fight off infections naturally.. There is some evidence that fever reduces the severity of infections and helps faster recovery. However, paracetamol and ibuprofen will both reduce the fever if needed. It is important to drink plenty of fluids to avoid becoming dehydrated from sweating.\nIf there is an obvious cause for the fever, for example a flu-like illness with aches and pains and headaches, then treating the symptoms with paracetamol or ibuprofen will also help the underlying fever. If there is a bacterial infection, for example a urine infection, then antibiotics will be needed to treat the infection but these will not reduce the fever itself.\nTests may sometimes be needed if there is no obvious cause for the fever.\nTesting may include:\nBlood tests\n.\nUrine tests\n.\nX-rays to determine the cause\n.\nFever in children\nHow do you deal with a fever in children?\nIn children, paracetamol and ibuprofen are only recommended if the child is distressed with the fever.\nWarm (tepid) sponging is no longer recommended for children to treat a fever. Drinking plenty of fluids is very important during a fever. Keeping fluid levels up is important to reduce the risk of dehydration. It is also important to make sure they are not wearing too many clothes - one layer is fine.\nNote\n: in children, giving paracetamol or ibuprofen does not reduce the risk of a seizure caused by a fever occurring.\nSee the separate leaflet called Febrile seizure (Febrile convulsion)\n.\nWhen should you see a doctor about a fever?\nYou should contact a doctor if there is a high temperature (fever) and:\nA child is under 3 months of age.\nA child is 3-6 months of age with a fever of 39 degrees or more.\nA child has a fit.\nThere is a rash that does not disappear when pressing a glass on it (a non-blanching rash), This is a potential medical emergency that requires attendance at an emergency department.\nThe person with the fever is becoming more unwell, for example with shortness of breath or chest pain.\nA fever lasts longer than five days.\nThere is no obvious cause of the fever - for example, no cough or cold symptoms.\nThere may be a bacterial infection causing of the fever - for example, a urinary tract infection or a red hot swollen joint.\nNote: Fever itself is not harmful. Many people think they need to seek medical advice when a temperature reaches, for example, 39 degrees in a toddler. If there is an obvious cause for the temperature (for example, a cold with a runny nose) then medical advice does not need to be sought just because of the height of the temperature. This advice is different for babies under 6 months of age.\nWhat are the types of fever?\nCommon types include continuous fever, where the temperature stays high with little variation, intermittent fever, where it comes and goes, and remittent fever, where it rises and falls but never fully returns to normal.\nWhat is a fever dream?\nA fever dream is a vivid or unsettling dream that happens when you have a fever. The changes in brain activity and sleep patterns can make your dreams feel more intense, strange, or even frightening. They usually pass once the fever settles.\nArticle history\nThe information on this page is written and peer reviewed by qualified clinicians.\nNext review due: 7 Sept 2027\n8 Sept 2024\n| Latest version","attrs_markdown":"![](https:\/\/stats.patient.info\/matomo.php?idsite=1&rec=1)\n\n[Skip to main content](https:\/\/patient.info\/signs-symptoms\/fever#content)\n\nSign in\n\nSearch\n\n- [Home](https:\/\/patient.info\/)\n- [Health advice](https:\/\/patient.info\/health)\n- [Medicines and treatment](https:\/\/patient.info\/medicine)\n- [Tools and resources](https:\/\/patient.info\/medical-calculators)\n- [Community](https:\/\/patient.info\/community)\n- [Medical professionals](https:\/\/patient.info\/doctor)\n\n- [Health topics Trusted patient information leaflets with clear, clinically reviewed advice on conditions, symptoms and treatments.](https:\/\/patient.info\/)\n  \n  - ###### Health topics\n    [All health topics](https:\/\/patient.info\/health)\n    [Allergies, blood and immune system](https:\/\/patient.info\/allergies-blood-immune)\n    \n    [Bones, joints and muscles](https:\/\/patient.info\/bones-joints-muscles)\n    \n    [Brain and nerves](https:\/\/patient.info\/brain-nerves)\n    \n    [Cancer](https:\/\/patient.info\/cancer)\n    \n    [Chest and lungs](https:\/\/patient.info\/chest-lungs)\n    \n    [Children's health](https:\/\/patient.info\/childrens-health)\n    \n    [Diabetes](https:\/\/patient.info\/diabetes)\n    \n    [Digestive health](https:\/\/patient.info\/digestive-health)\n    \n    [Ear, nose and throat](https:\/\/patient.info\/ear-nose-throat)\n    \n    [Eye health](https:\/\/patient.info\/eye-care)\n    \n    [Foot care](https:\/\/patient.info\/foot-care)\n    \n    [General health](https:\/\/patient.info\/general-health-and-lifestyle)\n    \n    [Healthy living](https:\/\/patient.info\/healthy-living)\n    \n    [Heart health and blood vessels](https:\/\/patient.info\/heart-health)\n    \n    [Hormones](https:\/\/patient.info\/hormones)\n    \n    [Infections](https:\/\/patient.info\/infections)\n    \n    [Kidney and urinary tract](https:\/\/patient.info\/kidney-urinary-tract)\n    \n    [Men's health](https:\/\/patient.info\/mens-health)\n    \n    [Mental health](https:\/\/patient.info\/mental-health)\n    \n    [Oral and dental care](https:\/\/patient.info\/oral-dental-care)\n    \n    [Pregnancy](https:\/\/patient.info\/pregnancy)\n    \n    [Senior health](https:\/\/patient.info\/senior-health)\n    \n    [Sexual health](https:\/\/patient.info\/sexual-health)\n    \n    [Signs and symptoms](https:\/\/patient.info\/signs-symptoms)\n    \n    [Skin, nail and hair health](https:\/\/patient.info\/skin-conditions)\n    \n    [Surgery and procedures](https:\/\/patient.info\/surgery-procedures)\n    \n    [Tests and investigations](https:\/\/patient.info\/about-tests-and-investigations)\n    \n    [Travel and vaccinations](https:\/\/patient.info\/travel-and-vaccinations)\n    \n    [Treatment and medication](https:\/\/patient.info\/treatment-medication)\n    \n    [Women's health](https:\/\/patient.info\/womens-health)\n  \n  [Healthy living Expert features, lifestyle guidance and real-life stories designed to support your everyday health and wellbeing.](https:\/\/patient.info\/)\n  \n  - 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###### GP practice services\n    [NHS App](https:\/\/patient.info\/gp-practice-services)\n    \n    [Pharmacy First](https:\/\/patient.info\/pharmacy-first)\n    \n    [Patient Record Access](https:\/\/patient.info\/health\/patient-records-access)\n  \n  [Pharmacy services Help with common conditions under the NHS Pharmacy First scheme, with prescription medication, delivered for free.](https:\/\/patient.info\/)\n  \n  - ###### Pharmacy First\n    [What is NHS pharmacy first](https:\/\/patient.info\/pharmacy-first)\n    [Shingles](https:\/\/patient.info\/skin-conditions\/shingles-herpes-zoster-leaflet)\n    \n    [Impetigo](https:\/\/patient.info\/childrens-health\/impetigo-leaflet)\n    \n    [Sinusitis](https:\/\/patient.info\/ears-nose-throat-mouth\/acute-sinusitis)\n    \n    [Infected insect bite](https:\/\/patient.info\/skin-conditions\/insect-bites-and-stings-leaflet)\n    \n    [Sore throat](https:\/\/patient.info\/ears-nose-throat-mouth\/sore-throat-2)\n    \n    [UTI](https:\/\/patient.info\/kidney-urinary-tract\/urinary-tract-infections)\n    \n    [Contraception](https:\/\/patient.info\/news-and-features\/easy-ways-to-get-the-pill-options-beyond-the-gp-surgery)\n    \n    [Weight loss treatments](https:\/\/patient.info\/weight-loss-management)\n- [Medical tools and resources Take charge of your health with easy-to-use tools and trusted resources.](https:\/\/patient.info\/)\n  \n  - ###### Patient tools and resources\n    [All medical calculators, tools and resources](https:\/\/patient.info\/medical-calculators)\n    [Symptom checker](https:\/\/patient.info\/symptom-checker)\n    \n    [AskPatient Ai](https:\/\/patient.info\/ask\/patient)\n    \n    [Personalised digital habit coaching](https:\/\/patient.info\/features\/healthy-living\/building-healthier-habits)\n    \n    [BMI calculator](https:\/\/patient.info\/healthy-living\/calculate-bmi)\n    \n    [Generalised anxiety disorder assessment](https:\/\/patient.info\/doctor\/mental-health\/gad-7)\n    \n    [Patient health questionnaire](https:\/\/patient.info\/doctor\/mental-health\/phq-9)\n    \n    [Pregnancy due date calculator](https:\/\/patient.info\/doctor\/pregnancy-due-date-calculator)\n    \n    [Ovulation calculator](https:\/\/patient.info\/pregnancy\/ovulation-calculator)\n    \n    [Sleep debt calculator](https:\/\/patient.info\/healthy-living\/sleep-debt-calculator)\n    \n    [Calorie calculator](https:\/\/patient.info\/healthy-living\/calorie-calculator)\n    \n    [BMR (Basal Metabolic Rate) calculator](https:\/\/patient.info\/healthy-living\/basal-metabolic-rate-calculator)\n    \n    [Glucose Ketone Index (GKI) calculator](https:\/\/patient.info\/healthy-living\/glucose-ketone-index-gki-calculator)\n    \n    [Epworth sleepiness scale](https:\/\/patient.info\/signs-symptoms\/tiredness-fatigue\/epworth-sleepiness-scale)\n    \n    [Asthma control test (ACT)](https:\/\/patient.info\/chest-lungs\/asthma-control-test)\n    \n    [Benefits checker](https:\/\/patient.info\/general-health\/benefits-calculator)\n    \n    [PIP helper](https:\/\/patient.info\/general-health\/check-your-personal-independence-payment-pip-eligibility)\n    \n    [Patient.info app](https:\/\/patient.info\/app)\n    \n    [Pollen map](https:\/\/patient.info\/features\/allergies-blood-immune\/pollen-map)\n  \n  [Healthy eating Healthy recipe inspiration for nourishing meals and everyday wellbeing.](https:\/\/patient.info\/)\n  \n  - ###### Healthy eating\n    [Browse all recipes](https:\/\/patient.info\/recipes)\n    [Balanced nutrition](https:\/\/patient.info\/recipes\/balanced-nutrition-recipes)\n    \n    [Diabetes friendly](https:\/\/patient.info\/recipes\/diabetes-friendly-recipes)\n    \n    [Heart healthy](https:\/\/patient.info\/recipes\/heart-healthy-recipes)\n    \n    [High protein](https:\/\/patient.info\/recipes\/high-protein-recipes)\n    \n    [Low fat](https:\/\/patient.info\/recipes\/low-fat-recipes)\n    \n    [Low sugar](https:\/\/patient.info\/recipes\/low-sugar-recipes)\n    \n    [Vegan](https:\/\/patient.info\/recipes\/vegan-recipes)\n    \n    [Vegetarian](https:\/\/patient.info\/recipes\/vegetarian-recipes)\n  \n  [Health and wellness video library Discover our library of trusted health videos.](https:\/\/patient.info\/)\n  \n  - ###### Health and wellness video library\n    [All health and wellness videos](https:\/\/patient.info\/video-library)\n    \n    [Visit our YouTube channel](https:\/\/www.youtube.com\/patient)\n    [Bones, joints and muscles](https:\/\/patient.info\/video-library#bones,jointsandmuscles)\n    \n    [Cancer](https:\/\/patient.info\/video-library#cancer)\n    \n    [Diabetes](https:\/\/patient.info\/video-library#diabetes)\n    \n    [General health and lifestyle](https:\/\/patient.info\/video-library#generalhealthandlifestyle)\n    \n    [Infections](https:\/\/patient.info\/video-library#infections)\n    \n    [Mental health](https:\/\/patient.info\/video-library#mentalhealth)\n    \n    [Other conditions](https:\/\/patient.info\/video-library#otherconditions)\n    \n    [Pregnancy and miscarriage](https:\/\/patient.info\/video-library#pregnancyandmiscarriage)\n    \n    [Sexual health and contraception](https:\/\/patient.info\/video-library#sexualhealthandcontraception)\n    \n    [Women's health](https:\/\/patient.info\/video-library#women'shealth)\n    \n    [Explore more videos on YouTube](https:\/\/www.youtube.com\/patient)\n  \n  [Self-assessment quizzes Our self-assessment quizzes can help you recognise signs of common health conditions.](https:\/\/patient.info\/)\n  \n  - ###### Self-assessment quizzes\n    [All self-assessment quizzes](https:\/\/patient.info\/self-assessment)\n    [Depression](https:\/\/patient.info\/self-assessment#depression)\n    \n    [Diabetes](https:\/\/patient.info\/self-assessment#diabetes)\n    \n    [OCD](https:\/\/patient.info\/self-assessment#ocd)\n    \n    [Periods](https:\/\/patient.info\/self-assessment#periods)\n    \n    [Pregnancy](https:\/\/patient.info\/self-assessment#pregnancy)\n  \n  [Brain teasers Explore daily brain teasers that challenge how you think, reason and solve problems.](https:\/\/patient.info\/)\n  \n  - ###### Brain teasers\n    [Leaderboard](https:\/\/patient.info\/brain-teasers\/leaderboard)\n    \n    [Your progress and scores](https:\/\/patient.info\/brain-teasers\/profile)\n    [All brain teasers](https:\/\/patient.info\/brain-teasers)\n    \n    [Complete the daily challenge](https:\/\/patient.info\/brain-teasers\/daily-challenge)\n    \n    [The Daily Decode](https:\/\/patient.info\/brain-teasers\/cryptogram)\n    \n    [Myth or Fact](https:\/\/patient.info\/brain-teasers\/myth-or-fact)\n    \n    [Symptoms Sort](https:\/\/patient.info\/brain-teasers\/symptoms-sort)\n    \n    [Word Ladder](https:\/\/patient.info\/brain-teasers\/word-ladder)\n- [Patient communities Browse discussions, ask questions, and share experiences across hundreds of health topics – all in a safe, supportive space.](https:\/\/patient.info\/)\n  \n  - ###### Patient communities\n    [Log in](https:\/\/community.patient.info\/login)\n    \n    [Sign up](https:\/\/community.patient.info\/signup)\n    [Browse all patient communities](https:\/\/community.patient.info\/)\n    [Allergies, blood and immune system](https:\/\/community.patient.info\/c\/allergies-blood-and-immune-system\/4)\n    \n    [Bones, joints and muscles](https:\/\/community.patient.info\/c\/bones-joints-and-muscles\/2)\n    \n    [Brain and nerves](https:\/\/community.patient.info\/c\/brain-and-nerves\/6)\n    \n    [Cancer](https:\/\/community.patient.info\/c\/cancer\/7)\n    \n    [Chest and lungs](https:\/\/community.patient.info\/c\/chest-and-lungs\/8)\n    \n    [Children's health](https:\/\/community.patient.info\/c\/childrens-health\/9)\n    \n    [Cosmetic surgery](https:\/\/community.patient.info\/c\/cosmetic-surgery\/40)\n    \n    [Diabetes](https:\/\/community.patient.info\/c\/diabetes\/11)\n    \n    [Digestive health](https:\/\/community.patient.info\/c\/digestive-health\/16)\n    \n    [Ears, nose and throat](https:\/\/community.patient.info\/c\/ears-nose-and-throat\/12)\n    \n    [Eye care](https:\/\/community.patient.info\/c\/eye-care\/13)\n    \n    [Foot care](https:\/\/community.patient.info\/c\/foot-care\/41)\n    \n    [General health and lifestyle](https:\/\/community.patient.info\/c\/general-health-and-lifestyle\/43)\n    \n    [Heart health and blood vessels](https:\/\/community.patient.info\/c\/heart-health-and-blood-vessels\/18)\n    \n    [Hormones](https:\/\/community.patient.info\/c\/hormones\/45)\n    \n    [Infections](https:\/\/community.patient.info\/c\/infections\/20)\n    \n    [Kidney and urinary tract](https:\/\/community.patient.info\/c\/kidney-and-urinary-tract\/15)\n    \n    [Men's health](https:\/\/community.patient.info\/c\/mens-health\/24)\n    \n    [Mental health](https:\/\/community.patient.info\/c\/mental-health\/25)\n    \n    [Oral and dental care](https:\/\/community.patient.info\/c\/oral-and-dental-care\/44)\n    \n    [Pregnancy](https:\/\/community.patient.info\/c\/pregnancy\/27)\n    \n    [Senior health](https:\/\/community.patient.info\/c\/senior-health\/28)\n    \n    [Sexual health](https:\/\/community.patient.info\/c\/sexual-health\/10)\n    \n    [Signs and symptoms](https:\/\/community.patient.info\/c\/signs-and-symptoms\/30)\n    \n    [Skin, nail and hair health](https:\/\/community.patient.info\/c\/skin-nail-and-hair-health\/29)\n    \n    [Tests and investigations](https:\/\/community.patient.info\/c\/tests-and-investigations\/32)\n    \n    [Travel and vaccinations](https:\/\/community.patient.info\/c\/travel-and-vaccinations\/39)\n    \n    [Treatment and medication](https:\/\/community.patient.info\/c\/treatment-and-medication\/19)\n    \n    [Women's health](https:\/\/community.patient.info\/c\/womens-health\/33)\n    \n    [Other conditions](https:\/\/community.patient.info\/c\/other-conditions\/34)\n  \n  [Patient voices Hear directly from people living with health conditions - everyday experiences, tough decisions, unexpected triumphs, and everything in between.](https:\/\/patient.info\/)\n  \n  - ###### Patient voices\n    [Browse all stories](https:\/\/patient.info\/patient-voices)\n    [Children's health](https:\/\/patient.info\/patient-voices#children'shealth)\n    \n    [Hearing](https:\/\/patient.info\/patient-voices#hearing)\n    \n    [Mental health](https:\/\/patient.info\/patient-voices#mentalhealth)\n    \n    [Senior health](https:\/\/patient.info\/patient-voices#seniorhealth)\n    \n    [Women's health](https:\/\/patient.info\/patient-voices#women'shealth)\n  \n  [Podcasts Candid conversations on health from celebrities, experts and real people.](https:\/\/patient.info\/)\n  \n  - ###### Patient podcasts\n    [Browse all podcasts](https:\/\/patient.info\/features\/podcast)\n    [Yorkshire Talks](https:\/\/patient.info\/features\/podcast#yorkshiretalks)\n    \n    [Sex and Relationships](https:\/\/patient.info\/features\/podcast#thesexandrelationshipspodcast)\n- [Medical professional hub Information and tools written by clinicians for medical professionals, and training resources.](https:\/\/patient.info\/)\n  \n  - ###### Medical professional hub\n    [Medical professional content hub](https:\/\/patient.info\/doctor)\n    \n    [Clinical topics](https:\/\/patient.info\/doctor\/articles)\n    \n    [Professional articles A-Z](https:\/\/patient.info\/doctor\/articles#a-z-a)\n    \n    [Medicines information](https:\/\/patient.info\/medicine)\n    \n    [Medical tools and resources for professionals](https:\/\/patient.info\/doctor\/professional-tools-and-resources)\n  \n  [Professional articles Evidence-based professional reference pages authored by our clinical team for the use of medical professionals.](https:\/\/patient.info\/)\n  \n  - ###### Professional articles\n    [View all professional articles A-Z](https:\/\/patient.info\/doctor\/articles#a-z-a)\n    \n    [Browse by clinical topic](https:\/\/patient.info\/doctor\/articles)\n    [Anaesthetics and pain control](https:\/\/patient.info\/doctor\/anaesthetics)\n    \n    [Cardiovascular disease](https:\/\/patient.info\/doctor\/cardiovascular-disease)\n    \n    [Congenital and inherited disorders](https:\/\/patient.info\/doctor\/congenital-disorders)\n    \n    [Dermatology](https:\/\/patient.info\/doctor\/dermatology)\n    \n    [Drug therapy](https:\/\/patient.info\/doctor\/drug-therapy)\n    \n    [Ear, nose and throat](https:\/\/patient.info\/doctor\/ear-nose-throat)\n    \n    [Emergency medicine and trauma](https:\/\/patient.info\/doctor\/emergency-medicine)\n    \n    [Endocrine disorders](https:\/\/patient.info\/doctor\/endocrine-disorders)\n    \n    [Fertility and reproduction](https:\/\/patient.info\/doctor\/fertility)\n    \n    [Gastroenterology](https:\/\/patient.info\/doctor\/gastroenterology)\n    \n    [General surgery](https:\/\/patient.info\/doctor\/general-surgery)\n    \n    [Gynaecology](https:\/\/patient.info\/doctor\/gynaecology)\n    \n    [Haematology](https:\/\/patient.info\/doctor\/haematology)\n    \n    [History and examination](https:\/\/patient.info\/doctor\/history-examination)\n    \n    [Infectious disease](https:\/\/patient.info\/doctor\/infectious-disease)\n    \n    [Information governance and security](https:\/\/patient.info\/doctor\/information-governance-and-security)\n    \n    [Investigations](https:\/\/patient.info\/doctor\/investigations)\n    \n    [Mental health](https:\/\/patient.info\/doctor\/mental-health)\n    \n    [Mouth and dental disorders](https:\/\/patient.info\/doctor\/mouth-dental-disorders)\n    \n    [Multisystem disease](https:\/\/patient.info\/doctor\/multisystem-diseases)\n    \n    [Neurology](https:\/\/patient.info\/doctor\/neurology)\n    \n    [Nutrition](https:\/\/patient.info\/doctor\/nutrition)\n    \n    [Obstetrics](https:\/\/patient.info\/doctor\/obstetrics)\n    \n    [Occupational illness](https:\/\/patient.info\/doctor\/occupational-illness)\n    \n    [Oncology](https:\/\/patient.info\/doctor\/oncology)\n    \n    [Ophthalmology](https:\/\/patient.info\/doctor\/ophthalmology)\n    \n    [Orthopaedics and sports medicine](https:\/\/patient.info\/doctor\/orthopaedics)\n    \n    [Paediatrics](https:\/\/patient.info\/doctor\/paediatrics)\n    \n    [Palliative and terminal care](https:\/\/patient.info\/doctor\/palliative-terminal-care)\n    \n    [Pathological processes](https:\/\/patient.info\/doctor\/pathological-processes)\n    \n    [Primary care](https:\/\/patient.info\/doctor\/primary-care)\n    \n    [Public health medicine](https:\/\/patient.info\/doctor\/public-health-medicine)\n    \n    [Renal disorders](https:\/\/patient.info\/doctor\/renal-disorders)\n    \n    [Respiratory medicine](https:\/\/patient.info\/doctor\/respiratory-medicine)\n    \n    [Rheumatology](https:\/\/patient.info\/doctor\/rheumatology)\n    \n    [Screening and prevention](https:\/\/patient.info\/doctor\/screening-prevention)\n    \n    [Social care](https:\/\/patient.info\/doctor\/social-care)\n    \n    [Therapies](https:\/\/patient.info\/doctor\/therapies)\n    \n    [Thinking about medicine](https:\/\/patient.info\/doctor\/thinking-about-medicine)\n    \n    [Toxicology and iatrogenic disorders](https:\/\/patient.info\/doctor\/toxicology)\n    \n    [Travel related disease](https:\/\/patient.info\/doctor\/travel-related-disease)\n    \n    [Urology](https:\/\/patient.info\/doctor\/urology)\n  \n  [Medical tools and resources Clinical tools for medical professional use.](https:\/\/patient.info\/)\n  \n  - ###### Medical tools and resources\n    [All medical tools and resources](https:\/\/patient.info\/medical-calculators)\n    \n    [All clinical calculators](https:\/\/patient.info\/doctor\/professional-tools-and-resources)\n    [BMI calculator](https:\/\/patient.info\/healthy-living\/calculate-bmi)\n    \n    [Generalised anxiety disorder assessment](https:\/\/patient.info\/doctor\/mental-health\/gad-7)\n    \n    [Patient health questionnaire](https:\/\/patient.info\/doctor\/mental-health\/phq-9)\n    \n    [Pregnancy due date calculator](https:\/\/patient.info\/doctor\/pregnancy-due-date-calculator)\n    \n    [Digital Paediatric Growth Charts](https:\/\/patient.info\/doctor\/professional-tools-and-resources\/growth-charts)\n    \n    [Social media toolkit](https:\/\/patient.info\/social-media-toolkit)\n\n- [Health topics](https:\/\/patient.info\/health)\n- [Signs and symptoms](https:\/\/patient.info\/signs-symptoms)\n- Fever\n\n# Fever\n## High temperature\nPeer reviewed by [Dr Hayley Willacy, FRCGP](https:\/\/patient.info\/authors\/dr-hayley-willacy) Last updated by [Dr Colin Tidy, MRCGP](https:\/\/patient.info\/authors\/dr-colin-tidy)Last updated 8 Sept 2024\n\nMeets Patient’s [editorial guidelines](https:\/\/patient.info\/editorial-policy)Est. **6 min** reading time\n\n- Download\n  [Download](https:\/\/pdf.patient.info\/?url=https%3A%2F%2Fpatient.info%2Fsigns-symptoms%2Ffever)\n  Article PDF has been downloaded\n- Share\n  #### Share\n  - [Share via email](mailto:?subject=Patient%20-%20Fever&body=https%3A%2F%2Fpatient.info%2Fsigns-symptoms%2Ffever)\n  - [Share via Facebook](https:\/\/www.facebook.com\/sharer\/sharer.php?u=https%3A%2F%2Fpatient.info%2Fsigns-symptoms%2Ffever)\n  - [Share via LinkedIn](https:\/\/www.linkedin.com\/sharing\/share-offsite\/?url=https%3A%2F%2Fpatient.info%2Fsigns-symptoms%2Ffever)\n  - [Share via X](https:\/\/x.com\/intent\/post?text=Patient%20-%20Fever&url=https%3A%2F%2Fpatient.info%2Fsigns-symptoms%2Ffever)\n  - [Share via WhatsApp](https:\/\/api.whatsapp.com\/send?text=Patient%20-%20Fever%20https%3A%2F%2Fpatient.info%2Fsigns-symptoms%2Ffever)\n  - [Copy link](https:\/\/patient.info\/signs-symptoms\/fever#copy)\n  Article link copied to clipboard\n- Language\n  #### Language\n  - [English](https:\/\/patient.info\/signs-symptoms\/fever)\n  - [Deutsch](https:\/\/de.patient.info\/signs-symptoms\/fever)\n  - [Español](https:\/\/es.patient.info\/signs-symptoms\/fever)\n  - [Français](https:\/\/fr.patient.info\/signs-symptoms\/fever)\n  - [Italiano](https:\/\/it.patient.info\/signs-symptoms\/fever)\n  - [Português](https:\/\/pt.patient.info\/signs-symptoms\/fever)\n- Discussion\n- Audio Version\n\nA fever, also known as a high temperature or high fever, is when your body temperature temporarily rises above 38°C (100.4°F). Fever itself is not an illness and is usually a symptom of an underlying condition, such as an infection.\n\nThis leaflet explains the what causes a fever, signs you have a fever, and when you should see a doctor.\n\n### In this article:\n- [What is a fever?](https:\/\/patient.info\/signs-symptoms\/fever#what-is-a-fever)\n- [What temperature is a fever?](https:\/\/patient.info\/signs-symptoms\/fever#what-temperature-is-a-fever)\n- [What is a normal temperature?](https:\/\/patient.info\/signs-symptoms\/fever#what-is-a-normal-temperature)\n- [What causes a fever?](https:\/\/patient.info\/signs-symptoms\/fever#what-causes-a-fever)\n- [How common is a fever?](https:\/\/patient.info\/signs-symptoms\/fever#how-common-is-a-fever)\n- [How do I take my temperature?](https:\/\/patient.info\/signs-symptoms\/fever#how-do-i-take-my-temperature)\n- [How to reduce a fever](https:\/\/patient.info\/signs-symptoms\/fever#how-to-reduce-a-fever)\n- [Frequently asked questions](https:\/\/patient.info\/signs-symptoms\/fever#frequently-asked-questions)\n- [Further reading and references](https:\/\/patient.info\/signs-symptoms\/fever#furtherreading)\n#### Video picks for Fever\n## Key points\n- Fever is a body temperature that is above 38°C (100.4°F), most often caused by viral or bacterial infections, but can be a sign of something more serious.\n- Common signs include increased temperature, chills, sweating, headache, fatigue, and muscle aches.\n- You can check if you have a high temperature by feeling if your chest and back are hotter than normal or by using a digital thermometer.\n- Treatment includes getting plenty of rest, drinking fluids, and taking paracetamol or ibuprofen to ease discomfort.\n- You should see a doctor immediately if you still have a high temperature after trying treatments at home.\n## What is a fever?\nBody temperature fluctuates slightly throughout the day. Normal temperature varies depending on the person, the body site where temperature is measured, and the time of day. A temperature above the normal range is known as a fever (or pyrexia).\n\n## What is a fever?\n[Dr Sarah Jarvis MBE, FRCGP](https:\/\/patient.info\/authors\/dr-sarah-jarvis-mbe)\n\n## What temperature is a fever?\n[Back to contents](https:\/\/patient.info\/signs-symptoms\/fever#toc)\n\nIt is usually agreed that a person with a temperature of 38 degrees (38°C) or higher has a fever. However, a temperature over 37.5°C can be considered to be a mild or low grade fever. Fevers occur in both children and adults and are very common, particularly in children. Fevers are often accompanied by sweating. Also see [Fever in children](https:\/\/patient.info\/childrens-health\/fever-in-children-high-temperature).\n\n## What is a normal temperature?\n[Back to contents](https:\/\/patient.info\/signs-symptoms\/fever#toc)\n\nThe normal body temperature changes throughout the day. These changes can be caused by exercise, eating, sleeping and even the time of day. The temperature is usually highest in the early evening and lowest in the early hours of the morning.\n\nThe average body temperature, taken with a digital thermometer in your mouth (oral temperature), is 37°C (98.6°F), but anywhere between 36.5°C (97.7°F) and 37.2°C (98.96°F) is considered normal. Armpit temperatures tend to be 0.2°C to 0.3°C lower than this.\n\n## What causes a fever?\n[Back to contents](https:\/\/patient.info\/signs-symptoms\/fever#toc)\n\nHigh temperature (fever) is caused by the release of certain chemicals by the immune system, usually as a result of infection or inflammation.\n\nMost fevers are caused by infections or other illnesses. Viral infections are the commonest causes of a fever. The high body temperature makes it more difficult for the germs (bacteria or viruses) which cause infections to survive.\n\n### Fever caused by infections\nCommon conditions that can cause fevers include:\n\n- **Respiratory tract infections and colds**: [see the separate leaflet called Common cold (Upper respiratory tract infections)](https:\/\/patient.info\/chest-lungs\/cough-leaflet\/common-cold-upper-respiratory-tract-infections).\n- **Flu (influenza)**: [see the separate leaflet called Flu](https:\/\/patient.info\/infections\/influenza-and-flu-like-illness).\n- **Infection of the gut (gastroenteritis)**: see the separate leaflets called [Gastroenteritis in children](https:\/\/patient.info\/childrens-health\/acute-diarrhoea-in-children\/gastroenteritis-in-children) and [Gastroenteritis](https:\/\/patient.info\/digestive-health\/diarrhoea\/gastroenteritis).\n- **Ear infections**: [see the separate leaflet called Ear infection (Otitis media)](https:\/\/patient.info\/ears-nose-throat-mouth\/earache-ear-pain\/ear-infection-otitis-media).\n- **Infection of the tonsils**: [see the separate leaflet called Tonsillitis](https:\/\/patient.info\/ears-nose-throat-mouth\/sore-throat-2\/tonsillitis).\n- **Kidney or urinary tract infections**: see the separate leaflets called [Urine infection in children](https:\/\/patient.info\/document\/urine-infection-in-children), [Cystitis in women](https:\/\/patient.info\/womens-health\/lower-urinary-tract-symptoms-in-women-luts\/cystitis-in-women), [Urine infection in pregnancy](https:\/\/patient.info\/pregnancy\/pregnancy-complications\/urine-infection-in-pregnancy), [Urine infection in men](https:\/\/patient.info\/mens-health\/urine-infection-in-men), [Kidney infection (Pyelonephritis)](https:\/\/patient.info\/kidney-urinary-tract\/kidney-infection-pyelonephritis) and [What do kidneys do?](https:\/\/patient.info\/features\/kidney-urinary-tract\/what-do-kidneys-do)\n- **Common childhood illnesses**: for example, chickenpox (varicella), scarlet fever, rubella and whooping cough (pertussis). See the separate leaflets called [Chickenpox in children](https:\/\/patient.info\/skin-conditions\/viral-rashes\/chickenpox-in-children), [Scarlet fever](https:\/\/patient.info\/skin-conditions\/viral-rashes\/scarlet-fever), and [Whooping cough](https:\/\/patient.info\/infections\/whooping-cough).\n\nIf developing a fever after having been abroad, it is important to seek medical advice. Certain infections that can be caught abroad (such as [Malaria](https:\/\/patient.info\/travel-and-vaccinations\/malaria-leaflet), typhoid or yellow fever) can cause a fever.\n\nA child's temperature can also be raised when their teeth start to develop (their teething period), following some vaccinations, or if overheating because of too much bedding or clothing. See the separate leaflets called [Teething](https:\/\/patient.info\/childrens-health\/teething), [Immunisation](https:\/\/patient.info\/childrens-health\/immunisation) and [Cot death](https:\/\/patient.info\/childrens-health\/sudden-infant-death-cot-death).\n\n### Fever caused by other conditions\nFever can be caused by conditions other than infections but this is less common. For example, blood clots in the leg or lung can occasionally lead to a fever developing. See the separate leaflets called [Deep vein thrombosis](https:\/\/patient.info\/allergies-blood-immune\/deep-vein-thrombosis-leaflet) and [Pulmonary embolism](https:\/\/patient.info\/signs-symptoms\/breathlessness-and-breathing-difficulties-dyspnoea\/pulmonary-embolism).\n\nThere are some health conditions that cause inflammation in the body and these can also cause fevers at times. See the separate leaflets called [Rheumatoid arthritis](https:\/\/patient.info\/bones-joints-muscles\/rheumatoid-arthritis-leaflet) and [Systemic lupus erythematosus](https:\/\/patient.info\/skin-conditions\/lupus-systemic-lupus-erythematosus).\n\nThere are also some types of cancer which can lead to a fever developing. [See the separate leaflet called Cancer](https:\/\/patient.info\/cancer\/cancer).\n\nSometimes the cause of the fever is not clear. This is called a fever of unknown origin.\n\n## How common is a fever?\n[Back to contents](https:\/\/patient.info\/signs-symptoms\/fever#toc)\n\nA high temperature (fever) is very common, particularly in children. Around 3 out of 10 young children have a fever every year. Older adults are less likely to develop a high temperature when they get an infection; however, older adults who do develop a fever with an infection have been shown to be more likely to recover quickly.\n\n## How do I take my temperature?\n[Back to contents](https:\/\/patient.info\/signs-symptoms\/fever#toc)\n\nThere are different ways of taking a temperature with a thermometer. A thermometer can be placed either under your armpit or in your ear. The forehead thermometers are no longer recommended as they are less accurate. Rectal thermometers are no longer usually used in the UK.\n\nAs a parent it can feel worrying if a child has a high temperature (fever). However, having a fever is very common and usually settles by itself without treatment.\n\n### Signs of fever\nUsing a thermometer is the best way to tell if there is a fever. However the following will give a rough idea:\n\n- The forehead may feel hot when felt with the back of the hand. This is much more sensitive to temperature than the palm.\n- Cheeks may be flushed.\n- Feeling hotter than others around.\n\n## How to reduce a fever\n[Back to contents](https:\/\/patient.info\/signs-symptoms\/fever#toc)\n\n**Note: Fever usually responds well to medication such as paracetamol and ibuprofen. However, these medicines do not \"cure\" a fever and, as soon as the medication wears off, the temperature will increase again. This is normal and, if wanting to reduce the fever, then regular medication will need to be given.**\n\n### Fever in adults\n## How do you deal with a fever in adults?\n[Dr Sarah Jarvis MBE, FRCGP](https:\/\/patient.info\/authors\/dr-sarah-jarvis-mbe)\n\nA high temperature (fever) is usually associated with physical discomfort and most people feel better when a fever is treated. However, depending on age, physical condition and the underlying cause of the fever, it may be best not to treat the fever.\n\nMany experts believe that fever helps the body fight off infections naturally.. There is some evidence that fever reduces the severity of infections and helps faster recovery. However, paracetamol and ibuprofen will both reduce the fever if needed. It is important to drink plenty of fluids to avoid becoming dehydrated from sweating.\n\nIf there is an obvious cause for the fever, for example a flu-like illness with aches and pains and headaches, then treating the symptoms with paracetamol or ibuprofen will also help the underlying fever. If there is a bacterial infection, for example a urine infection, then antibiotics will be needed to treat the infection but these will not reduce the fever itself.\n\nTests may sometimes be needed if there is no obvious cause for the fever.\n\nTesting may include:\n\n- [Blood tests](https:\/\/patient.info\/treatment-medication\/blood-tests).\n- [Urine tests](https:\/\/patient.info\/mens-health\/urine-infection-in-men\/midstream-specimen-of-urine-msu).\n- [X-rays to determine the cause](https:\/\/patient.info\/treatment-medication\/x-ray-test).\n### Fever in children\n## How do you deal with a fever in children?\n[Dr Sarah Jarvis MBE, FRCGP](https:\/\/patient.info\/authors\/dr-sarah-jarvis-mbe)\n\nIn children, paracetamol and ibuprofen are only recommended if the child is distressed with the fever.\n\nWarm (tepid) sponging is no longer recommended for children to treat a fever. Drinking plenty of fluids is very important during a fever. Keeping fluid levels up is important to reduce the risk of dehydration. It is also important to make sure they are not wearing too many clothes - one layer is fine.\n\n**Note**: in children, giving paracetamol or ibuprofen does not reduce the risk of a seizure caused by a fever occurring. [See the separate leaflet called Febrile seizure (Febrile convulsion)](https:\/\/patient.info\/childrens-health\/fever-in-children-high-temperature\/febrile-seizure-febrile-convulsion).\n\n## When should you see a doctor about a fever?\nYou should contact a doctor if there is a high temperature (fever) and:\n\n- A child is under 3 months of age.\n- A child is 3-6 months of age with a fever of 39 degrees or more.\n- A child has a fit.\n- There is a rash that does not disappear when pressing a glass on it (a non-blanching rash), This is a potential medical emergency that requires attendance at an emergency department.\n- The person with the fever is becoming more unwell, for example with shortness of breath or chest pain.\n- A fever lasts longer than five days.\n- There is no obvious cause of the fever - for example, no cough or cold symptoms.\n- There may be a bacterial infection causing of the fever - for example, a urinary tract infection or a red hot swollen joint.\n\n**Note: Fever itself is not harmful. Many people think they need to seek medical advice when a temperature reaches, for example, 39 degrees in a toddler. If there is an obvious cause for the temperature (for example, a cold with a runny nose) then medical advice does not need to be sought just because of the height of the temperature. This advice is different for babies under 6 months of age.**\n\n## Frequently asked questions\n[Back to contents](https:\/\/patient.info\/signs-symptoms\/fever#toc)\n### What are the types of fever?\nCommon types include continuous fever, where the temperature stays high with little variation, intermittent fever, where it comes and goes, and remittent fever, where it rises and falls but never fully returns to normal.\n\n### What is a fever dream?\nA fever dream is a vivid or unsettling dream that happens when you have a fever. The changes in brain activity and sleep patterns can make your dreams feel more intense, strange, or even frightening. They usually pass once the fever settles.\n\n#### Patient picks for Fever\n[![Fever in children](https:\/\/patient.info\/images\/default_image.png)Signs and symptoms Fever in children A fever occurs when the body temperature is higher than normal. Normal body temperature varies a little, but a temperature above 38°C is considered a fever. Sometimes the upper range of normal is considered to be 37.5°C or 37.8°C - for consistency, this article will use 38°C as the cut-off for a high temperature. This article is specifically regarding fever in children. by Dr Philippa Vincent, MRCGP](https:\/\/patient.info\/childrens-health\/fever-in-children-high-temperature)\n\n[![Rigors](https:\/\/patient.info\/images\/default_image.png)Signs and symptoms Rigors Rigors are episodes in which your temperature rises - often quite quickly - whilst you have severe shivering accompanied by a feeling of coldness ('the chills'). The fever may be quite high and the shivering may be quite dramatic. by Dr Toni Hazell, MRCGP](https:\/\/patient.info\/childrens-health\/rigors-leaflet)\n\n### Further reading and references\n- [Fever in under 5s: assessment and initial management](https:\/\/www.nice.org.uk\/guidance\/ng143)\n  ; NICE Guidance (last updated November 2021)\n- [Feverish children - risk assessment and management](https:\/\/cks.nice.org.uk\/topics\/feverish-children-risk-assessment-management\/)\n  ; NICE CKS, June 2023 (UK access only)\n- [Fever and High Temperatures](https:\/\/www.alderhey.nhs.uk\/conditions\/symptoms-checker\/fever-high-temperature\/)\n  ; Alder Hey Hospital\n- [Fever in the Elderly](https:\/\/academic.oup.com\/cid\/article\/31\/1\/148\/318030?login=false)\n  ; Norman\n\n## Article history\nThe information on this page is written and peer reviewed by qualified clinicians.\n\n- ###### Next review due: 7 Sept 2027\n- ###### 8 Sept 2024 \\| Latest version\n  Last updated by\n  \n  [Dr Colin Tidy, MRCGP](https:\/\/patient.info\/authors\/dr-colin-tidy)\n  \n  Peer reviewed by\n  \n  [Dr Hayley Willacy, FRCGP](https:\/\/patient.info\/authors\/dr-hayley-willacy)\n\n## Join the conversation\nShare your thoughts or experiences with others in our [patient communities.](https:\/\/community.patient.info\/)\n\n**Disclaimer:** The views expressed in the community do not represent medical advice. For any health concerns, consult your GP or healthcare provider.\n\n![flu eligibility checker](https:\/\/images.ctfassets.net\/xxv4b9mbhlgd\/67ZL1sw5SwXVH5pETgnbmd\/00adebe6fc9061807a7a9a14f77bcd68\/Untitled_design-24.png)\n\n#### Ask, share, connect.\nBrowse discussions, ask questions, and share experiences across hundreds of health topics.\n\nBrowse forums\n\n![symptom checker](https:\/\/images.ctfassets.net\/xxv4b9mbhlgd\/4YO2oGN3nTyecJaazD5OMM\/a915fdc3dae8d6afe9c93dcfa4c2cfcf\/Desktop.png)\n\n#### Feeling unwell?\nAssess your symptoms online with our free symptom checker\n\nCheck symptoms\n\n#### Sign up to the Patient newsletter\nYour weekly dose of clear, trustworthy health advice - written to help you feel informed, confident and in control.\n\nBy subscribing you accept our [Privacy Policy](https:\/\/patient.info\/privacy-policy). You can unsubscribe at any time. We never sell your data.\n\nOur clinical information meets the standards set by the NHS in their Standard for Creating Health Content guidance.  \n[Read our editorial policy.](https:\/\/patient.info\/editorial-policy)\n\n## Download the Patient app\nFollow us\n\nPatient\n\n[Subscribe to health updates](https:\/\/patient.info\/newsletter)[About us](https:\/\/patient.info\/about-us)[Advertise with us](https:\/\/patient.info\/commercial-opportunities)[Partnerships and collaboration](https:\/\/patient.info\/partnerships)[Authors](https:\/\/patient.info\/authors)[RSS feeds](https:\/\/patient.info\/rss-feeds)[International sites](https:\/\/patient.info\/language)[Contact us](https:\/\/patient.info\/contact-us)\n\nLegal\n\n[Accessibility statement](https:\/\/patient.info\/accessibility-statement)[Cookie policy](https:\/\/patient.info\/cookies)[Privacy policy](https:\/\/patient.info\/privacy-policy)[Terms of use](https:\/\/patient.info\/terms-and-conditions)[Editorial policy](https:\/\/patient.info\/editorial-policy)[Affiliate policy](https:\/\/patient.info\/affiliate-links)\n\nFollow us\n\n**Disclosure:** Some of the links in this article are affiliate links. If you click on a link and make a purchase, Patient.info may earn a small commission at no additional cost to you. This does not influence our editorial content or medical recommendations. [Read more about how we fund our work.](https:\/\/patient.info\/affiliate-links)\n\nPatient is a part of [![Navigate Health](https:\/\/patient.info\/logo-navigate-health.svg)](https:\/\/www.navigatehealth.co.uk\/)\n\n© 2026 Navigate Health Ltd. All rights reserved.  \n Registered number: 16229589  \n Registered office: 128 City Road, London, United Kingdom, EC1V 2NX.\n\nPatient is a UK registered trade mark.\n\nPatient does not provide medical advice, diagnosis or treatment.","attrs_readable_markdown":"## Key points\n- Fever is a body temperature that is above 38°C (100.4°F), most often caused by viral or bacterial infections, but can be a sign of something more serious.\n- Common signs include increased temperature, chills, sweating, headache, fatigue, and muscle aches.\n- You can check if you have a high temperature by feeling if your chest and back are hotter than normal or by using a digital thermometer.\n- Treatment includes getting plenty of rest, drinking fluids, and taking paracetamol or ibuprofen to ease discomfort.\n- You should see a doctor immediately if you still have a high temperature after trying treatments at home.\n\nBody temperature fluctuates slightly throughout the day. Normal temperature varies depending on the person, the body site where temperature is measured, and the time of day. A temperature above the normal range is known as a fever (or pyrexia).\n\nWhat is a fever?\n\nIt is usually agreed that a person with a temperature of 38 degrees (38°C) or higher has a fever. However, a temperature over 37.5°C can be considered to be a mild or low grade fever. Fevers occur in both children and adults and are very common, particularly in children. Fevers are often accompanied by sweating. Also see [Fever in children](https:\/\/patient.info\/childrens-health\/fever-in-children-high-temperature).\n\nThe normal body temperature changes throughout the day. These changes can be caused by exercise, eating, sleeping and even the time of day. The temperature is usually highest in the early evening and lowest in the early hours of the morning.\n\nThe average body temperature, taken with a digital thermometer in your mouth (oral temperature), is 37°C (98.6°F), but anywhere between 36.5°C (97.7°F) and 37.2°C (98.96°F) is considered normal. Armpit temperatures tend to be 0.2°C to 0.3°C lower than this.\n\nHigh temperature (fever) is caused by the release of certain chemicals by the immune system, usually as a result of infection or inflammation.\n\nMost fevers are caused by infections or other illnesses. Viral infections are the commonest causes of a fever. The high body temperature makes it more difficult for the germs (bacteria or viruses) which cause infections to survive.\n\n### Fever caused by infections\nCommon conditions that can cause fevers include:\n\n- **Respiratory tract infections and colds**: [see the separate leaflet called Common cold (Upper respiratory tract infections)](https:\/\/patient.info\/chest-lungs\/cough-leaflet\/common-cold-upper-respiratory-tract-infections).\n- **Flu (influenza)**: [see the separate leaflet called Flu](https:\/\/patient.info\/infections\/influenza-and-flu-like-illness).\n- **Infection of the gut (gastroenteritis)**: see the separate leaflets called [Gastroenteritis in children](https:\/\/patient.info\/childrens-health\/acute-diarrhoea-in-children\/gastroenteritis-in-children) and [Gastroenteritis](https:\/\/patient.info\/digestive-health\/diarrhoea\/gastroenteritis).\n- **Ear infections**: [see the separate leaflet called Ear infection (Otitis media)](https:\/\/patient.info\/ears-nose-throat-mouth\/earache-ear-pain\/ear-infection-otitis-media).\n- **Infection of the tonsils**: [see the separate leaflet called Tonsillitis](https:\/\/patient.info\/ears-nose-throat-mouth\/sore-throat-2\/tonsillitis).\n- **Kidney or urinary tract infections**: see the separate leaflets called [Urine infection in children](https:\/\/patient.info\/document\/urine-infection-in-children), [Cystitis in women](https:\/\/patient.info\/womens-health\/lower-urinary-tract-symptoms-in-women-luts\/cystitis-in-women), [Urine infection in pregnancy](https:\/\/patient.info\/pregnancy\/pregnancy-complications\/urine-infection-in-pregnancy), [Urine infection in men](https:\/\/patient.info\/mens-health\/urine-infection-in-men), [Kidney infection (Pyelonephritis)](https:\/\/patient.info\/kidney-urinary-tract\/kidney-infection-pyelonephritis) and [What do kidneys do?](https:\/\/patient.info\/features\/kidney-urinary-tract\/what-do-kidneys-do)\n- **Common childhood illnesses**: for example, chickenpox (varicella), scarlet fever, rubella and whooping cough (pertussis). See the separate leaflets called [Chickenpox in children](https:\/\/patient.info\/skin-conditions\/viral-rashes\/chickenpox-in-children), [Scarlet fever](https:\/\/patient.info\/skin-conditions\/viral-rashes\/scarlet-fever), and [Whooping cough](https:\/\/patient.info\/infections\/whooping-cough).\n\nIf developing a fever after having been abroad, it is important to seek medical advice. Certain infections that can be caught abroad (such as [Malaria](https:\/\/patient.info\/travel-and-vaccinations\/malaria-leaflet), typhoid or yellow fever) can cause a fever.\n\nA child's temperature can also be raised when their teeth start to develop (their teething period), following some vaccinations, or if overheating because of too much bedding or clothing. See the separate leaflets called [Teething](https:\/\/patient.info\/childrens-health\/teething), [Immunisation](https:\/\/patient.info\/childrens-health\/immunisation) and [Cot death](https:\/\/patient.info\/childrens-health\/sudden-infant-death-cot-death).\n\n### Fever caused by other conditions\nFever can be caused by conditions other than infections but this is less common. For example, blood clots in the leg or lung can occasionally lead to a fever developing. See the separate leaflets called [Deep vein thrombosis](https:\/\/patient.info\/allergies-blood-immune\/deep-vein-thrombosis-leaflet) and [Pulmonary embolism](https:\/\/patient.info\/signs-symptoms\/breathlessness-and-breathing-difficulties-dyspnoea\/pulmonary-embolism).\n\nThere are some health conditions that cause inflammation in the body and these can also cause fevers at times. See the separate leaflets called [Rheumatoid arthritis](https:\/\/patient.info\/bones-joints-muscles\/rheumatoid-arthritis-leaflet) and [Systemic lupus erythematosus](https:\/\/patient.info\/skin-conditions\/lupus-systemic-lupus-erythematosus).\n\nThere are also some types of cancer which can lead to a fever developing. [See the separate leaflet called Cancer](https:\/\/patient.info\/cancer\/cancer).\n\nSometimes the cause of the fever is not clear. This is called a fever of unknown origin.\n\nA high temperature (fever) is very common, particularly in children. Around 3 out of 10 young children have a fever every year. Older adults are less likely to develop a high temperature when they get an infection; however, older adults who do develop a fever with an infection have been shown to be more likely to recover quickly.\n\nThere are different ways of taking a temperature with a thermometer. A thermometer can be placed either under your armpit or in your ear. The forehead thermometers are no longer recommended as they are less accurate. Rectal thermometers are no longer usually used in the UK.\n\nAs a parent it can feel worrying if a child has a high temperature (fever). However, having a fever is very common and usually settles by itself without treatment.\n\n### Signs of fever\nUsing a thermometer is the best way to tell if there is a fever. However the following will give a rough idea:\n\n- The forehead may feel hot when felt with the back of the hand. This is much more sensitive to temperature than the palm.\n- Cheeks may be flushed.\n- Feeling hotter than others around.\n\n**Note: Fever usually responds well to medication such as paracetamol and ibuprofen. However, these medicines do not \"cure\" a fever and, as soon as the medication wears off, the temperature will increase again. This is normal and, if wanting to reduce the fever, then regular medication will need to be given.**\n\n### Fever in adults\nHow do you deal with a fever in adults?\n\nA high temperature (fever) is usually associated with physical discomfort and most people feel better when a fever is treated. However, depending on age, physical condition and the underlying cause of the fever, it may be best not to treat the fever.\n\nMany experts believe that fever helps the body fight off infections naturally.. There is some evidence that fever reduces the severity of infections and helps faster recovery. However, paracetamol and ibuprofen will both reduce the fever if needed. It is important to drink plenty of fluids to avoid becoming dehydrated from sweating.\n\nIf there is an obvious cause for the fever, for example a flu-like illness with aches and pains and headaches, then treating the symptoms with paracetamol or ibuprofen will also help the underlying fever. If there is a bacterial infection, for example a urine infection, then antibiotics will be needed to treat the infection but these will not reduce the fever itself.\n\nTests may sometimes be needed if there is no obvious cause for the fever.\n\nTesting may include:\n\n- [Blood tests](https:\/\/patient.info\/treatment-medication\/blood-tests).\n- [Urine tests](https:\/\/patient.info\/mens-health\/urine-infection-in-men\/midstream-specimen-of-urine-msu).\n- [X-rays to determine the cause](https:\/\/patient.info\/treatment-medication\/x-ray-test).\n### Fever in children\nHow do you deal with a fever in children?\n\nIn children, paracetamol and ibuprofen are only recommended if the child is distressed with the fever.\n\nWarm (tepid) sponging is no longer recommended for children to treat a fever. Drinking plenty of fluids is very important during a fever. Keeping fluid levels up is important to reduce the risk of dehydration. It is also important to make sure they are not wearing too many clothes - one layer is fine.\n\n**Note**: in children, giving paracetamol or ibuprofen does not reduce the risk of a seizure caused by a fever occurring. [See the separate leaflet called Febrile seizure (Febrile convulsion)](https:\/\/patient.info\/childrens-health\/fever-in-children-high-temperature\/febrile-seizure-febrile-convulsion).\n\n## When should you see a doctor about a fever?\nYou should contact a doctor if there is a high temperature (fever) and:\n\n- A child is under 3 months of age.\n- A child is 3-6 months of age with a fever of 39 degrees or more.\n- A child has a fit.\n- There is a rash that does not disappear when pressing a glass on it (a non-blanching rash), This is a potential medical emergency that requires attendance at an emergency department.\n- The person with the fever is becoming more unwell, for example with shortness of breath or chest pain.\n- A fever lasts longer than five days.\n- There is no obvious cause of the fever - for example, no cough or cold symptoms.\n- There may be a bacterial infection causing of the fever - for example, a urinary tract infection or a red hot swollen joint.\n\n**Note: Fever itself is not harmful. Many people think they need to seek medical advice when a temperature reaches, for example, 39 degrees in a toddler. If there is an obvious cause for the temperature (for example, a cold with a runny nose) then medical advice does not need to be sought just because of the height of the temperature. This advice is different for babies under 6 months of age.**\n### What are the types of fever?\nCommon types include continuous fever, where the temperature stays high with little variation, intermittent fever, where it comes and goes, and remittent fever, where it rises and falls but never fully returns to normal.\n\n### What is a fever dream?\nA fever dream is a vivid or unsettling dream that happens when you have a fever. The changes in brain activity and sleep patterns can make your dreams feel more intense, strange, or even frightening. They usually pass once the fever settles.\n\n## Article history\nThe information on this page is written and peer reviewed by qualified clinicians.\n\n- Next review due: 7 Sept 2027\n- ###### 8 Sept 2024 \\| Latest version","meta_canonical":null}

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Boilerpipe Text	Key points Fever is a body temperature that is above 38°C (100.4°F), most often caused by viral or bacterial infections, but can be a sign of something more serious. Common signs include increased temperature, chills, sweating, headache, fatigue, and muscle aches. You can check if you have a high temperature by feeling if your chest and back are hotter than normal or by using a digital thermometer. Treatment includes getting plenty of rest, drinking fluids, and taking paracetamol or ibuprofen to ease discomfort. You should see a doctor immediately if you still have a high temperature after trying treatments at home. Body temperature fluctuates slightly throughout the day. Normal temperature varies depending on the person, the body site where temperature is measured, and the time of day. A temperature above the normal range is known as a fever (or pyrexia). What is a fever? It is usually agreed that a person with a temperature of 38 degrees (38°C) or higher has a fever. However, a temperature over 37.5°C can be considered to be a mild or low grade fever. Fevers occur in both children and adults and are very common, particularly in children. Fevers are often accompanied by sweating. Also see Fever in children . The normal body temperature changes throughout the day. These changes can be caused by exercise, eating, sleeping and even the time of day. The temperature is usually highest in the early evening and lowest in the early hours of the morning. The average body temperature, taken with a digital thermometer in your mouth (oral temperature), is 37°C (98.6°F), but anywhere between 36.5°C (97.7°F) and 37.2°C (98.96°F) is considered normal. Armpit temperatures tend to be 0.2°C to 0.3°C lower than this. High temperature (fever) is caused by the release of certain chemicals by the immune system, usually as a result of infection or inflammation. Most fevers are caused by infections or other illnesses. Viral infections are the commonest causes of a fever. The high body temperature makes it more difficult for the germs (bacteria or viruses) which cause infections to survive. Fever caused by infections Common conditions that can cause fevers include: Respiratory tract infections and colds : see the separate leaflet called Common cold (Upper respiratory tract infections) . Flu (influenza) : see the separate leaflet called Flu . Infection of the gut (gastroenteritis) : see the separate leaflets called Gastroenteritis in children and Gastroenteritis . Ear infections : see the separate leaflet called Ear infection (Otitis media) . Infection of the tonsils : see the separate leaflet called Tonsillitis . Kidney or urinary tract infections : see the separate leaflets called Urine infection in children , Cystitis in women , Urine infection in pregnancy , Urine infection in men , Kidney infection (Pyelonephritis) and What do kidneys do? Common childhood illnesses : for example, chickenpox (varicella), scarlet fever, rubella and whooping cough (pertussis). See the separate leaflets called Chickenpox in children , Scarlet fever , and Whooping cough . If developing a fever after having been abroad, it is important to seek medical advice. Certain infections that can be caught abroad (such as Malaria , typhoid or yellow fever) can cause a fever. A child's temperature can also be raised when their teeth start to develop (their teething period), following some vaccinations, or if overheating because of too much bedding or clothing. See the separate leaflets called Teething , Immunisation and Cot death . Fever caused by other conditions Fever can be caused by conditions other than infections but this is less common. For example, blood clots in the leg or lung can occasionally lead to a fever developing. See the separate leaflets called Deep vein thrombosis and Pulmonary embolism . There are some health conditions that cause inflammation in the body and these can also cause fevers at times. See the separate leaflets called Rheumatoid arthritis and Systemic lupus erythematosus . There are also some types of cancer which can lead to a fever developing. See the separate leaflet called Cancer . Sometimes the cause of the fever is not clear. This is called a fever of unknown origin. A high temperature (fever) is very common, particularly in children. Around 3 out of 10 young children have a fever every year. Older adults are less likely to develop a high temperature when they get an infection; however, older adults who do develop a fever with an infection have been shown to be more likely to recover quickly. There are different ways of taking a temperature with a thermometer. A thermometer can be placed either under your armpit or in your ear. The forehead thermometers are no longer recommended as they are less accurate. Rectal thermometers are no longer usually used in the UK. As a parent it can feel worrying if a child has a high temperature (fever). However, having a fever is very common and usually settles by itself without treatment. Signs of fever Using a thermometer is the best way to tell if there is a fever. However the following will give a rough idea: The forehead may feel hot when felt with the back of the hand. This is much more sensitive to temperature than the palm. Cheeks may be flushed. Feeling hotter than others around. Note: Fever usually responds well to medication such as paracetamol and ibuprofen. However, these medicines do not "cure" a fever and, as soon as the medication wears off, the temperature will increase again. This is normal and, if wanting to reduce the fever, then regular medication will need to be given. Fever in adults How do you deal with a fever in adults? A high temperature (fever) is usually associated with physical discomfort and most people feel better when a fever is treated. However, depending on age, physical condition and the underlying cause of the fever, it may be best not to treat the fever. Many experts believe that fever helps the body fight off infections naturally.. There is some evidence that fever reduces the severity of infections and helps faster recovery. However, paracetamol and ibuprofen will both reduce the fever if needed. It is important to drink plenty of fluids to avoid becoming dehydrated from sweating. If there is an obvious cause for the fever, for example a flu-like illness with aches and pains and headaches, then treating the symptoms with paracetamol or ibuprofen will also help the underlying fever. If there is a bacterial infection, for example a urine infection, then antibiotics will be needed to treat the infection but these will not reduce the fever itself. Tests may sometimes be needed if there is no obvious cause for the fever. Testing may include: Blood tests . Urine tests . X-rays to determine the cause . Fever in children How do you deal with a fever in children? In children, paracetamol and ibuprofen are only recommended if the child is distressed with the fever. Warm (tepid) sponging is no longer recommended for children to treat a fever. Drinking plenty of fluids is very important during a fever. Keeping fluid levels up is important to reduce the risk of dehydration. It is also important to make sure they are not wearing too many clothes - one layer is fine. Note : in children, giving paracetamol or ibuprofen does not reduce the risk of a seizure caused by a fever occurring. See the separate leaflet called Febrile seizure (Febrile convulsion) . When should you see a doctor about a fever? You should contact a doctor if there is a high temperature (fever) and: A child is under 3 months of age. A child is 3-6 months of age with a fever of 39 degrees or more. A child has a fit. There is a rash that does not disappear when pressing a glass on it (a non-blanching rash), This is a potential medical emergency that requires attendance at an emergency department. The person with the fever is becoming more unwell, for example with shortness of breath or chest pain. A fever lasts longer than five days. There is no obvious cause of the fever - for example, no cough or cold symptoms. There may be a bacterial infection causing of the fever - for example, a urinary tract infection or a red hot swollen joint. Note: Fever itself is not harmful. Many people think they need to seek medical advice when a temperature reaches, for example, 39 degrees in a toddler. If there is an obvious cause for the temperature (for example, a cold with a runny nose) then medical advice does not need to be sought just because of the height of the temperature. This advice is different for babies under 6 months of age. What are the types of fever? Common types include continuous fever, where the temperature stays high with little variation, intermittent fever, where it comes and goes, and remittent fever, where it rises and falls but never fully returns to normal. What is a fever dream? A fever dream is a vivid or unsettling dream that happens when you have a fever. The changes in brain activity and sleep patterns can make your dreams feel more intense, strange, or even frightening. They usually pass once the fever settles. Article history The information on this page is written and peer reviewed by qualified clinicians. Next review due: 7 Sept 2027 8 Sept 2024 \| Latest version
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Download [Download](https://pdf.patient.info/?url=https%3A%2F%2Fpatient.info%2Fsigns-symptoms%2Ffever) Article PDF has been downloaded - Share #### Share - [Share via email](mailto:?subject=Patient%20-%20Fever&body=https%3A%2F%2Fpatient.info%2Fsigns-symptoms%2Ffever) - [Share via Facebook](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Fpatient.info%2Fsigns-symptoms%2Ffever) - [Share via LinkedIn](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Fpatient.info%2Fsigns-symptoms%2Ffever) - [Share via X](https://x.com/intent/post?text=Patient%20-%20Fever&url=https%3A%2F%2Fpatient.info%2Fsigns-symptoms%2Ffever) - [Share via WhatsApp](https://api.whatsapp.com/send?text=Patient%20-%20Fever%20https%3A%2F%2Fpatient.info%2Fsigns-symptoms%2Ffever) - [Copy link](https://patient.info/signs-symptoms/fever#copy) Article link copied to clipboard - Language #### Language - [English](https://patient.info/signs-symptoms/fever) - [Deutsch](https://de.patient.info/signs-symptoms/fever) - [Español](https://es.patient.info/signs-symptoms/fever) - [Français](https://fr.patient.info/signs-symptoms/fever) - [Italiano](https://it.patient.info/signs-symptoms/fever) - [Português](https://pt.patient.info/signs-symptoms/fever) - Discussion - Audio Version A fever, also known as a high temperature or high fever, is when your body temperature temporarily rises above 38°C (100.4°F). Fever itself is not an illness and is usually a symptom of an underlying condition, such as an infection. This leaflet explains the what causes a fever, signs you have a fever, and when you should see a doctor. ### In this article: - [What is a fever?](https://patient.info/signs-symptoms/fever#what-is-a-fever) - [What temperature is a fever?](https://patient.info/signs-symptoms/fever#what-temperature-is-a-fever) - [What is a normal temperature?](https://patient.info/signs-symptoms/fever#what-is-a-normal-temperature) - [What causes a fever?](https://patient.info/signs-symptoms/fever#what-causes-a-fever) - [How common is a fever?](https://patient.info/signs-symptoms/fever#how-common-is-a-fever) - [How do I take my temperature?](https://patient.info/signs-symptoms/fever#how-do-i-take-my-temperature) - [How to reduce a fever](https://patient.info/signs-symptoms/fever#how-to-reduce-a-fever) - [Frequently asked questions](https://patient.info/signs-symptoms/fever#frequently-asked-questions) - [Further reading and references](https://patient.info/signs-symptoms/fever#furtherreading) #### Video picks for Fever ## Key points - Fever is a body temperature that is above 38°C (100.4°F), most often caused by viral or bacterial infections, but can be a sign of something more serious. - Common signs include increased temperature, chills, sweating, headache, fatigue, and muscle aches. - You can check if you have a high temperature by feeling if your chest and back are hotter than normal or by using a digital thermometer. - Treatment includes getting plenty of rest, drinking fluids, and taking paracetamol or ibuprofen to ease discomfort. - You should see a doctor immediately if you still have a high temperature after trying treatments at home. ## What is a fever? Body temperature fluctuates slightly throughout the day. Normal temperature varies depending on the person, the body site where temperature is measured, and the time of day. A temperature above the normal range is known as a fever (or pyrexia). ## What is a fever? [Dr Sarah Jarvis MBE, FRCGP](https://patient.info/authors/dr-sarah-jarvis-mbe) ## What temperature is a fever? [Back to contents](https://patient.info/signs-symptoms/fever#toc) It is usually agreed that a person with a temperature of 38 degrees (38°C) or higher has a fever. However, a temperature over 37.5°C can be considered to be a mild or low grade fever. Fevers occur in both children and adults and are very common, particularly in children. Fevers are often accompanied by sweating. Also see [Fever in children](https://patient.info/childrens-health/fever-in-children-high-temperature). ## What is a normal temperature? [Back to contents](https://patient.info/signs-symptoms/fever#toc) The normal body temperature changes throughout the day. These changes can be caused by exercise, eating, sleeping and even the time of day. The temperature is usually highest in the early evening and lowest in the early hours of the morning. The average body temperature, taken with a digital thermometer in your mouth (oral temperature), is 37°C (98.6°F), but anywhere between 36.5°C (97.7°F) and 37.2°C (98.96°F) is considered normal. Armpit temperatures tend to be 0.2°C to 0.3°C lower than this. ## What causes a fever? [Back to contents](https://patient.info/signs-symptoms/fever#toc) High temperature (fever) is caused by the release of certain chemicals by the immune system, usually as a result of infection or inflammation. Most fevers are caused by infections or other illnesses. Viral infections are the commonest causes of a fever. The high body temperature makes it more difficult for the germs (bacteria or viruses) which cause infections to survive. ### Fever caused by infections Common conditions that can cause fevers include: - Respiratory tract infections and colds: [see the separate leaflet called Common cold (Upper respiratory tract infections)](https://patient.info/chest-lungs/cough-leaflet/common-cold-upper-respiratory-tract-infections). - Flu (influenza): [see the separate leaflet called Flu](https://patient.info/infections/influenza-and-flu-like-illness). - Infection of the gut (gastroenteritis): see the separate leaflets called [Gastroenteritis in children](https://patient.info/childrens-health/acute-diarrhoea-in-children/gastroenteritis-in-children) and [Gastroenteritis](https://patient.info/digestive-health/diarrhoea/gastroenteritis). - Ear infections: [see the separate leaflet called Ear infection (Otitis media)](https://patient.info/ears-nose-throat-mouth/earache-ear-pain/ear-infection-otitis-media). - Infection of the tonsils: [see the separate leaflet called Tonsillitis](https://patient.info/ears-nose-throat-mouth/sore-throat-2/tonsillitis). - Kidney or urinary tract infections: see the separate leaflets called [Urine infection in children](https://patient.info/document/urine-infection-in-children), [Cystitis in women](https://patient.info/womens-health/lower-urinary-tract-symptoms-in-women-luts/cystitis-in-women), [Urine infection in pregnancy](https://patient.info/pregnancy/pregnancy-complications/urine-infection-in-pregnancy), [Urine infection in men](https://patient.info/mens-health/urine-infection-in-men), [Kidney infection (Pyelonephritis)](https://patient.info/kidney-urinary-tract/kidney-infection-pyelonephritis) and [What do kidneys do?](https://patient.info/features/kidney-urinary-tract/what-do-kidneys-do) - Common childhood illnesses: for example, chickenpox (varicella), scarlet fever, rubella and whooping cough (pertussis). See the separate leaflets called [Chickenpox in children](https://patient.info/skin-conditions/viral-rashes/chickenpox-in-children), [Scarlet fever](https://patient.info/skin-conditions/viral-rashes/scarlet-fever), and [Whooping cough](https://patient.info/infections/whooping-cough). If developing a fever after having been abroad, it is important to seek medical advice. Certain infections that can be caught abroad (such as [Malaria](https://patient.info/travel-and-vaccinations/malaria-leaflet), typhoid or yellow fever) can cause a fever. A child's temperature can also be raised when their teeth start to develop (their teething period), following some vaccinations, or if overheating because of too much bedding or clothing. See the separate leaflets called [Teething](https://patient.info/childrens-health/teething), [Immunisation](https://patient.info/childrens-health/immunisation) and [Cot death](https://patient.info/childrens-health/sudden-infant-death-cot-death). ### Fever caused by other conditions Fever can be caused by conditions other than infections but this is less common. For example, blood clots in the leg or lung can occasionally lead to a fever developing. See the separate leaflets called [Deep vein thrombosis](https://patient.info/allergies-blood-immune/deep-vein-thrombosis-leaflet) and [Pulmonary embolism](https://patient.info/signs-symptoms/breathlessness-and-breathing-difficulties-dyspnoea/pulmonary-embolism). There are some health conditions that cause inflammation in the body and these can also cause fevers at times. See the separate leaflets called [Rheumatoid arthritis](https://patient.info/bones-joints-muscles/rheumatoid-arthritis-leaflet) and [Systemic lupus erythematosus](https://patient.info/skin-conditions/lupus-systemic-lupus-erythematosus). There are also some types of cancer which can lead to a fever developing. [See the separate leaflet called Cancer](https://patient.info/cancer/cancer). Sometimes the cause of the fever is not clear. This is called a fever of unknown origin. ## How common is a fever? [Back to contents](https://patient.info/signs-symptoms/fever#toc) A high temperature (fever) is very common, particularly in children. Around 3 out of 10 young children have a fever every year. Older adults are less likely to develop a high temperature when they get an infection; however, older adults who do develop a fever with an infection have been shown to be more likely to recover quickly. ## How do I take my temperature? [Back to contents](https://patient.info/signs-symptoms/fever#toc) There are different ways of taking a temperature with a thermometer. A thermometer can be placed either under your armpit or in your ear. The forehead thermometers are no longer recommended as they are less accurate. Rectal thermometers are no longer usually used in the UK. As a parent it can feel worrying if a child has a high temperature (fever). However, having a fever is very common and usually settles by itself without treatment. ### Signs of fever Using a thermometer is the best way to tell if there is a fever. However the following will give a rough idea: - The forehead may feel hot when felt with the back of the hand. This is much more sensitive to temperature than the palm. - Cheeks may be flushed. - Feeling hotter than others around. ## How to reduce a fever [Back to contents](https://patient.info/signs-symptoms/fever#toc) Note: Fever usually responds well to medication such as paracetamol and ibuprofen. However, these medicines do not "cure" a fever and, as soon as the medication wears off, the temperature will increase again. This is normal and, if wanting to reduce the fever, then regular medication will need to be given. ### Fever in adults ## How do you deal with a fever in adults? [Dr Sarah Jarvis MBE, FRCGP](https://patient.info/authors/dr-sarah-jarvis-mbe) A high temperature (fever) is usually associated with physical discomfort and most people feel better when a fever is treated. However, depending on age, physical condition and the underlying cause of the fever, it may be best not to treat the fever. Many experts believe that fever helps the body fight off infections naturally.. There is some evidence that fever reduces the severity of infections and helps faster recovery. However, paracetamol and ibuprofen will both reduce the fever if needed. It is important to drink plenty of fluids to avoid becoming dehydrated from sweating. If there is an obvious cause for the fever, for example a flu-like illness with aches and pains and headaches, then treating the symptoms with paracetamol or ibuprofen will also help the underlying fever. If there is a bacterial infection, for example a urine infection, then antibiotics will be needed to treat the infection but these will not reduce the fever itself. Tests may sometimes be needed if there is no obvious cause for the fever. Testing may include: - [Blood tests](https://patient.info/treatment-medication/blood-tests). - [Urine tests](https://patient.info/mens-health/urine-infection-in-men/midstream-specimen-of-urine-msu). - [X-rays to determine the cause](https://patient.info/treatment-medication/x-ray-test). ### Fever in children ## How do you deal with a fever in children? [Dr Sarah Jarvis MBE, FRCGP](https://patient.info/authors/dr-sarah-jarvis-mbe) In children, paracetamol and ibuprofen are only recommended if the child is distressed with the fever. Warm (tepid) sponging is no longer recommended for children to treat a fever. Drinking plenty of fluids is very important during a fever. Keeping fluid levels up is important to reduce the risk of dehydration. It is also important to make sure they are not wearing too many clothes - one layer is fine. Note: in children, giving paracetamol or ibuprofen does not reduce the risk of a seizure caused by a fever occurring. [See the separate leaflet called Febrile seizure (Febrile convulsion)](https://patient.info/childrens-health/fever-in-children-high-temperature/febrile-seizure-febrile-convulsion). ## When should you see a doctor about a fever? You should contact a doctor if there is a high temperature (fever) and: - A child is under 3 months of age. - A child is 3-6 months of age with a fever of 39 degrees or more. - A child has a fit. - There is a rash that does not disappear when pressing a glass on it (a non-blanching rash), This is a potential medical emergency that requires attendance at an emergency department. - The person with the fever is becoming more unwell, for example with shortness of breath or chest pain. - A fever lasts longer than five days. - There is no obvious cause of the fever - for example, no cough or cold symptoms. - There may be a bacterial infection causing of the fever - for example, a urinary tract infection or a red hot swollen joint. Note: Fever itself is not harmful. Many people think they need to seek medical advice when a temperature reaches, for example, 39 degrees in a toddler. If there is an obvious cause for the temperature (for example, a cold with a runny nose) then medical advice does not need to be sought just because of the height of the temperature. This advice is different for babies under 6 months of age. ## Frequently asked questions [Back to contents](https://patient.info/signs-symptoms/fever#toc) ### What are the types of fever? Common types include continuous fever, where the temperature stays high with little variation, intermittent fever, where it comes and goes, and remittent fever, where it rises and falls but never fully returns to normal. ### What is a fever dream? A fever dream is a vivid or unsettling dream that happens when you have a fever. The changes in brain activity and sleep patterns can make your dreams feel more intense, strange, or even frightening. They usually pass once the fever settles. #### Patient picks for Fever [![Fever in children](https://patient.info/images/default_image.png)Signs and symptoms Fever in children A fever occurs when the body temperature is higher than normal. Normal body temperature varies a little, but a temperature above 38°C is considered a fever. Sometimes the upper range of normal is considered to be 37.5°C or 37.8°C - for consistency, this article will use 38°C as the cut-off for a high temperature. This article is specifically regarding fever in children. by Dr Philippa Vincent, MRCGP](https://patient.info/childrens-health/fever-in-children-high-temperature) [![Rigors](https://patient.info/images/default_image.png)Signs and symptoms Rigors Rigors are episodes in which your temperature rises - often quite quickly - whilst you have severe shivering accompanied by a feeling of coldness ('the chills'). The fever may be quite high and the shivering may be quite dramatic. by Dr Toni Hazell, MRCGP](https://patient.info/childrens-health/rigors-leaflet) ### Further reading and references - [Fever in under 5s: assessment and initial management](https://www.nice.org.uk/guidance/ng143) ; NICE Guidance (last updated November 2021) - [Feverish children - risk assessment and management](https://cks.nice.org.uk/topics/feverish-children-risk-assessment-management/) ; NICE CKS, June 2023 (UK access only) - [Fever and High Temperatures](https://www.alderhey.nhs.uk/conditions/symptoms-checker/fever-high-temperature/) ; Alder Hey Hospital - [Fever in the Elderly](https://academic.oup.com/cid/article/31/1/148/318030?login=false) ; Norman ## Article history The information on this page is written and peer reviewed by qualified clinicians. - ###### Next review due: 7 Sept 2027 - ###### 8 Sept 2024 \\| Latest version Last updated by [Dr Colin Tidy, MRCGP](https://patient.info/authors/dr-colin-tidy) Peer reviewed by [Dr Hayley Willacy, FRCGP](https://patient.info/authors/dr-hayley-willacy) ## Join the conversation Share your thoughts or experiences with others in our [patient communities.](https://community.patient.info/) Disclaimer: The views expressed in the community do not represent medical advice. 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Readable Markdown	## Key points - Fever is a body temperature that is above 38°C (100.4°F), most often caused by viral or bacterial infections, but can be a sign of something more serious. - Common signs include increased temperature, chills, sweating, headache, fatigue, and muscle aches. - You can check if you have a high temperature by feeling if your chest and back are hotter than normal or by using a digital thermometer. - Treatment includes getting plenty of rest, drinking fluids, and taking paracetamol or ibuprofen to ease discomfort. - You should see a doctor immediately if you still have a high temperature after trying treatments at home. Body temperature fluctuates slightly throughout the day. Normal temperature varies depending on the person, the body site where temperature is measured, and the time of day. A temperature above the normal range is known as a fever (or pyrexia). What is a fever? It is usually agreed that a person with a temperature of 38 degrees (38°C) or higher has a fever. However, a temperature over 37.5°C can be considered to be a mild or low grade fever. Fevers occur in both children and adults and are very common, particularly in children. Fevers are often accompanied by sweating. Also see [Fever in children](https://patient.info/childrens-health/fever-in-children-high-temperature). The normal body temperature changes throughout the day. These changes can be caused by exercise, eating, sleeping and even the time of day. The temperature is usually highest in the early evening and lowest in the early hours of the morning. The average body temperature, taken with a digital thermometer in your mouth (oral temperature), is 37°C (98.6°F), but anywhere between 36.5°C (97.7°F) and 37.2°C (98.96°F) is considered normal. Armpit temperatures tend to be 0.2°C to 0.3°C lower than this. High temperature (fever) is caused by the release of certain chemicals by the immune system, usually as a result of infection or inflammation. Most fevers are caused by infections or other illnesses. Viral infections are the commonest causes of a fever. The high body temperature makes it more difficult for the germs (bacteria or viruses) which cause infections to survive. ### Fever caused by infections Common conditions that can cause fevers include: - Respiratory tract infections and colds: [see the separate leaflet called Common cold (Upper respiratory tract infections)](https://patient.info/chest-lungs/cough-leaflet/common-cold-upper-respiratory-tract-infections). - Flu (influenza): [see the separate leaflet called Flu](https://patient.info/infections/influenza-and-flu-like-illness). - Infection of the gut (gastroenteritis): see the separate leaflets called [Gastroenteritis in children](https://patient.info/childrens-health/acute-diarrhoea-in-children/gastroenteritis-in-children) and [Gastroenteritis](https://patient.info/digestive-health/diarrhoea/gastroenteritis). - Ear infections: [see the separate leaflet called Ear infection (Otitis media)](https://patient.info/ears-nose-throat-mouth/earache-ear-pain/ear-infection-otitis-media). - Infection of the tonsils: [see the separate leaflet called Tonsillitis](https://patient.info/ears-nose-throat-mouth/sore-throat-2/tonsillitis). - Kidney or urinary tract infections: see the separate leaflets called [Urine infection in children](https://patient.info/document/urine-infection-in-children), [Cystitis in women](https://patient.info/womens-health/lower-urinary-tract-symptoms-in-women-luts/cystitis-in-women), [Urine infection in pregnancy](https://patient.info/pregnancy/pregnancy-complications/urine-infection-in-pregnancy), [Urine infection in men](https://patient.info/mens-health/urine-infection-in-men), [Kidney infection (Pyelonephritis)](https://patient.info/kidney-urinary-tract/kidney-infection-pyelonephritis) and [What do kidneys do?](https://patient.info/features/kidney-urinary-tract/what-do-kidneys-do) - Common childhood illnesses: for example, chickenpox (varicella), scarlet fever, rubella and whooping cough (pertussis). See the separate leaflets called [Chickenpox in children](https://patient.info/skin-conditions/viral-rashes/chickenpox-in-children), [Scarlet fever](https://patient.info/skin-conditions/viral-rashes/scarlet-fever), and [Whooping cough](https://patient.info/infections/whooping-cough). If developing a fever after having been abroad, it is important to seek medical advice. Certain infections that can be caught abroad (such as [Malaria](https://patient.info/travel-and-vaccinations/malaria-leaflet), typhoid or yellow fever) can cause a fever. A child's temperature can also be raised when their teeth start to develop (their teething period), following some vaccinations, or if overheating because of too much bedding or clothing. See the separate leaflets called [Teething](https://patient.info/childrens-health/teething), [Immunisation](https://patient.info/childrens-health/immunisation) and [Cot death](https://patient.info/childrens-health/sudden-infant-death-cot-death). ### Fever caused by other conditions Fever can be caused by conditions other than infections but this is less common. For example, blood clots in the leg or lung can occasionally lead to a fever developing. See the separate leaflets called [Deep vein thrombosis](https://patient.info/allergies-blood-immune/deep-vein-thrombosis-leaflet) and [Pulmonary embolism](https://patient.info/signs-symptoms/breathlessness-and-breathing-difficulties-dyspnoea/pulmonary-embolism). There are some health conditions that cause inflammation in the body and these can also cause fevers at times. See the separate leaflets called [Rheumatoid arthritis](https://patient.info/bones-joints-muscles/rheumatoid-arthritis-leaflet) and [Systemic lupus erythematosus](https://patient.info/skin-conditions/lupus-systemic-lupus-erythematosus). There are also some types of cancer which can lead to a fever developing. [See the separate leaflet called Cancer](https://patient.info/cancer/cancer). Sometimes the cause of the fever is not clear. This is called a fever of unknown origin. A high temperature (fever) is very common, particularly in children. Around 3 out of 10 young children have a fever every year. Older adults are less likely to develop a high temperature when they get an infection; however, older adults who do develop a fever with an infection have been shown to be more likely to recover quickly. There are different ways of taking a temperature with a thermometer. A thermometer can be placed either under your armpit or in your ear. The forehead thermometers are no longer recommended as they are less accurate. Rectal thermometers are no longer usually used in the UK. As a parent it can feel worrying if a child has a high temperature (fever). However, having a fever is very common and usually settles by itself without treatment. ### Signs of fever Using a thermometer is the best way to tell if there is a fever. However the following will give a rough idea: - The forehead may feel hot when felt with the back of the hand. This is much more sensitive to temperature than the palm. - Cheeks may be flushed. - Feeling hotter than others around. Note: Fever usually responds well to medication such as paracetamol and ibuprofen. However, these medicines do not "cure" a fever and, as soon as the medication wears off, the temperature will increase again. This is normal and, if wanting to reduce the fever, then regular medication will need to be given. ### Fever in adults How do you deal with a fever in adults? A high temperature (fever) is usually associated with physical discomfort and most people feel better when a fever is treated. However, depending on age, physical condition and the underlying cause of the fever, it may be best not to treat the fever. Many experts believe that fever helps the body fight off infections naturally.. There is some evidence that fever reduces the severity of infections and helps faster recovery. However, paracetamol and ibuprofen will both reduce the fever if needed. It is important to drink plenty of fluids to avoid becoming dehydrated from sweating. If there is an obvious cause for the fever, for example a flu-like illness with aches and pains and headaches, then treating the symptoms with paracetamol or ibuprofen will also help the underlying fever. If there is a bacterial infection, for example a urine infection, then antibiotics will be needed to treat the infection but these will not reduce the fever itself. Tests may sometimes be needed if there is no obvious cause for the fever. Testing may include: - [Blood tests](https://patient.info/treatment-medication/blood-tests). - [Urine tests](https://patient.info/mens-health/urine-infection-in-men/midstream-specimen-of-urine-msu). - [X-rays to determine the cause](https://patient.info/treatment-medication/x-ray-test). ### Fever in children How do you deal with a fever in children? In children, paracetamol and ibuprofen are only recommended if the child is distressed with the fever. Warm (tepid) sponging is no longer recommended for children to treat a fever. Drinking plenty of fluids is very important during a fever. Keeping fluid levels up is important to reduce the risk of dehydration. It is also important to make sure they are not wearing too many clothes - one layer is fine. Note: in children, giving paracetamol or ibuprofen does not reduce the risk of a seizure caused by a fever occurring. [See the separate leaflet called Febrile seizure (Febrile convulsion)](https://patient.info/childrens-health/fever-in-children-high-temperature/febrile-seizure-febrile-convulsion). ## When should you see a doctor about a fever? You should contact a doctor if there is a high temperature (fever) and: - A child is under 3 months of age. - A child is 3-6 months of age with a fever of 39 degrees or more. - A child has a fit. - There is a rash that does not disappear when pressing a glass on it (a non-blanching rash), This is a potential medical emergency that requires attendance at an emergency department. - The person with the fever is becoming more unwell, for example with shortness of breath or chest pain. - A fever lasts longer than five days. - There is no obvious cause of the fever - for example, no cough or cold symptoms. - There may be a bacterial infection causing of the fever - for example, a urinary tract infection or a red hot swollen joint. Note: Fever itself is not harmful. Many people think they need to seek medical advice when a temperature reaches, for example, 39 degrees in a toddler. If there is an obvious cause for the temperature (for example, a cold with a runny nose) then medical advice does not need to be sought just because of the height of the temperature. This advice is different for babies under 6 months of age. ### What are the types of fever? Common types include continuous fever, where the temperature stays high with little variation, intermittent fever, where it comes and goes, and remittent fever, where it rises and falls but never fully returns to normal. ### What is a fever dream? A fever dream is a vivid or unsettling dream that happens when you have a fever. The changes in brain activity and sleep patterns can make your dreams feel more intense, strange, or even frightening. They usually pass once the fever settles. ## Article history The information on this page is written and peer reviewed by qualified clinicians. - Next review due: 7 Sept 2027 - ###### 8 Sept 2024 \\| Latest version
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