🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 50 (from laksa068)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa050.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://www.verywellhealth.com/fever-8685009\')), getAhrefsUnparsedNoserviceFromURL(\'https://www.verywellhealth.com/fever-8685009\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/www.verywellhealth.com\/fever-8685009","crawl_time":1775789322,"first_indexed_time":1721322952,"http_code":200,"src_unparsed":"com,verywellhealth!www,\/fever-8685009 s443","src_root_hash":"5681562863987870850","history_drop_reason":null,"meta_title":"Fever: Temperature Range, What’s Serious, Breaking It","meta_descriptions":["A fever is a rise in the body's temperature. Many cases of fever can be managed at home without seeing a provider. Learn when to seek medical attention."],"attrs_boilerpipe_text":"Key Takeaways\nIf a baby under 3 months has a rectal temperature of 100.4 F or higher, seek medical help.\nFor children ages 3 months to 3 years, seek medical help if a rectal temperature of 100.4 F lasts more than three days, if they're acting sick or fussy, or if the temperature is 102 F or higher.\nOlder children and adults should get medical help for an oral temperature of 104 F or higher or if they have accompanying symptoms like rash, severe headache, or stiff neck.\nFever is an elevation in the body's temperature. It's not a disease but rather a sign or response to something occurring within the body, most commonly an infection. Noninfectious conditions or scenarios like inflammatory diseases or medication reactions can also cause a fever.\nJohn Fedele \/ Getty Images\nWhat Is Considered a Normal Body Temperature?\nTo understand fever, it's important first to understand what a normal body temperature is.\nNormal Body Temperature Ranges\nThere is no formal definition for a normal body temperature, although general ranges exist.\nFactors affecting body temperature include age, measurement site (e.g., mouth vs. rectum vs. underarm), and time of day. Body temperature is naturally at its lowest in the early morning and highest in the late afternoon.\nIn\nadults\n, the average body temperature measured orally (by mouth) is 98.0 F (36.7 C), with an approximate range between 95.5 F and 99.9 F.\nIn most\nbabies and children\n, the normal body temperature range is between 97.7 F (36.5 C) and 99.5 F (37.5 C).\nTheir slightly higher body temperature is attributed to their greater total surface area in relation to their body weight and higher metabolisms.\nMeasurement Sites\nSites on the body for measuring temperature include:\nMouth (oral)\n: The tip of the\nthermometer\nis placed under the tongue and facing toward the back of the mouth.\nRectum\n(rectal)\n: A small amount of petroleum jelly is applied to the end of the thermometer, which is then placed one-half inch inside the anal canal. Rectal thermometers provide the best reading for babies under 3 months.\nArmpit (axillary)\n: The tip of the thermometer is placed on the skin in the armpit. This measurement method is invariably lower than the rectal or mouth temperature.\nEar (tympanic)\n: The top of the ear is pulled back, and an infrared scanning device is gently placed in the ear canal. The device uses heat from the eardrum and surrounding tissue to detect body temperature.\nForehead (temporal)\n: An infrared scanning device is slid or aimed across the forehead. It uses heat waves radiating off the forehead (temporal) artery to detect body temperature.\nWhat's Considered a Fever?\nThe\nhypothalamus\nis a small gland in the brain that controls the body's temperature, like a thermostat. Fever is an increase in body temperature that occurs when the hypothalamus's set point is shifted upwards in response to inflammation or infection.\nGenerally accepted ranges include the following:\nIn\nhealthy babies younger than 3 months\n, a fever is\na rectal temperature of 100.4 F or greater.\nIn \nchildren age 3 months to 36 months\n, a fever is\na rectal temperature between 100.4 F and 102.2 F.\nIn \nolder children and adults, \na fever is an oral temperature ranging from 100.0 F to 103.0 F.\nRectal temperatures should be taken for children under 4 years old, as they provide the most accurate reading.\nOral temperatures are generally acceptable for children around 4 or 5 years old. Forehead thermometers may be used for all ages. Axillary and tympanic temperatures are not recommended, as they are unreliable in young children.\nLow-Grade Fever Temperature Range\nA low-grade fever generally indicates a body temperature that is slightly above normal. There is no formally defined range, but one research article categorized it as between 99.1 F and 100.4 F.\nIn children, body temperatures between 99.5 F and 101.3 F are considered by some to be\nelevated\n.\nHigh Fever Temperature Range\nA high fever indicates a body temperature that is possibly serious or dangerous.\nAgain, there is no formal definition, but typically, a high fever is 102.2 F or greater in\nbabies 3 months and older and younger children\n.\nA high fever in\nolder children and adults\nis a temperature of 102.4 F or greater.\nFevers above 105.8 F are termed \"\nhyperpyrexia\n\" and can be seen with brain dysfunction, severe infections,\nor\nbrain bleeds\n.\nAn extremely high temperature above 105.8 F sometimes represents\nhyperthermia\n, which is different from a fever.\nHyperthermia can be rapidly fatal and is caused by a malfunctioning of the body's ability to manage heat coming from the environment.\nCauses include:\nExcessive clothing and bedding insulation in infants\nHeatstroke\nNeuroleptic malignant syndrome\n(a rare side effect associated with the use of antipsychotic drugs)\nHow to Break a Fever at Home\nMany fevers can be safely treated at home with fluids and rest, assuming no symptoms or signs of a serious illness are present.\nAntipyretic Drugs\nSometimes, fever-reducing medicines—called\nantipyretic\nagents\n—are used to ease discomfort, especially if the fever is high or other symptoms related to the fever are present. These can include malaise (general feeling of being unwell), headache, and muscle aches.\nAntipyretic agents are also often indicated in individuals with underlying heart or lung diseases, as fever can increase heart and breathing rates.\nTylenol (acetaminophen)\nand the\nnonsteroidal anti-inflammatory drug\n(NSAID)\nibuprofen\n, sold under the brand names Advil or Motrin, are commonly used antipyretics.\nTake Precautions\nTake an antipyretic (or give your child) only under the guidance of a healthcare provider, as they do carry risks.\nTaking too much Tylenol can cause liver injury and damage.\nLikewise, too much ibuprofen and other NSAIDs can cause stomach bleeding and may need to be avoided in individuals with heart or kidney disease, high blood pressure (hypertension), or bleeding problems.\nThis is why it is important to read the medication label carefully when giving these medications. Information on the label can help you determine the correct \ndose and frequency\n based on your child's weight.\nAlso, the NSAID \naspirin\n should never be used in kids under 19, as it's associated with\nReye's syndrome\n., a life-threatening condition.\nAn antipyretic is often unnecessary in a child older than 3 months who has a rectal temperature less than 102 F (38.9 C), seems well, and is behaving like their usual selves.\nCooling Therapies\nCooling therapies—such as cooling blankets or cool-water sponge baths—can help reduce fever in adults with high fevers, but only when used concurrently with an antipyretic.\nThis is because physical cooling of the body causes blood vessels in the skin to narrow, decreasing the body's ability to lose heat.\nCooling therapies are not recommended in babies or children with a fever-related illness.\nSchool and Work With a Fever\nTo prevent the spread of infection, a child or adult should be fever-free for 24 hours without the use of fever-reducing medications) and feel and appear well before returning to school, work, or other activities.\nFever Symptoms That Warrant Medical Attention\nIn many instances, seeing a healthcare provider or going to the emergency room is unnecessary for a fever, as the cause is often a viral infection that needs to run its course, typically three to five days.\nThat said, certain factors, such as an ill-appearing child or adult, underlying medical conditions, or worrisome symptoms, warrant medical attention.\nBabies and Children\nAccording to the American Academy of Pediatrics\nand experts from UpToDate,\nseek medical attention in the following scenarios:\nA baby less than 3 months of age with a rectal reading of 100.4 F (38 C) or higher, even if the baby looks well (avoid fever medication until speaking with the healthcare provider)\nChildren age 3 months to 3 years who have had a rectal reading of 100.4 F (38 C) or higher for more than one to three days or who appear ill or are fussy, unusually tired, clingy, or refuse to drink fluids\nChildren aged 3 months to 3 years who have a rectal reading of 102 F (38.9 C) or higher\nChildren of any age whose mouth\/ear\/rectal\/forehead reading is 104 F (40 C) or higher or whose axillary (armpit) reading is 103 F (39.4 C) or higher\nChildren of any age who have a fever and are taking\nsteroids\nand\/or have a chronic medical condition (e.g., cancer or\nsickle cell disease\n)\nChildren of any age who have a\nfebrile seizure\nChildren of any age who have been in a sweltering environment, like an overheated car\nIn addition, infants and children with a fever and any of the following symptoms also require immediate medical attention:\nNew skin rash\nStiff neck\nPersistent vomiting or diarrhea\nSevere headache\/sore throat\/ear pain\nSigns of dehydration\n(e.g., fewer wet diapers, dry mouth, no tears, sunken soft spot).\nChildren of any age with repeating fevers (even if they only last a few hours) without other symptoms for more than seven days or who act or appear ill, even when the fever is reduced, must be seen promptly by a healthcare provider.\nAdults\nIf you are an adult and have a fever, seek medical attention right away if you:\nAre pregnant\nAre recovering from a recent surgery or were recently hospitalized\nAre taking\nchemotherapy\n, steroids, or other drugs that weaken the immune system\nThink a\ntick\nmay have bitten you\nHave a chronic health condition like diabetes, heart disease, or cancer\nHave recently returned from a trip abroad, namely from Africa, Asia, Latin America, or the Middle East\nHave fevers that recur or persist\nGo to your nearest emergency room if your fever is accompanied by one or more of the following symptoms:\nSkin rash\nProblems breathing\nSevere headache or neck pain\/stiffness\nSeizure\nFeeling confused\nSevere or persistent vomiting or diarrhea\nPain in the stomach, back, or sides\nDo Not Hesitate to Get Help\nIf you (or your child) have a fever and are experiencing unusual or worrisome symptoms or have that gut instinct that something is wrong, don't hesitate to contact a healthcare provider or go to your nearest emergency room.\nCauses of Fever\nThere are multiple potential causes of fever.\nViral Infections are the most common cause. Examples include:\nThe\ncommon cold\nThe\nflu\n(influenza)\nCOVID-19\nAcute bronchitis\nViral\nstomach flu\n(e.g., rotavirus in young children)\nOther causes include bacterial infections such as:\nUrinary tract infections\n(UTIs)\nBacterial gastroenteritis\n(e.g., \nSalmonella\n)\nBacterial\notitis media\n(middle ear infection)\nSkin infections (e.g.,\ncellulitis\n)\nPneumonia\n(lung infection)\nSometimes, fever is caused by a non-infectious condition such as:\nAutoimmune diseases\n(e.g., lupus or rheumatoid arthritis)\nCancer\nReaction to a medication, vaccine, or blood transfusion\nAcute\npancreatitis\n(inflammation of the pancreas)\nAcute\ncholecystitis\n(inflammation of the gallbladder)","attrs_markdown":"[Skip to content](https:\/\/www.verywellhealth.com\/fever-8685009#skip-to-content)\n\nMenu\n\n- [Health A-Z](https:\/\/www.verywellhealth.com\/health-a-z-4014770)\n  - [Colorectal Cancer](https:\/\/www.verywellhealth.com\/colon-cancer-4014742)\n  - [Arthritis](https:\/\/www.verywellhealth.com\/arthritis-overview-4582013)\n  - 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[Complete Blood Count (CBC) Analyzer](https:\/\/www.verywellhealth.com\/complete-blood-count-cbc-analyzer-8647862)\n- [About Us](https:\/\/www.verywellhealth.com\/about-us-5180305)\n  - [Editorial Process](https:\/\/www.verywellhealth.com\/verywell-editorial-process-4777042)\n  - [Meet Our Medical Expert Board](https:\/\/www.verywellhealth.com\/meet-our-medical-expert-board-11762003)\n\nSearch\n\n- [Health A-Z](https:\/\/www.verywellhealth.com\/health-a-z-4014770)\n  - [Colorectal Cancer](https:\/\/www.verywellhealth.com\/colon-cancer-4014742)\n  - [Arthritis](https:\/\/www.verywellhealth.com\/arthritis-overview-4582013)\n  - [Type 2 Diabetes](https:\/\/www.verywellhealth.com\/type-2-diabetes-overview-4581874)\n  - [Digestive Health](https:\/\/www.verywellhealth.com\/digestive-health-4141198)\n  - [Multiple Sclerosis](https:\/\/www.verywellhealth.com\/multiple-sclerosis-overview-4581925)\n  - [Skin Health](https:\/\/www.verywellhealth.com\/skin-health-4014649)\n  - [View All](https:\/\/www.verywellhealth.com\/health-a-z-4014770)\n- [Prevention & Treatment](https:\/\/www.verywellhealth.com\/prevention-and-treatment-4158390)\n  - [Diet & Nutrition](https:\/\/www.verywellhealth.com\/nutrition-diet-and-healthy-eating-5202128)\n  - [First Aid](https:\/\/www.verywellhealth.com\/first-aid-4014723)\n  - [Surgery](https:\/\/www.verywellhealth.com\/surgery-overview-4581881)\n  - [View All](https:\/\/www.verywellhealth.com\/prevention-and-treatment-4158390)\n- [Health Care](https:\/\/www.verywellhealth.com\/health-care-4014769)\n  - [Health Insurance](https:\/\/www.verywellhealth.com\/health-insurance-overview-4581967)\n  - [Public Health](https:\/\/www.verywellhealth.com\/public-health-4158386)\n  - [Patient Rights](https:\/\/www.verywellhealth.com\/patient-rights-4014673)\n  - [Disability](https:\/\/www.verywellhealth.com\/disability-4014735)\n  - [Caregivers & Loved Ones](https:\/\/www.verywellhealth.com\/for-caregivers-and-loved-ones-4014749)\n  - [End of Life Concerns](https:\/\/www.verywellhealth.com\/end-of-life-overview-4581973)\n  - [View All](https:\/\/www.verywellhealth.com\/health-care-4014769)\n- [News](https:\/\/www.verywellhealth.com\/news-4846412)\n  - [Health News](https:\/\/www.verywellhealth.com\/health-news-4844929)\n  - [Studies & Guidelines](https:\/\/www.verywellhealth.com\/studies-and-guidelines-11869035)\n  - [View All](https:\/\/www.verywellhealth.com\/news-4846412)\n\n[More in Cold & Flu](https:\/\/www.verywellhealth.com\/cold-flu-overview-4581986)\n\n- [Symptoms](https:\/\/www.verywellhealth.com\/cold-flu-symptoms-overview-4581984)\n- [Prevention](https:\/\/www.verywellhealth.com\/cold-flu-prevention-overview-4581985)\n- [Treatment](https:\/\/www.verywellhealth.com\/cold-flu-treatment-overview-4581983)\n- [Common Cold](https:\/\/www.verywellhealth.com\/common-cold-overview-4581982)\n- [Flu](https:\/\/www.verywellhealth.com\/influenza-the-flu-4013643)\n- [Related Illnesses](https:\/\/www.verywellhealth.com\/cold-flu-related-illnesses-4013478)\n\n[View More](https:\/\/www.verywellhealth.com\/cold-flu-overview-4581986)\n\nTools & Resources\n\n- [Thyroid Test Analyzer](https:\/\/www.verywellhealth.com\/thyroid-test-analyzer-8647820)\n- [Doctor Discussion Guides](https:\/\/www.verywellhealth.com\/doctor-discussion-guides-4179090)\n- [Hemoglobin A1c Test Analyzer](https:\/\/www.verywellhealth.com\/a1c-test-analyzer-8647852)\n- [Lipid Test Analyzer](https:\/\/www.verywellhealth.com\/lipid-test-analyzer-8647856)\n- [Complete Blood Count (CBC) Analyzer](https:\/\/www.verywellhealth.com\/complete-blood-count-cbc-analyzer-8647862)\n\n- [About Us](https:\/\/www.verywellhealth.com\/about-us-5180305)\n- [Editorial Process](https:\/\/www.verywellhealth.com\/verywell-editorial-process-4777042)\n- [Medical Review Board](https:\/\/www.verywellhealth.com\/meet-our-medical-expert-board-11762003)\n\nVerywell Health's content is for informational and educational purposes only. Our website is not intended to be a substitute for professional medical advice, diagnosis, or treatment.\n\nⒸ 2026 People Inc. — All rights reserved\n\n# Fever: What’s Considered Low, High, and Possibly Serious?\nBy [Colleen Doherty, MD](https:\/\/www.verywellhealth.com\/colleen-doherty-md-4021130)\n\nUpdated on September 03, 2025\n\nMedically reviewed by  [Sameena Zahoor, MD](https:\/\/www.verywellhealth.com\/sameena-zahoor-5221384)\n\nTable of Contents\n\nView All\n\nTable of Contents\n\n- [Normal Temperature](https:\/\/www.verywellhealth.com\/fever-8685009#toc-what-is-considered-a-normal-body-temperature)\n- [Fever](https:\/\/www.verywellhealth.com\/fever-8685009#toc-whats-considered-a-fever)\n- [At-Home](https:\/\/www.verywellhealth.com\/fever-8685009#toc-how-to-break-a-fever-at-home)\n- [School or Work](https:\/\/www.verywellhealth.com\/fever-8685009#toc-school-and-work-with-a-fever)\n- [When to See a Provider](https:\/\/www.verywellhealth.com\/fever-8685009#toc-fever-symptoms-that-warrant-medical-attention)\n- [Causes of Fever](https:\/\/www.verywellhealth.com\/fever-8685009#toc-causes-of-fever)\n\n### Key Takeaways\n- If a baby under 3 months has a rectal temperature of 100.4 F or higher, seek medical help.\n- For children ages 3 months to 3 years, seek medical help if a rectal temperature of 100.4 F lasts more than three days, if they're acting sick or fussy, or if the temperature is 102 F or higher.\n- Older children and adults should get medical help for an oral temperature of 104 F or higher or if they have accompanying symptoms like rash, severe headache, or stiff neck.\n\nFever is an elevation in the body's temperature. It's not a disease but rather a sign or response to something occurring within the body, most commonly an infection. Noninfectious conditions or scenarios like inflammatory diseases or medication reactions can also cause a fever.\n\n![A parent reads a child's temperature on a digital thermometer.]()\n\n![A parent reads a child's temperature on a digital thermometer.](https:\/\/www.verywellhealth.com\/thmb\/1E0vmct69wVrtph31TZkOFubGiM=\/1500x0\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/fever-GettyImages-605764583-7d9de1bdc27c4d259e1aa6407557cf75.jpg)\n\nJohn Fedele \/ Getty Images\n## What Is Considered a Normal Body Temperature?\nTo understand fever, it's important first to understand what a normal body temperature is.\n\n### Normal Body Temperature Ranges\nThere is no formal definition for a normal body temperature, although general ranges exist.\n\nFactors affecting body temperature include age, measurement site (e.g., mouth vs. rectum vs. underarm), and time of day. Body temperature is naturally at its lowest in the early morning and highest in the late afternoon.\n\nIn **adults**, the average body temperature measured orally (by mouth) is 98.0 F (36.7 C), with an approximate range between 95.5 F and 99.9 F.\n\nIn most **babies and children**, the normal body temperature range is between 97.7 F (36.5 C) and 99.5 F (37.5 C). Their slightly higher body temperature is attributed to their greater total surface area in relation to their body weight and higher metabolisms.\n\n### Measurement Sites\nSites on the body for measuring temperature include:\n\n- **Mouth (oral)**: The tip of the [thermometer](https:\/\/www.verywellhealth.com\/best-thermometers-5094134) is placed under the tongue and facing toward the back of the mouth.\n- [**Rectum**](https:\/\/www.verywellhealth.com\/take-a-rectal-temperature-1298382) **(rectal)**: A small amount of petroleum jelly is applied to the end of the thermometer, which is then placed one-half inch inside the anal canal. Rectal thermometers provide the best reading for babies under 3 months.\n- **Armpit (axillary)**: The tip of the thermometer is placed on the skin in the armpit. This measurement method is invariably lower than the rectal or mouth temperature.\n- **Ear (tympanic)**: The top of the ear is pulled back, and an infrared scanning device is gently placed in the ear canal. The device uses heat from the eardrum and surrounding tissue to detect body temperature.\n- **Forehead (temporal)**: An infrared scanning device is slid or aimed across the forehead. It uses heat waves radiating off the forehead (temporal) artery to detect body temperature.\n## What's Considered a Fever?\nThe [hypothalamus](https:\/\/www.verywellhealth.com\/hypothalamus-8646628) is a small gland in the brain that controls the body's temperature, like a thermostat. Fever is an increase in body temperature that occurs when the hypothalamus's set point is shifted upwards in response to inflammation or infection.\n\nGenerally accepted ranges include the following:\n\n- In **healthy babies younger than 3 months**, a fever isa rectal temperature of 100.4 F or greater.\n- In **children age 3 months to 36 months**, a fever isa rectal temperature between 100.4 F and 102.2 F.\n- In **older children and adults,** a fever is an oral temperature ranging from 100.0 F to 103.0 F.\n\nRectal temperatures should be taken for children under 4 years old, as they provide the most accurate reading. Oral temperatures are generally acceptable for children around 4 or 5 years old. Forehead thermometers may be used for all ages. Axillary and tympanic temperatures are not recommended, as they are unreliable in young children.\n\n### Low-Grade Fever Temperature Range\nA low-grade fever generally indicates a body temperature that is slightly above normal. There is no formally defined range, but one research article categorized it as between 99.1 F and 100.4 F.\n\nIn children, body temperatures between 99.5 F and 101.3 F are considered by some to be **elevated**.\n\n### High Fever Temperature Range\nA high fever indicates a body temperature that is possibly serious or dangerous.\n\nAgain, there is no formal definition, but typically, a high fever is 102.2 F or greater in **babies 3 months and older and younger children**.\n\nA high fever in **older children and adults** is a temperature of 102.4 F or greater.\n\nFevers above 105.8 F are termed \"hyperpyrexia\" and can be seen with brain dysfunction, severe infections, or [brain bleeds](https:\/\/www.verywellhealth.com\/a-subdural-hematoma-is-bleed-into-the-brain-1720023).\n\nAn extremely high temperature above 105.8 F sometimes represents hyperthermia, which is different from a fever. Hyperthermia can be rapidly fatal and is caused by a malfunctioning of the body's ability to manage heat coming from the environment.\n\nCauses include:\n\n- Excessive clothing and bedding insulation in infants\n- Heatstroke\n- [Neuroleptic malignant syndrome](https:\/\/www.verywellhealth.com\/neuroleptic-malignant-syndrome-overview-4175001) (a rare side effect associated with the use of antipsychotic drugs)\n## How to Break a Fever at Home\nMany fevers can be safely treated at home with fluids and rest, assuming no symptoms or signs of a serious illness are present.\n\n### Antipyretic Drugs\nSometimes, fever-reducing medicines—called [antipyretic agents](https:\/\/www.verywellhealth.com\/over-the-counter-pain-relievers-and-fever-reducers-770678)—are used to ease discomfort, especially if the fever is high or other symptoms related to the fever are present. These can include malaise (general feeling of being unwell), headache, and muscle aches.\n\nAntipyretic agents are also often indicated in individuals with underlying heart or lung diseases, as fever can increase heart and breathing rates.\n\n[Tylenol (acetaminophen)](https:\/\/www.verywellhealth.com\/how-long-does-tylenol-acetaminophen-last-7500938) and the [nonsteroidal anti-inflammatory drug](https:\/\/www.verywellhealth.com\/best-anti-inflammatory-medication-2548734) (NSAID) [ibuprofen](https:\/\/www.verywellhealth.com\/ibuprofen-dosage-how-much-you-can-safely-take-8646449), sold under the brand names Advil or Motrin, are commonly used antipyretics.\n\n### Take Precautions\nTake an antipyretic (or give your child) only under the guidance of a healthcare provider, as they do carry risks.\n\nTaking too much Tylenol can cause liver injury and damage. Likewise, too much ibuprofen and other NSAIDs can cause stomach bleeding and may need to be avoided in individuals with heart or kidney disease, high blood pressure (hypertension), or bleeding problems.\n\nThis is why it is important to read the medication label carefully when giving these medications. Information on the label can help you determine the correct **dose and frequency** based on your child's weight.\n\nAlso, the NSAID [aspirin](https:\/\/www.verywellhealth.com\/nsaids-for-chronic-pain-2564481) should never be used in kids under 19, as it's associated with [Reye's syndrome](https:\/\/www.verywellhealth.com\/reyes-syndrome-2861001)., a life-threatening condition.\n\nAn antipyretic is often unnecessary in a child older than 3 months who has a rectal temperature less than 102 F (38.9 C), seems well, and is behaving like their usual selves.\n\n### Cooling Therapies\nCooling therapies—such as cooling blankets or cool-water sponge baths—can help reduce fever in adults with high fevers, but only when used concurrently with an antipyretic. This is because physical cooling of the body causes blood vessels in the skin to narrow, decreasing the body's ability to lose heat.\n\nCooling therapies are not recommended in babies or children with a fever-related illness.\n\n## School and Work With a Fever\nTo prevent the spread of infection, a child or adult should be fever-free for 24 hours without the use of fever-reducing medications) and feel and appear well before returning to school, work, or other activities.\n\n## Fever Symptoms That Warrant Medical Attention\nIn many instances, seeing a healthcare provider or going to the emergency room is unnecessary for a fever, as the cause is often a viral infection that needs to run its course, typically three to five days.\n\nThat said, certain factors, such as an ill-appearing child or adult, underlying medical conditions, or worrisome symptoms, warrant medical attention.\n\n### Babies and Children\nAccording to the American Academy of Pediatrics and experts from UpToDate, seek medical attention in the following scenarios:\n\n- A baby less than 3 months of age with a rectal reading of 100.4 F (38 C) or higher, even if the baby looks well (avoid fever medication until speaking with the healthcare provider)\n- Children age 3 months to 3 years who have had a rectal reading of 100.4 F (38 C) or higher for more than one to three days or who appear ill or are fussy, unusually tired, clingy, or refuse to drink fluids\n- Children aged 3 months to 3 years who have a rectal reading of 102 F (38.9 C) or higher\n- Children of any age whose mouth\/ear\/rectal\/forehead reading is 104 F (40 C) or higher or whose axillary (armpit) reading is 103 F (39.4 C) or higher\n- Children of any age who have a fever and are taking [steroids](https:\/\/www.verywellhealth.com\/facts-about-corticosteroids-steroids-188358) and\/or have a chronic medical condition (e.g., cancer or [sickle cell disease](https:\/\/www.verywellhealth.com\/sickle-cell-anemia-2861015))\n- Children of any age who have a [febrile seizure](https:\/\/www.verywellhealth.com\/what-is-a-convulsion-4144876)\n- Children of any age who have been in a sweltering environment, like an overheated car\n\nIn addition, infants and children with a fever and any of the following symptoms also require immediate medical attention:\n\n- New skin rash\n- Stiff neck\n- Persistent vomiting or diarrhea\n- Severe headache\/sore throat\/ear pain\n- [Signs of dehydration](https:\/\/www.verywellhealth.com\/dehydration-symptoms-8662174) (e.g., fewer wet diapers, dry mouth, no tears, sunken soft spot).\n\nChildren of any age with repeating fevers (even if they only last a few hours) without other symptoms for more than seven days or who act or appear ill, even when the fever is reduced, must be seen promptly by a healthcare provider.\n\n### Adults\nIf you are an adult and have a fever, seek medical attention right away if you:\n\n- Are pregnant\n- Are recovering from a recent surgery or were recently hospitalized\n- Are taking [chemotherapy](https:\/\/www.verywellhealth.com\/chemotherapy-4014085), steroids, or other drugs that weaken the immune system\n- Think a [tick](https:\/\/www.verywellhealth.com\/tick-bite-symptoms-5186154) may have bitten you\n- Have a chronic health condition like diabetes, heart disease, or cancer\n- Have recently returned from a trip abroad, namely from Africa, Asia, Latin America, or the Middle East\n- Have fevers that recur or persist\n\nGo to your nearest emergency room if your fever is accompanied by one or more of the following symptoms:\n\n- Skin rash\n- Problems breathing\n- Severe headache or neck pain\/stiffness\n- Seizure\n- Feeling confused\n- Severe or persistent vomiting or diarrhea\n- Pain in the stomach, back, or sides\n\n### Do Not Hesitate to Get Help\nIf you (or your child) have a fever and are experiencing unusual or worrisome symptoms or have that gut instinct that something is wrong, don't hesitate to contact a healthcare provider or go to your nearest emergency room.\n## Causes of Fever\nThere are multiple potential causes of fever.\n\nViral Infections are the most common cause. Examples include:\n\n- The [common cold](https:\/\/www.verywellhealth.com\/cold-7152003)\n- The [flu](https:\/\/www.verywellhealth.com\/flu-7109004) (influenza)\n- [COVID-19](https:\/\/www.verywellhealth.com\/coronavirus-overview-4783291)\n- [Acute bronchitis](https:\/\/www.verywellhealth.com\/symptoms-of-bronchitis-770332)\n- Viral [stomach flu](https:\/\/www.verywellhealth.com\/stomach-flu-7104131) (e.g., rotavirus in young children)\n\nOther causes include bacterial infections such as:\n\n- [Urinary tract infections](https:\/\/www.verywellhealth.com\/urinary-tract-infection-uti-7372902) (UTIs)\n- [Bacterial gastroenteritis](https:\/\/www.verywellhealth.com\/bacterial-gastroenteritis-5219755) (e.g., *Salmonella*)\n- Bacterial [otitis media](https:\/\/www.verywellhealth.com\/ear-infections-5092929) (middle ear infection)\n- Skin infections (e.g., [cellulitis](https:\/\/www.verywellhealth.com\/what-is-cellulitis-1958753))\n- [Pneumonia](https:\/\/www.verywellhealth.com\/pneumonia-7151990) (lung infection)\n\nSometimes, fever is caused by a non-infectious condition such as:\n\n- [Autoimmune diseases](https:\/\/www.verywellhealth.com\/autoimmune-diseases-overview-3232654) (e.g., lupus or rheumatoid arthritis)\n- Cancer\n- Reaction to a medication, vaccine, or blood transfusion\n- Acute [pancreatitis](https:\/\/www.verywellhealth.com\/acute-or-chronic-pancreatitis-symptoms-and-treatments-3520426) (inflammation of the pancreas)\n- Acute [cholecystitis](https:\/\/www.verywellhealth.com\/cholecystitis-overview-4588159) (inflammation of the gallbladder)\n\nRead more:\n\n- [Health A-Z](https:\/\/www.verywellhealth.com\/health-a-z-4014770)\n- [Cold & Flu](https:\/\/www.verywellhealth.com\/cold-flu-overview-4581986)\n- [Symptoms](https:\/\/www.verywellhealth.com\/cold-flu-symptoms-overview-4581984)\n\n22 Sources\n\nVerywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our [editorial process](https:\/\/www.verywellhealth.com\/verywell-editorial-process-4777042) to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.\n\n1. Bush LM. [Fever](https:\/\/www.merckmanuals.com\/professional\/infectious-diseases\/biology-of-infectious-disease\/fever). Merck Manual Professional Version.\n2. Speaker SL, Pfoh ER, Pappas MA, Hu B, Rothberg MB. [Oral temperature of noninfected hospitalized patients](https:\/\/doi.org\/10.1001\/jama.2021.1541). *JAMA*. 2021;325(18):1899-1901. doi:10.1001\/jama.2021.1541\n3. InformedHealth.org. [Overview: fever in children](https:\/\/www.ncbi.nlm.nih.gov\/books\/NBK279455\/).\n4. American Academy of Pediatrics. [Thermometers 101: how to check temperature during COVID-19 pandemic](https:\/\/publications.aap.org\/aapnews\/news\/14385\/Thermometers-101-How-to-check-temperature-during)\n5. American Academy of Pediatrics. [Fever without fear: information for parents](https:\/\/www.healthychildren.org\/English\/health-issues\/conditions\/fever\/Pages\/Fever-Without-Fear.aspx).\n6. Ward MA. [Fever in infants and children](https:\/\/www.uptodate.com\/contents\/fever-in-infants-and-children-pathophysiology-and-management). In: *UpToDate*, Edwards MS (Ed), UpToDate, Waltham, MA.\n7. American Academy of Pediatrics. [How to take your child's temperature](https:\/\/www.healthychildren.org\/English\/health-issues\/conditions\/fever\/Pages\/How-to-Take-a-Childs-Temperature.aspx).\n8. Islam MA, Kundu S, Alam SS, Hossan T, Kamal MA, Hassan R. [Prevalence and characteristics of fever in adult and paediatric patients with coronavirus disease 2019 (COVID-19): a systematic review and meta-analysis of 17515 patients](https:\/\/doi.org\/10.1371\/journal.pone.0249788). *PLoS One*. 2021;16(4):e0249788. doi:10.1371\/journal.pone.0249788\n9. KidsHealth. [Fever (high temperature) in kids](https:\/\/kidshealth.org\/en\/parents\/fever.html).\n10. Suwanwongse K, Shabarek N. [Hyperpyrexia in patients with COVID-19](https:\/\/doi.org\/10.1002\/jmv.26154). *J Med Virol*. 2020;92(11):2857-2862. doi:10.1002\/jmv.26154\n11. Samudra N, Figueroa S. [Intractable central hyperthermia in the setting of brainstem hemorrhage](https:\/\/doi.org\/10.1089\/ther.2016.0004). *Ther Hypothermia Temp Manag*. 2016;6(2):98-101. doi:10.1089\/ther.2016.0004\n12. Harvard Health Publishing. [Heat stroke (hyperthermia)](https:\/\/www.health.harvard.edu\/a_to_z\/heat-stroke-hyperthermia-a-to-z).\n13. Bach V, Libert JP. [Hyperthermia and Heat Stress as Risk Factors for Sudden Infant Death Syndrome: A Narrative Review](https:\/\/dx.doi.org\/10.3389\/fped.2022.816136). *Front Pediatr*. 2022 Apr 15;10:816136. doi:10.3389\/fped.2022.816136\n14. Bush LM. [Fever in adults](https:\/\/www.merckmanuals.com\/home\/infections\/biology-of-infectious-disease\/fever-in-adults). Merck Manual Consumer Version.\n15. National Institute of Diabetes and Digestive and Kidney Diseases. [Clinical and research information on drug-induced liver injury: acetaminophen](https:\/\/www.ncbi.nlm.nih.gov\/books\/NBK548162\/).\n16. DailyMed. [Label: ibuprofen tablet](https:\/\/dailymed.nlm.nih.gov\/dailymed\/lookup.cfm?setid=faebc392-0fd9-4c71-8471-beba10dda022).\n17. Barbi E, Marzuillo P, Neri E, Naviglio S, Krauss BS. [Fever in children: pearls and pitfalls](https:\/\/doi.org\/10.3390\/children4090081). *Children (Basel)*. 2017;4(9):81. doi:10.3390\/children4090081\n18. Ward MA. [Patient education: fever in children (beyond the basics)](https:\/\/www.uptodate.com\/contents\/fever-in-children-beyond-the-basics\/print). In: *UpToDate*, Edwards MS (Ed), UpToDate, Waltham, MA\n19. Dinarello CA, Porat R. [Pathophysiology and treatment of fever in adults](https:\/\/www.uptodate.com\/contents\/pathophysiology-and-treatment-of-fever-in-adults). In: *UpToDate*, Spelman D (Ed), UpToDate, Waltham, MA.\n20. Centers for Disease Control and Prevention. [Preventing the spread of respiratory viruses when you're sick](https:\/\/www.cdc.gov\/respiratory-viruses\/prevention\/precautions-when-sick.html).\n21. El-Radhi AS. [Fever in common infectious diseases](https:\/\/doi.org\/10.1007\/978-3-319-92336-9_5). *Clinical Manual of Fever in Children*. 2019:85–140. doi:10.1007\/978-3-319-92336-9\\_5\n22. Steele GM, Franco-Paredes C, Chastain DB. [Noninfectious causes of fever in adults](https:\/\/doi.org\/10.1097\/01.NPR.0000531067.65817.7d). *Nurse Pract.* 2018;43(4):38-44. doi:10.1097\/01.NPR.0000531067.65817.7d\n\n![Colleen Doherty, MD]()\n\n![Colleen Doherty, MD](https:\/\/www.verywellhealth.com\/thmb\/CwTTG7I9kjUMmZvYB3LFbSHFvIU=\/144x144\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/Colleen-Doherty-MD-660-9d8d5f15b5a8408d91816814d441735b.jpg)\n\nBy [Colleen Doherty, MD](https:\/\/www.verywellhealth.com\/colleen-doherty-md-4021130)   \n Dr. Doherty is a board-certified internist and writer living with multiple sclerosis. She is based in Chicago.\n\n[See Our Editorial Process](https:\/\/www.verywellhealth.com\/verywell-editorial-process-4777042)\n\n[Meet Our Medical Expert Board](https:\/\/www.verywellhealth.com\/meet-our-medical-expert-board-11762003)\n\nShare Feedback\n\nWas this page helpful?\n\nThanks for your feedback\\!\n\nWhat is your feedback?\n\nHelpful\n\nReport an Error\n\nOther\n\nRelated Articles\n\n[![Man on the phone looking at a thermometer with his sick family in the room]() ![Man on the phone looking at a thermometer with his sick family in the room](https:\/\/www.verywellhealth.com\/thmb\/fu2Ee7Dau9G8DnmJGaX_VOwOqkw=\/400x250\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/GettyImages-98472188-56819c613df78ccc15b430c4.jpg) When Is a Fever Too High?](https:\/\/www.verywellhealth.com\/when-is-a-fever-too-high-770347)\n\n[![Flu aches and pains]() ![Flu aches and pains](https:\/\/www.verywellhealth.com\/thmb\/KuWTiaPeyEN1A0bXuIinE4P0Bhw=\/400x250\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/82255260-56a179f23df78cf7726b06ac.jpg) Sick and Achy? 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Our website is not intended to be a substitute for professional medical advice, diagnosis, or treatment.\n\nⒸ 2026 People Inc. — All rights reserved\n\nVerywell Health is part of the [People Inc.](https:\/\/www.people.inc\/) publishing family.","attrs_readable_markdown":"### Key Takeaways\n- If a baby under 3 months has a rectal temperature of 100.4 F or higher, seek medical help.\n- For children ages 3 months to 3 years, seek medical help if a rectal temperature of 100.4 F lasts more than three days, if they're acting sick or fussy, or if the temperature is 102 F or higher.\n- Older children and adults should get medical help for an oral temperature of 104 F or higher or if they have accompanying symptoms like rash, severe headache, or stiff neck.\n\nFever is an elevation in the body's temperature. It's not a disease but rather a sign or response to something occurring within the body, most commonly an infection. Noninfectious conditions or scenarios like inflammatory diseases or medication reactions can also cause a fever.\n\nJohn Fedele \/ Getty Images\n\n## What Is Considered a Normal Body Temperature?\nTo understand fever, it's important first to understand what a normal body temperature is.\n\n### Normal Body Temperature Ranges\nThere is no formal definition for a normal body temperature, although general ranges exist.\n\nFactors affecting body temperature include age, measurement site (e.g., mouth vs. rectum vs. underarm), and time of day. Body temperature is naturally at its lowest in the early morning and highest in the late afternoon.\n\nIn **adults**, the average body temperature measured orally (by mouth) is 98.0 F (36.7 C), with an approximate range between 95.5 F and 99.9 F.\n\nIn most **babies and children**, the normal body temperature range is between 97.7 F (36.5 C) and 99.5 F (37.5 C). Their slightly higher body temperature is attributed to their greater total surface area in relation to their body weight and higher metabolisms.\n\n### Measurement Sites\nSites on the body for measuring temperature include:\n\n- **Mouth (oral)**: The tip of the [thermometer](https:\/\/www.verywellhealth.com\/best-thermometers-5094134) is placed under the tongue and facing toward the back of the mouth.\n- [**Rectum**](https:\/\/www.verywellhealth.com\/take-a-rectal-temperature-1298382) **(rectal)**: A small amount of petroleum jelly is applied to the end of the thermometer, which is then placed one-half inch inside the anal canal. Rectal thermometers provide the best reading for babies under 3 months.\n- **Armpit (axillary)**: The tip of the thermometer is placed on the skin in the armpit. This measurement method is invariably lower than the rectal or mouth temperature.\n- **Ear (tympanic)**: The top of the ear is pulled back, and an infrared scanning device is gently placed in the ear canal. The device uses heat from the eardrum and surrounding tissue to detect body temperature.\n- **Forehead (temporal)**: An infrared scanning device is slid or aimed across the forehead. It uses heat waves radiating off the forehead (temporal) artery to detect body temperature.\n## What's Considered a Fever?\nThe [hypothalamus](https:\/\/www.verywellhealth.com\/hypothalamus-8646628) is a small gland in the brain that controls the body's temperature, like a thermostat. Fever is an increase in body temperature that occurs when the hypothalamus's set point is shifted upwards in response to inflammation or infection.\n\nGenerally accepted ranges include the following:\n\n- In **healthy babies younger than 3 months**, a fever isa rectal temperature of 100.4 F or greater.\n- In **children age 3 months to 36 months**, a fever isa rectal temperature between 100.4 F and 102.2 F.\n- In **older children and adults,** a fever is an oral temperature ranging from 100.0 F to 103.0 F.\n\nRectal temperatures should be taken for children under 4 years old, as they provide the most accurate reading. Oral temperatures are generally acceptable for children around 4 or 5 years old. Forehead thermometers may be used for all ages. Axillary and tympanic temperatures are not recommended, as they are unreliable in young children.\n\n### Low-Grade Fever Temperature Range\nA low-grade fever generally indicates a body temperature that is slightly above normal. There is no formally defined range, but one research article categorized it as between 99.1 F and 100.4 F.\n\nIn children, body temperatures between 99.5 F and 101.3 F are considered by some to be **elevated**.\n\n### High Fever Temperature Range\nA high fever indicates a body temperature that is possibly serious or dangerous.\n\nAgain, there is no formal definition, but typically, a high fever is 102.2 F or greater in **babies 3 months and older and younger children**.\n\nA high fever in **older children and adults** is a temperature of 102.4 F or greater.\n\nFevers above 105.8 F are termed \"hyperpyrexia\" and can be seen with brain dysfunction, severe infections, or [brain bleeds](https:\/\/www.verywellhealth.com\/a-subdural-hematoma-is-bleed-into-the-brain-1720023).\n\nAn extremely high temperature above 105.8 F sometimes represents hyperthermia, which is different from a fever. Hyperthermia can be rapidly fatal and is caused by a malfunctioning of the body's ability to manage heat coming from the environment.\n\nCauses include:\n\n- Excessive clothing and bedding insulation in infants\n- Heatstroke\n- [Neuroleptic malignant syndrome](https:\/\/www.verywellhealth.com\/neuroleptic-malignant-syndrome-overview-4175001) (a rare side effect associated with the use of antipsychotic drugs)\n## How to Break a Fever at Home\nMany fevers can be safely treated at home with fluids and rest, assuming no symptoms or signs of a serious illness are present.\n\n### Antipyretic Drugs\nSometimes, fever-reducing medicines—called [antipyretic agents](https:\/\/www.verywellhealth.com\/over-the-counter-pain-relievers-and-fever-reducers-770678)—are used to ease discomfort, especially if the fever is high or other symptoms related to the fever are present. These can include malaise (general feeling of being unwell), headache, and muscle aches.\n\nAntipyretic agents are also often indicated in individuals with underlying heart or lung diseases, as fever can increase heart and breathing rates.\n\n[Tylenol (acetaminophen)](https:\/\/www.verywellhealth.com\/how-long-does-tylenol-acetaminophen-last-7500938) and the [nonsteroidal anti-inflammatory drug](https:\/\/www.verywellhealth.com\/best-anti-inflammatory-medication-2548734) (NSAID) [ibuprofen](https:\/\/www.verywellhealth.com\/ibuprofen-dosage-how-much-you-can-safely-take-8646449), sold under the brand names Advil or Motrin, are commonly used antipyretics.\n\n### Take Precautions\nTake an antipyretic (or give your child) only under the guidance of a healthcare provider, as they do carry risks.\n\nTaking too much Tylenol can cause liver injury and damage. Likewise, too much ibuprofen and other NSAIDs can cause stomach bleeding and may need to be avoided in individuals with heart or kidney disease, high blood pressure (hypertension), or bleeding problems.\n\nThis is why it is important to read the medication label carefully when giving these medications. Information on the label can help you determine the correct **dose and frequency** based on your child's weight.\n\nAlso, the NSAID [aspirin](https:\/\/www.verywellhealth.com\/nsaids-for-chronic-pain-2564481) should never be used in kids under 19, as it's associated with [Reye's syndrome](https:\/\/www.verywellhealth.com\/reyes-syndrome-2861001)., a life-threatening condition.\n\nAn antipyretic is often unnecessary in a child older than 3 months who has a rectal temperature less than 102 F (38.9 C), seems well, and is behaving like their usual selves.\n\n### Cooling Therapies\nCooling therapies—such as cooling blankets or cool-water sponge baths—can help reduce fever in adults with high fevers, but only when used concurrently with an antipyretic. This is because physical cooling of the body causes blood vessels in the skin to narrow, decreasing the body's ability to lose heat.\n\nCooling therapies are not recommended in babies or children with a fever-related illness.\n\n## School and Work With a Fever\nTo prevent the spread of infection, a child or adult should be fever-free for 24 hours without the use of fever-reducing medications) and feel and appear well before returning to school, work, or other activities.\n\n## Fever Symptoms That Warrant Medical Attention\nIn many instances, seeing a healthcare provider or going to the emergency room is unnecessary for a fever, as the cause is often a viral infection that needs to run its course, typically three to five days.\n\nThat said, certain factors, such as an ill-appearing child or adult, underlying medical conditions, or worrisome symptoms, warrant medical attention.\n\n### Babies and Children\nAccording to the American Academy of Pediatrics and experts from UpToDate, seek medical attention in the following scenarios:\n\n- A baby less than 3 months of age with a rectal reading of 100.4 F (38 C) or higher, even if the baby looks well (avoid fever medication until speaking with the healthcare provider)\n- Children age 3 months to 3 years who have had a rectal reading of 100.4 F (38 C) or higher for more than one to three days or who appear ill or are fussy, unusually tired, clingy, or refuse to drink fluids\n- Children aged 3 months to 3 years who have a rectal reading of 102 F (38.9 C) or higher\n- Children of any age whose mouth\/ear\/rectal\/forehead reading is 104 F (40 C) or higher or whose axillary (armpit) reading is 103 F (39.4 C) or higher\n- Children of any age who have a fever and are taking [steroids](https:\/\/www.verywellhealth.com\/facts-about-corticosteroids-steroids-188358) and\/or have a chronic medical condition (e.g., cancer or [sickle cell disease](https:\/\/www.verywellhealth.com\/sickle-cell-anemia-2861015))\n- Children of any age who have a [febrile seizure](https:\/\/www.verywellhealth.com\/what-is-a-convulsion-4144876)\n- Children of any age who have been in a sweltering environment, like an overheated car\n\nIn addition, infants and children with a fever and any of the following symptoms also require immediate medical attention:\n\n- New skin rash\n- Stiff neck\n- Persistent vomiting or diarrhea\n- Severe headache\/sore throat\/ear pain\n- [Signs of dehydration](https:\/\/www.verywellhealth.com\/dehydration-symptoms-8662174) (e.g., fewer wet diapers, dry mouth, no tears, sunken soft spot).\n\nChildren of any age with repeating fevers (even if they only last a few hours) without other symptoms for more than seven days or who act or appear ill, even when the fever is reduced, must be seen promptly by a healthcare provider.\n\n### Adults\nIf you are an adult and have a fever, seek medical attention right away if you:\n\n- Are pregnant\n- Are recovering from a recent surgery or were recently hospitalized\n- Are taking [chemotherapy](https:\/\/www.verywellhealth.com\/chemotherapy-4014085), steroids, or other drugs that weaken the immune system\n- Think a [tick](https:\/\/www.verywellhealth.com\/tick-bite-symptoms-5186154) may have bitten you\n- Have a chronic health condition like diabetes, heart disease, or cancer\n- Have recently returned from a trip abroad, namely from Africa, Asia, Latin America, or the Middle East\n- Have fevers that recur or persist\n\nGo to your nearest emergency room if your fever is accompanied by one or more of the following symptoms:\n\n- Skin rash\n- Problems breathing\n- Severe headache or neck pain\/stiffness\n- Seizure\n- Feeling confused\n- Severe or persistent vomiting or diarrhea\n- Pain in the stomach, back, or sides\n\n### Do Not Hesitate to Get Help\nIf you (or your child) have a fever and are experiencing unusual or worrisome symptoms or have that gut instinct that something is wrong, don't hesitate to contact a healthcare provider or go to your nearest emergency room.\n## Causes of Fever\nThere are multiple potential causes of fever.\n\nViral Infections are the most common cause. Examples include:\n\n- The [common cold](https:\/\/www.verywellhealth.com\/cold-7152003)\n- The [flu](https:\/\/www.verywellhealth.com\/flu-7109004) (influenza)\n- [COVID-19](https:\/\/www.verywellhealth.com\/coronavirus-overview-4783291)\n- [Acute bronchitis](https:\/\/www.verywellhealth.com\/symptoms-of-bronchitis-770332)\n- Viral [stomach flu](https:\/\/www.verywellhealth.com\/stomach-flu-7104131) (e.g., rotavirus in young children)\n\nOther causes include bacterial infections such as:\n\n- [Urinary tract infections](https:\/\/www.verywellhealth.com\/urinary-tract-infection-uti-7372902) (UTIs)\n- [Bacterial gastroenteritis](https:\/\/www.verywellhealth.com\/bacterial-gastroenteritis-5219755) (e.g., *Salmonella*)\n- Bacterial [otitis media](https:\/\/www.verywellhealth.com\/ear-infections-5092929) (middle ear infection)\n- Skin infections (e.g., [cellulitis](https:\/\/www.verywellhealth.com\/what-is-cellulitis-1958753))\n- [Pneumonia](https:\/\/www.verywellhealth.com\/pneumonia-7151990) (lung infection)\n\nSometimes, fever is caused by a non-infectious condition such as:\n\n- [Autoimmune diseases](https:\/\/www.verywellhealth.com\/autoimmune-diseases-overview-3232654) (e.g., lupus or rheumatoid arthritis)\n- Cancer\n- Reaction to a medication, vaccine, or blood transfusion\n- Acute [pancreatitis](https:\/\/www.verywellhealth.com\/acute-or-chronic-pancreatitis-symptoms-and-treatments-3520426) (inflammation of the pancreas)\n- Acute [cholecystitis](https:\/\/www.verywellhealth.com\/cholecystitis-overview-4588159) (inflammation of the gallbladder)","meta_canonical":null}

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Boilerpipe Text	Key Takeaways If a baby under 3 months has a rectal temperature of 100.4 F or higher, seek medical help. For children ages 3 months to 3 years, seek medical help if a rectal temperature of 100.4 F lasts more than three days, if they're acting sick or fussy, or if the temperature is 102 F or higher. Older children and adults should get medical help for an oral temperature of 104 F or higher or if they have accompanying symptoms like rash, severe headache, or stiff neck. Fever is an elevation in the body's temperature. It's not a disease but rather a sign or response to something occurring within the body, most commonly an infection. Noninfectious conditions or scenarios like inflammatory diseases or medication reactions can also cause a fever. John Fedele / Getty Images What Is Considered a Normal Body Temperature? To understand fever, it's important first to understand what a normal body temperature is. Normal Body Temperature Ranges There is no formal definition for a normal body temperature, although general ranges exist. Factors affecting body temperature include age, measurement site (e.g., mouth vs. rectum vs. underarm), and time of day. Body temperature is naturally at its lowest in the early morning and highest in the late afternoon. In adults , the average body temperature measured orally (by mouth) is 98.0 F (36.7 C), with an approximate range between 95.5 F and 99.9 F. In most babies and children , the normal body temperature range is between 97.7 F (36.5 C) and 99.5 F (37.5 C). Their slightly higher body temperature is attributed to their greater total surface area in relation to their body weight and higher metabolisms. Measurement Sites Sites on the body for measuring temperature include: Mouth (oral) : The tip of the thermometer is placed under the tongue and facing toward the back of the mouth. Rectum (rectal) : A small amount of petroleum jelly is applied to the end of the thermometer, which is then placed one-half inch inside the anal canal. Rectal thermometers provide the best reading for babies under 3 months. Armpit (axillary) : The tip of the thermometer is placed on the skin in the armpit. This measurement method is invariably lower than the rectal or mouth temperature. Ear (tympanic) : The top of the ear is pulled back, and an infrared scanning device is gently placed in the ear canal. The device uses heat from the eardrum and surrounding tissue to detect body temperature. Forehead (temporal) : An infrared scanning device is slid or aimed across the forehead. It uses heat waves radiating off the forehead (temporal) artery to detect body temperature. What's Considered a Fever? The hypothalamus is a small gland in the brain that controls the body's temperature, like a thermostat. Fever is an increase in body temperature that occurs when the hypothalamus's set point is shifted upwards in response to inflammation or infection. Generally accepted ranges include the following: In healthy babies younger than 3 months , a fever is a rectal temperature of 100.4 F or greater. In children age 3 months to 36 months , a fever is a rectal temperature between 100.4 F and 102.2 F. In older children and adults, a fever is an oral temperature ranging from 100.0 F to 103.0 F. Rectal temperatures should be taken for children under 4 years old, as they provide the most accurate reading. Oral temperatures are generally acceptable for children around 4 or 5 years old. Forehead thermometers may be used for all ages. Axillary and tympanic temperatures are not recommended, as they are unreliable in young children. Low-Grade Fever Temperature Range A low-grade fever generally indicates a body temperature that is slightly above normal. There is no formally defined range, but one research article categorized it as between 99.1 F and 100.4 F. In children, body temperatures between 99.5 F and 101.3 F are considered by some to be elevated . High Fever Temperature Range A high fever indicates a body temperature that is possibly serious or dangerous. Again, there is no formal definition, but typically, a high fever is 102.2 F or greater in babies 3 months and older and younger children . A high fever in older children and adults is a temperature of 102.4 F or greater. Fevers above 105.8 F are termed " hyperpyrexia " and can be seen with brain dysfunction, severe infections, or brain bleeds . An extremely high temperature above 105.8 F sometimes represents hyperthermia , which is different from a fever. Hyperthermia can be rapidly fatal and is caused by a malfunctioning of the body's ability to manage heat coming from the environment. Causes include: Excessive clothing and bedding insulation in infants Heatstroke Neuroleptic malignant syndrome (a rare side effect associated with the use of antipsychotic drugs) How to Break a Fever at Home Many fevers can be safely treated at home with fluids and rest, assuming no symptoms or signs of a serious illness are present. Antipyretic Drugs Sometimes, fever-reducing medicines—called antipyretic agents —are used to ease discomfort, especially if the fever is high or other symptoms related to the fever are present. These can include malaise (general feeling of being unwell), headache, and muscle aches. Antipyretic agents are also often indicated in individuals with underlying heart or lung diseases, as fever can increase heart and breathing rates. Tylenol (acetaminophen) and the nonsteroidal anti-inflammatory drug (NSAID) ibuprofen , sold under the brand names Advil or Motrin, are commonly used antipyretics. Take Precautions Take an antipyretic (or give your child) only under the guidance of a healthcare provider, as they do carry risks. Taking too much Tylenol can cause liver injury and damage. Likewise, too much ibuprofen and other NSAIDs can cause stomach bleeding and may need to be avoided in individuals with heart or kidney disease, high blood pressure (hypertension), or bleeding problems. This is why it is important to read the medication label carefully when giving these medications. Information on the label can help you determine the correct dose and frequency based on your child's weight. Also, the NSAID aspirin should never be used in kids under 19, as it's associated with Reye's syndrome ., a life-threatening condition. An antipyretic is often unnecessary in a child older than 3 months who has a rectal temperature less than 102 F (38.9 C), seems well, and is behaving like their usual selves. Cooling Therapies Cooling therapies—such as cooling blankets or cool-water sponge baths—can help reduce fever in adults with high fevers, but only when used concurrently with an antipyretic. This is because physical cooling of the body causes blood vessels in the skin to narrow, decreasing the body's ability to lose heat. Cooling therapies are not recommended in babies or children with a fever-related illness. School and Work With a Fever To prevent the spread of infection, a child or adult should be fever-free for 24 hours without the use of fever-reducing medications) and feel and appear well before returning to school, work, or other activities. Fever Symptoms That Warrant Medical Attention In many instances, seeing a healthcare provider or going to the emergency room is unnecessary for a fever, as the cause is often a viral infection that needs to run its course, typically three to five days. That said, certain factors, such as an ill-appearing child or adult, underlying medical conditions, or worrisome symptoms, warrant medical attention. Babies and Children According to the American Academy of Pediatrics and experts from UpToDate, seek medical attention in the following scenarios: A baby less than 3 months of age with a rectal reading of 100.4 F (38 C) or higher, even if the baby looks well (avoid fever medication until speaking with the healthcare provider) Children age 3 months to 3 years who have had a rectal reading of 100.4 F (38 C) or higher for more than one to three days or who appear ill or are fussy, unusually tired, clingy, or refuse to drink fluids Children aged 3 months to 3 years who have a rectal reading of 102 F (38.9 C) or higher Children of any age whose mouth/ear/rectal/forehead reading is 104 F (40 C) or higher or whose axillary (armpit) reading is 103 F (39.4 C) or higher Children of any age who have a fever and are taking steroids and/or have a chronic medical condition (e.g., cancer or sickle cell disease ) Children of any age who have a febrile seizure Children of any age who have been in a sweltering environment, like an overheated car In addition, infants and children with a fever and any of the following symptoms also require immediate medical attention: New skin rash Stiff neck Persistent vomiting or diarrhea Severe headache/sore throat/ear pain Signs of dehydration (e.g., fewer wet diapers, dry mouth, no tears, sunken soft spot). Children of any age with repeating fevers (even if they only last a few hours) without other symptoms for more than seven days or who act or appear ill, even when the fever is reduced, must be seen promptly by a healthcare provider. Adults If you are an adult and have a fever, seek medical attention right away if you: Are pregnant Are recovering from a recent surgery or were recently hospitalized Are taking chemotherapy , steroids, or other drugs that weaken the immune system Think a tick may have bitten you Have a chronic health condition like diabetes, heart disease, or cancer Have recently returned from a trip abroad, namely from Africa, Asia, Latin America, or the Middle East Have fevers that recur or persist Go to your nearest emergency room if your fever is accompanied by one or more of the following symptoms: Skin rash Problems breathing Severe headache or neck pain/stiffness Seizure Feeling confused Severe or persistent vomiting or diarrhea Pain in the stomach, back, or sides Do Not Hesitate to Get Help If you (or your child) have a fever and are experiencing unusual or worrisome symptoms or have that gut instinct that something is wrong, don't hesitate to contact a healthcare provider or go to your nearest emergency room. Causes of Fever There are multiple potential causes of fever. Viral Infections are the most common cause. Examples include: The common cold The flu (influenza) COVID-19 Acute bronchitis Viral stomach flu (e.g., rotavirus in young children) Other causes include bacterial infections such as: Urinary tract infections (UTIs) Bacterial gastroenteritis (e.g., Salmonella ) Bacterial otitis media (middle ear infection) Skin infections (e.g., cellulitis ) Pneumonia (lung infection) Sometimes, fever is caused by a non-infectious condition such as: Autoimmune diseases (e.g., lupus or rheumatoid arthritis) Cancer Reaction to a medication, vaccine, or blood transfusion Acute pancreatitis (inflammation of the pancreas) Acute cholecystitis (inflammation of the gallbladder)
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Our website is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Ⓒ 2026 People Inc. — All rights reserved # Fever: What’s Considered Low, High, and Possibly Serious? By [Colleen Doherty, MD](https://www.verywellhealth.com/colleen-doherty-md-4021130) Updated on September 03, 2025 Medically reviewed by [Sameena Zahoor, MD](https://www.verywellhealth.com/sameena-zahoor-5221384) Table of Contents View All Table of Contents - [Normal Temperature](https://www.verywellhealth.com/fever-8685009#toc-what-is-considered-a-normal-body-temperature) - [Fever](https://www.verywellhealth.com/fever-8685009#toc-whats-considered-a-fever) - [At-Home](https://www.verywellhealth.com/fever-8685009#toc-how-to-break-a-fever-at-home) - [School or Work](https://www.verywellhealth.com/fever-8685009#toc-school-and-work-with-a-fever) - [When to See a Provider](https://www.verywellhealth.com/fever-8685009#toc-fever-symptoms-that-warrant-medical-attention) - [Causes of Fever](https://www.verywellhealth.com/fever-8685009#toc-causes-of-fever) ### Key Takeaways - If a baby under 3 months has a rectal temperature of 100.4 F or higher, seek medical help. - For children ages 3 months to 3 years, seek medical help if a rectal temperature of 100.4 F lasts more than three days, if they're acting sick or fussy, or if the temperature is 102 F or higher. - Older children and adults should get medical help for an oral temperature of 104 F or higher or if they have accompanying symptoms like rash, severe headache, or stiff neck. Fever is an elevation in the body's temperature. It's not a disease but rather a sign or response to something occurring within the body, most commonly an infection. Noninfectious conditions or scenarios like inflammatory diseases or medication reactions can also cause a fever. ![A parent reads a child's temperature on a digital thermometer.]() ![A parent reads a child's temperature on a digital thermometer.](https://www.verywellhealth.com/thmb/1E0vmct69wVrtph31TZkOFubGiM=/1500x0/filters:no_upscale\(\):max_bytes\(150000\):strip_icc\(\)/fever-GettyImages-605764583-7d9de1bdc27c4d259e1aa6407557cf75.jpg) John Fedele / Getty Images ## What Is Considered a Normal Body Temperature? To understand fever, it's important first to understand what a normal body temperature is. ### Normal Body Temperature Ranges There is no formal definition for a normal body temperature, although general ranges exist. Factors affecting body temperature include age, measurement site (e.g., mouth vs. rectum vs. underarm), and time of day. Body temperature is naturally at its lowest in the early morning and highest in the late afternoon. In adults, the average body temperature measured orally (by mouth) is 98.0 F (36.7 C), with an approximate range between 95.5 F and 99.9 F. In most babies and children, the normal body temperature range is between 97.7 F (36.5 C) and 99.5 F (37.5 C). Their slightly higher body temperature is attributed to their greater total surface area in relation to their body weight and higher metabolisms. ### Measurement Sites Sites on the body for measuring temperature include: - Mouth (oral): The tip of the [thermometer](https://www.verywellhealth.com/best-thermometers-5094134) is placed under the tongue and facing toward the back of the mouth. - [Rectum](https://www.verywellhealth.com/take-a-rectal-temperature-1298382) (rectal): A small amount of petroleum jelly is applied to the end of the thermometer, which is then placed one-half inch inside the anal canal. Rectal thermometers provide the best reading for babies under 3 months. - Armpit (axillary): The tip of the thermometer is placed on the skin in the armpit. This measurement method is invariably lower than the rectal or mouth temperature. - Ear (tympanic): The top of the ear is pulled back, and an infrared scanning device is gently placed in the ear canal. The device uses heat from the eardrum and surrounding tissue to detect body temperature. - Forehead (temporal): An infrared scanning device is slid or aimed across the forehead. It uses heat waves radiating off the forehead (temporal) artery to detect body temperature. ## What's Considered a Fever? The [hypothalamus](https://www.verywellhealth.com/hypothalamus-8646628) is a small gland in the brain that controls the body's temperature, like a thermostat. Fever is an increase in body temperature that occurs when the hypothalamus's set point is shifted upwards in response to inflammation or infection. Generally accepted ranges include the following: - In healthy babies younger than 3 months, a fever isa rectal temperature of 100.4 F or greater. - In children age 3 months to 36 months, a fever isa rectal temperature between 100.4 F and 102.2 F. - In older children and adults, a fever is an oral temperature ranging from 100.0 F to 103.0 F. Rectal temperatures should be taken for children under 4 years old, as they provide the most accurate reading. Oral temperatures are generally acceptable for children around 4 or 5 years old. Forehead thermometers may be used for all ages. Axillary and tympanic temperatures are not recommended, as they are unreliable in young children. ### Low-Grade Fever Temperature Range A low-grade fever generally indicates a body temperature that is slightly above normal. There is no formally defined range, but one research article categorized it as between 99.1 F and 100.4 F. In children, body temperatures between 99.5 F and 101.3 F are considered by some to be elevated. ### High Fever Temperature Range A high fever indicates a body temperature that is possibly serious or dangerous. Again, there is no formal definition, but typically, a high fever is 102.2 F or greater in babies 3 months and older and younger children. A high fever in older children and adults is a temperature of 102.4 F or greater. Fevers above 105.8 F are termed "hyperpyrexia" and can be seen with brain dysfunction, severe infections, or [brain bleeds](https://www.verywellhealth.com/a-subdural-hematoma-is-bleed-into-the-brain-1720023). An extremely high temperature above 105.8 F sometimes represents hyperthermia, which is different from a fever. Hyperthermia can be rapidly fatal and is caused by a malfunctioning of the body's ability to manage heat coming from the environment. Causes include: - Excessive clothing and bedding insulation in infants - Heatstroke - [Neuroleptic malignant syndrome](https://www.verywellhealth.com/neuroleptic-malignant-syndrome-overview-4175001) (a rare side effect associated with the use of antipsychotic drugs) ## How to Break a Fever at Home Many fevers can be safely treated at home with fluids and rest, assuming no symptoms or signs of a serious illness are present. ### Antipyretic Drugs Sometimes, fever-reducing medicines—called [antipyretic agents](https://www.verywellhealth.com/over-the-counter-pain-relievers-and-fever-reducers-770678)—are used to ease discomfort, especially if the fever is high or other symptoms related to the fever are present. These can include malaise (general feeling of being unwell), headache, and muscle aches. Antipyretic agents are also often indicated in individuals with underlying heart or lung diseases, as fever can increase heart and breathing rates. [Tylenol (acetaminophen)](https://www.verywellhealth.com/how-long-does-tylenol-acetaminophen-last-7500938) and the [nonsteroidal anti-inflammatory drug](https://www.verywellhealth.com/best-anti-inflammatory-medication-2548734) (NSAID) [ibuprofen](https://www.verywellhealth.com/ibuprofen-dosage-how-much-you-can-safely-take-8646449), sold under the brand names Advil or Motrin, are commonly used antipyretics. ### Take Precautions Take an antipyretic (or give your child) only under the guidance of a healthcare provider, as they do carry risks. Taking too much Tylenol can cause liver injury and damage. Likewise, too much ibuprofen and other NSAIDs can cause stomach bleeding and may need to be avoided in individuals with heart or kidney disease, high blood pressure (hypertension), or bleeding problems. This is why it is important to read the medication label carefully when giving these medications. Information on the label can help you determine the correct dose and frequency based on your child's weight. Also, the NSAID [aspirin](https://www.verywellhealth.com/nsaids-for-chronic-pain-2564481) should never be used in kids under 19, as it's associated with [Reye's syndrome](https://www.verywellhealth.com/reyes-syndrome-2861001)., a life-threatening condition. An antipyretic is often unnecessary in a child older than 3 months who has a rectal temperature less than 102 F (38.9 C), seems well, and is behaving like their usual selves. ### Cooling Therapies Cooling therapies—such as cooling blankets or cool-water sponge baths—can help reduce fever in adults with high fevers, but only when used concurrently with an antipyretic. This is because physical cooling of the body causes blood vessels in the skin to narrow, decreasing the body's ability to lose heat. Cooling therapies are not recommended in babies or children with a fever-related illness. ## School and Work With a Fever To prevent the spread of infection, a child or adult should be fever-free for 24 hours without the use of fever-reducing medications) and feel and appear well before returning to school, work, or other activities. ## Fever Symptoms That Warrant Medical Attention In many instances, seeing a healthcare provider or going to the emergency room is unnecessary for a fever, as the cause is often a viral infection that needs to run its course, typically three to five days. That said, certain factors, such as an ill-appearing child or adult, underlying medical conditions, or worrisome symptoms, warrant medical attention. ### Babies and Children According to the American Academy of Pediatrics and experts from UpToDate, seek medical attention in the following scenarios: - A baby less than 3 months of age with a rectal reading of 100.4 F (38 C) or higher, even if the baby looks well (avoid fever medication until speaking with the healthcare provider) - Children age 3 months to 3 years who have had a rectal reading of 100.4 F (38 C) or higher for more than one to three days or who appear ill or are fussy, unusually tired, clingy, or refuse to drink fluids - Children aged 3 months to 3 years who have a rectal reading of 102 F (38.9 C) or higher - Children of any age whose mouth/ear/rectal/forehead reading is 104 F (40 C) or higher or whose axillary (armpit) reading is 103 F (39.4 C) or higher - Children of any age who have a fever and are taking [steroids](https://www.verywellhealth.com/facts-about-corticosteroids-steroids-188358) and/or have a chronic medical condition (e.g., cancer or [sickle cell disease](https://www.verywellhealth.com/sickle-cell-anemia-2861015)) - Children of any age who have a [febrile seizure](https://www.verywellhealth.com/what-is-a-convulsion-4144876) - Children of any age who have been in a sweltering environment, like an overheated car In addition, infants and children with a fever and any of the following symptoms also require immediate medical attention: - New skin rash - Stiff neck - Persistent vomiting or diarrhea - Severe headache/sore throat/ear pain - [Signs of dehydration](https://www.verywellhealth.com/dehydration-symptoms-8662174) (e.g., fewer wet diapers, dry mouth, no tears, sunken soft spot). Children of any age with repeating fevers (even if they only last a few hours) without other symptoms for more than seven days or who act or appear ill, even when the fever is reduced, must be seen promptly by a healthcare provider. ### Adults If you are an adult and have a fever, seek medical attention right away if you: - Are pregnant - Are recovering from a recent surgery or were recently hospitalized - Are taking [chemotherapy](https://www.verywellhealth.com/chemotherapy-4014085), steroids, or other drugs that weaken the immune system - Think a [tick](https://www.verywellhealth.com/tick-bite-symptoms-5186154) may have bitten you - Have a chronic health condition like diabetes, heart disease, or cancer - Have recently returned from a trip abroad, namely from Africa, Asia, Latin America, or the Middle East - Have fevers that recur or persist Go to your nearest emergency room if your fever is accompanied by one or more of the following symptoms: - Skin rash - Problems breathing - Severe headache or neck pain/stiffness - Seizure - Feeling confused - Severe or persistent vomiting or diarrhea - Pain in the stomach, back, or sides ### Do Not Hesitate to Get Help If you (or your child) have a fever and are experiencing unusual or worrisome symptoms or have that gut instinct that something is wrong, don't hesitate to contact a healthcare provider or go to your nearest emergency room. ## Causes of Fever There are multiple potential causes of fever. Viral Infections are the most common cause. Examples include: - The [common cold](https://www.verywellhealth.com/cold-7152003) - The [flu](https://www.verywellhealth.com/flu-7109004) (influenza) - [COVID-19](https://www.verywellhealth.com/coronavirus-overview-4783291) - [Acute bronchitis](https://www.verywellhealth.com/symptoms-of-bronchitis-770332) - Viral [stomach flu](https://www.verywellhealth.com/stomach-flu-7104131) (e.g., rotavirus in young children) Other causes include bacterial infections such as: - [Urinary tract infections](https://www.verywellhealth.com/urinary-tract-infection-uti-7372902) (UTIs) - [Bacterial gastroenteritis](https://www.verywellhealth.com/bacterial-gastroenteritis-5219755) (e.g., Salmonella) - Bacterial [otitis media](https://www.verywellhealth.com/ear-infections-5092929) (middle ear infection) - Skin infections (e.g., [cellulitis](https://www.verywellhealth.com/what-is-cellulitis-1958753)) - [Pneumonia](https://www.verywellhealth.com/pneumonia-7151990) (lung infection) Sometimes, fever is caused by a non-infectious condition such as: - [Autoimmune diseases](https://www.verywellhealth.com/autoimmune-diseases-overview-3232654) (e.g., lupus or rheumatoid arthritis) - Cancer - Reaction to a medication, vaccine, or blood transfusion - Acute [pancreatitis](https://www.verywellhealth.com/acute-or-chronic-pancreatitis-symptoms-and-treatments-3520426) (inflammation of the pancreas) - Acute [cholecystitis](https://www.verywellhealth.com/cholecystitis-overview-4588159) (inflammation of the gallbladder) Read more: - [Health A-Z](https://www.verywellhealth.com/health-a-z-4014770) - [Cold & Flu](https://www.verywellhealth.com/cold-flu-overview-4581986) - [Symptoms](https://www.verywellhealth.com/cold-flu-symptoms-overview-4581984) 22 Sources Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our [editorial process](https://www.verywellhealth.com/verywell-editorial-process-4777042) to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. 1. Bush LM. [Fever](https://www.merckmanuals.com/professional/infectious-diseases/biology-of-infectious-disease/fever). Merck Manual Professional Version. 2. Speaker SL, Pfoh ER, Pappas MA, Hu B, Rothberg MB. [Oral temperature of noninfected hospitalized patients](https://doi.org/10.1001/jama.2021.1541). JAMA. 2021;325(18):1899-1901. doi:10.1001/jama.2021.1541 3. InformedHealth.org. [Overview: fever in children](https://www.ncbi.nlm.nih.gov/books/NBK279455/). 4. American Academy of Pediatrics. [Thermometers 101: how to check temperature during COVID-19 pandemic](https://publications.aap.org/aapnews/news/14385/Thermometers-101-How-to-check-temperature-during) 5. American Academy of Pediatrics. [Fever without fear: information for parents](https://www.healthychildren.org/English/health-issues/conditions/fever/Pages/Fever-Without-Fear.aspx). 6. Ward MA. [Fever in infants and children](https://www.uptodate.com/contents/fever-in-infants-and-children-pathophysiology-and-management). In: UpToDate, Edwards MS (Ed), UpToDate, Waltham, MA. 7. American Academy of Pediatrics. [How to take your child's temperature](https://www.healthychildren.org/English/health-issues/conditions/fever/Pages/How-to-Take-a-Childs-Temperature.aspx). 8. Islam MA, Kundu S, Alam SS, Hossan T, Kamal MA, Hassan R. [Prevalence and characteristics of fever in adult and paediatric patients with coronavirus disease 2019 (COVID-19): a systematic review and meta-analysis of 17515 patients](https://doi.org/10.1371/journal.pone.0249788). PLoS One. 2021;16(4):e0249788. doi:10.1371/journal.pone.0249788 9. KidsHealth. [Fever (high temperature) in kids](https://kidshealth.org/en/parents/fever.html). 10. Suwanwongse K, Shabarek N. [Hyperpyrexia in patients with COVID-19](https://doi.org/10.1002/jmv.26154). J Med Virol. 2020;92(11):2857-2862. doi:10.1002/jmv.26154 11. Samudra N, Figueroa S. [Intractable central hyperthermia in the setting of brainstem hemorrhage](https://doi.org/10.1089/ther.2016.0004). Ther Hypothermia Temp Manag. 2016;6(2):98-101. doi:10.1089/ther.2016.0004 12. Harvard Health Publishing. [Heat stroke (hyperthermia)](https://www.health.harvard.edu/a_to_z/heat-stroke-hyperthermia-a-to-z). 13. Bach V, Libert JP. [Hyperthermia and Heat Stress as Risk Factors for Sudden Infant Death Syndrome: A Narrative Review](https://dx.doi.org/10.3389/fped.2022.816136). Front Pediatr. 2022 Apr 15;10:816136. doi:10.3389/fped.2022.816136 14. Bush LM. [Fever in adults](https://www.merckmanuals.com/home/infections/biology-of-infectious-disease/fever-in-adults). Merck Manual Consumer Version. 15. National Institute of Diabetes and Digestive and Kidney Diseases. [Clinical and research information on drug-induced liver injury: acetaminophen](https://www.ncbi.nlm.nih.gov/books/NBK548162/). 16. DailyMed. [Label: ibuprofen tablet](https://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=faebc392-0fd9-4c71-8471-beba10dda022). 17. Barbi E, Marzuillo P, Neri E, Naviglio S, Krauss BS. [Fever in children: pearls and pitfalls](https://doi.org/10.3390/children4090081). Children (Basel). 2017;4(9):81. doi:10.3390/children4090081 18. Ward MA. [Patient education: fever in children (beyond the basics)](https://www.uptodate.com/contents/fever-in-children-beyond-the-basics/print). In: UpToDate, Edwards MS (Ed), UpToDate, Waltham, MA 19. Dinarello CA, Porat R. [Pathophysiology and treatment of fever in adults](https://www.uptodate.com/contents/pathophysiology-and-treatment-of-fever-in-adults). In: UpToDate, Spelman D (Ed), UpToDate, Waltham, MA. 20. Centers for Disease Control and Prevention. [Preventing the spread of respiratory viruses when you're sick](https://www.cdc.gov/respiratory-viruses/prevention/precautions-when-sick.html). 21. El-Radhi AS. [Fever in common infectious diseases](https://doi.org/10.1007/978-3-319-92336-9_5). Clinical Manual of Fever in Children. 2019:85–140. doi:10.1007/978-3-319-92336-9\_5 22. Steele GM, Franco-Paredes C, Chastain DB. [Noninfectious causes of fever in adults](https://doi.org/10.1097/01.NPR.0000531067.65817.7d). Nurse Pract. 2018;43(4):38-44. doi:10.1097/01.NPR.0000531067.65817.7d ![Colleen Doherty, MD]() ![Colleen Doherty, MD](https://www.verywellhealth.com/thmb/CwTTG7I9kjUMmZvYB3LFbSHFvIU=/144x144/filters:no_upscale\(\):max_bytes\(150000\):strip_icc\(\)/Colleen-Doherty-MD-660-9d8d5f15b5a8408d91816814d441735b.jpg) By [Colleen Doherty, MD](https://www.verywellhealth.com/colleen-doherty-md-4021130) Dr. Doherty is a board-certified internist and writer living with multiple sclerosis. She is based in Chicago. 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Readable Markdown	### Key Takeaways - If a baby under 3 months has a rectal temperature of 100.4 F or higher, seek medical help. - For children ages 3 months to 3 years, seek medical help if a rectal temperature of 100.4 F lasts more than three days, if they're acting sick or fussy, or if the temperature is 102 F or higher. - Older children and adults should get medical help for an oral temperature of 104 F or higher or if they have accompanying symptoms like rash, severe headache, or stiff neck. Fever is an elevation in the body's temperature. It's not a disease but rather a sign or response to something occurring within the body, most commonly an infection. Noninfectious conditions or scenarios like inflammatory diseases or medication reactions can also cause a fever. John Fedele / Getty Images ## What Is Considered a Normal Body Temperature? To understand fever, it's important first to understand what a normal body temperature is. ### Normal Body Temperature Ranges There is no formal definition for a normal body temperature, although general ranges exist. Factors affecting body temperature include age, measurement site (e.g., mouth vs. rectum vs. underarm), and time of day. Body temperature is naturally at its lowest in the early morning and highest in the late afternoon. In adults, the average body temperature measured orally (by mouth) is 98.0 F (36.7 C), with an approximate range between 95.5 F and 99.9 F. In most babies and children, the normal body temperature range is between 97.7 F (36.5 C) and 99.5 F (37.5 C). Their slightly higher body temperature is attributed to their greater total surface area in relation to their body weight and higher metabolisms. ### Measurement Sites Sites on the body for measuring temperature include: - Mouth (oral): The tip of the [thermometer](https://www.verywellhealth.com/best-thermometers-5094134) is placed under the tongue and facing toward the back of the mouth. - [Rectum](https://www.verywellhealth.com/take-a-rectal-temperature-1298382) (rectal): A small amount of petroleum jelly is applied to the end of the thermometer, which is then placed one-half inch inside the anal canal. Rectal thermometers provide the best reading for babies under 3 months. - Armpit (axillary): The tip of the thermometer is placed on the skin in the armpit. This measurement method is invariably lower than the rectal or mouth temperature. - Ear (tympanic): The top of the ear is pulled back, and an infrared scanning device is gently placed in the ear canal. The device uses heat from the eardrum and surrounding tissue to detect body temperature. - Forehead (temporal): An infrared scanning device is slid or aimed across the forehead. It uses heat waves radiating off the forehead (temporal) artery to detect body temperature. ## What's Considered a Fever? The [hypothalamus](https://www.verywellhealth.com/hypothalamus-8646628) is a small gland in the brain that controls the body's temperature, like a thermostat. Fever is an increase in body temperature that occurs when the hypothalamus's set point is shifted upwards in response to inflammation or infection. Generally accepted ranges include the following: - In healthy babies younger than 3 months, a fever isa rectal temperature of 100.4 F or greater. - In children age 3 months to 36 months, a fever isa rectal temperature between 100.4 F and 102.2 F. - In older children and adults, a fever is an oral temperature ranging from 100.0 F to 103.0 F. Rectal temperatures should be taken for children under 4 years old, as they provide the most accurate reading. Oral temperatures are generally acceptable for children around 4 or 5 years old. Forehead thermometers may be used for all ages. Axillary and tympanic temperatures are not recommended, as they are unreliable in young children. ### Low-Grade Fever Temperature Range A low-grade fever generally indicates a body temperature that is slightly above normal. There is no formally defined range, but one research article categorized it as between 99.1 F and 100.4 F. In children, body temperatures between 99.5 F and 101.3 F are considered by some to be elevated. ### High Fever Temperature Range A high fever indicates a body temperature that is possibly serious or dangerous. Again, there is no formal definition, but typically, a high fever is 102.2 F or greater in babies 3 months and older and younger children. A high fever in older children and adults is a temperature of 102.4 F or greater. Fevers above 105.8 F are termed "hyperpyrexia" and can be seen with brain dysfunction, severe infections, or [brain bleeds](https://www.verywellhealth.com/a-subdural-hematoma-is-bleed-into-the-brain-1720023). An extremely high temperature above 105.8 F sometimes represents hyperthermia, which is different from a fever. Hyperthermia can be rapidly fatal and is caused by a malfunctioning of the body's ability to manage heat coming from the environment. Causes include: - Excessive clothing and bedding insulation in infants - Heatstroke - [Neuroleptic malignant syndrome](https://www.verywellhealth.com/neuroleptic-malignant-syndrome-overview-4175001) (a rare side effect associated with the use of antipsychotic drugs) ## How to Break a Fever at Home Many fevers can be safely treated at home with fluids and rest, assuming no symptoms or signs of a serious illness are present. ### Antipyretic Drugs Sometimes, fever-reducing medicines—called [antipyretic agents](https://www.verywellhealth.com/over-the-counter-pain-relievers-and-fever-reducers-770678)—are used to ease discomfort, especially if the fever is high or other symptoms related to the fever are present. These can include malaise (general feeling of being unwell), headache, and muscle aches. Antipyretic agents are also often indicated in individuals with underlying heart or lung diseases, as fever can increase heart and breathing rates. [Tylenol (acetaminophen)](https://www.verywellhealth.com/how-long-does-tylenol-acetaminophen-last-7500938) and the [nonsteroidal anti-inflammatory drug](https://www.verywellhealth.com/best-anti-inflammatory-medication-2548734) (NSAID) [ibuprofen](https://www.verywellhealth.com/ibuprofen-dosage-how-much-you-can-safely-take-8646449), sold under the brand names Advil or Motrin, are commonly used antipyretics. ### Take Precautions Take an antipyretic (or give your child) only under the guidance of a healthcare provider, as they do carry risks. Taking too much Tylenol can cause liver injury and damage. Likewise, too much ibuprofen and other NSAIDs can cause stomach bleeding and may need to be avoided in individuals with heart or kidney disease, high blood pressure (hypertension), or bleeding problems. This is why it is important to read the medication label carefully when giving these medications. Information on the label can help you determine the correct dose and frequency based on your child's weight. Also, the NSAID [aspirin](https://www.verywellhealth.com/nsaids-for-chronic-pain-2564481) should never be used in kids under 19, as it's associated with [Reye's syndrome](https://www.verywellhealth.com/reyes-syndrome-2861001)., a life-threatening condition. An antipyretic is often unnecessary in a child older than 3 months who has a rectal temperature less than 102 F (38.9 C), seems well, and is behaving like their usual selves. ### Cooling Therapies Cooling therapies—such as cooling blankets or cool-water sponge baths—can help reduce fever in adults with high fevers, but only when used concurrently with an antipyretic. This is because physical cooling of the body causes blood vessels in the skin to narrow, decreasing the body's ability to lose heat. Cooling therapies are not recommended in babies or children with a fever-related illness. ## School and Work With a Fever To prevent the spread of infection, a child or adult should be fever-free for 24 hours without the use of fever-reducing medications) and feel and appear well before returning to school, work, or other activities. ## Fever Symptoms That Warrant Medical Attention In many instances, seeing a healthcare provider or going to the emergency room is unnecessary for a fever, as the cause is often a viral infection that needs to run its course, typically three to five days. That said, certain factors, such as an ill-appearing child or adult, underlying medical conditions, or worrisome symptoms, warrant medical attention. ### Babies and Children According to the American Academy of Pediatrics and experts from UpToDate, seek medical attention in the following scenarios: - A baby less than 3 months of age with a rectal reading of 100.4 F (38 C) or higher, even if the baby looks well (avoid fever medication until speaking with the healthcare provider) - Children age 3 months to 3 years who have had a rectal reading of 100.4 F (38 C) or higher for more than one to three days or who appear ill or are fussy, unusually tired, clingy, or refuse to drink fluids - Children aged 3 months to 3 years who have a rectal reading of 102 F (38.9 C) or higher - Children of any age whose mouth/ear/rectal/forehead reading is 104 F (40 C) or higher or whose axillary (armpit) reading is 103 F (39.4 C) or higher - Children of any age who have a fever and are taking [steroids](https://www.verywellhealth.com/facts-about-corticosteroids-steroids-188358) and/or have a chronic medical condition (e.g., cancer or [sickle cell disease](https://www.verywellhealth.com/sickle-cell-anemia-2861015)) - Children of any age who have a [febrile seizure](https://www.verywellhealth.com/what-is-a-convulsion-4144876) - Children of any age who have been in a sweltering environment, like an overheated car In addition, infants and children with a fever and any of the following symptoms also require immediate medical attention: - New skin rash - Stiff neck - Persistent vomiting or diarrhea - Severe headache/sore throat/ear pain - [Signs of dehydration](https://www.verywellhealth.com/dehydration-symptoms-8662174) (e.g., fewer wet diapers, dry mouth, no tears, sunken soft spot). Children of any age with repeating fevers (even if they only last a few hours) without other symptoms for more than seven days or who act or appear ill, even when the fever is reduced, must be seen promptly by a healthcare provider. ### Adults If you are an adult and have a fever, seek medical attention right away if you: - Are pregnant - Are recovering from a recent surgery or were recently hospitalized - Are taking [chemotherapy](https://www.verywellhealth.com/chemotherapy-4014085), steroids, or other drugs that weaken the immune system - Think a [tick](https://www.verywellhealth.com/tick-bite-symptoms-5186154) may have bitten you - Have a chronic health condition like diabetes, heart disease, or cancer - Have recently returned from a trip abroad, namely from Africa, Asia, Latin America, or the Middle East - Have fevers that recur or persist Go to your nearest emergency room if your fever is accompanied by one or more of the following symptoms: - Skin rash - Problems breathing - Severe headache or neck pain/stiffness - Seizure - Feeling confused - Severe or persistent vomiting or diarrhea - Pain in the stomach, back, or sides ### Do Not Hesitate to Get Help If you (or your child) have a fever and are experiencing unusual or worrisome symptoms or have that gut instinct that something is wrong, don't hesitate to contact a healthcare provider or go to your nearest emergency room. ## Causes of Fever There are multiple potential causes of fever. Viral Infections are the most common cause. Examples include: - The [common cold](https://www.verywellhealth.com/cold-7152003) - The [flu](https://www.verywellhealth.com/flu-7109004) (influenza) - [COVID-19](https://www.verywellhealth.com/coronavirus-overview-4783291) - [Acute bronchitis](https://www.verywellhealth.com/symptoms-of-bronchitis-770332) - Viral [stomach flu](https://www.verywellhealth.com/stomach-flu-7104131) (e.g., rotavirus in young children) Other causes include bacterial infections such as: - [Urinary tract infections](https://www.verywellhealth.com/urinary-tract-infection-uti-7372902) (UTIs) - [Bacterial gastroenteritis](https://www.verywellhealth.com/bacterial-gastroenteritis-5219755) (e.g., Salmonella) - Bacterial [otitis media](https://www.verywellhealth.com/ear-infections-5092929) (middle ear infection) - Skin infections (e.g., [cellulitis](https://www.verywellhealth.com/what-is-cellulitis-1958753)) - [Pneumonia](https://www.verywellhealth.com/pneumonia-7151990) (lung infection) Sometimes, fever is caused by a non-infectious condition such as: - [Autoimmune diseases](https://www.verywellhealth.com/autoimmune-diseases-overview-3232654) (e.g., lupus or rheumatoid arthritis) - Cancer - Reaction to a medication, vaccine, or blood transfusion - Acute [pancreatitis](https://www.verywellhealth.com/acute-or-chronic-pancreatitis-symptoms-and-treatments-3520426) (inflammation of the pancreas) - Acute [cholecystitis](https://www.verywellhealth.com/cholecystitis-overview-4588159) (inflammation of the gallbladder)
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