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Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 110 (from laksa012)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa110.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.medicalnewstoday.com/articles/fever-in-adults\')), getAhrefsUnparsedNoserviceFromURL(\'https://www.medicalnewstoday.com/articles/fever-in-adults\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/www.medicalnewstoday.com\/articles\/fever-in-adults","crawl_time":1769994415,"first_indexed_time":1585678042,"http_code":200,"src_unparsed":"com,medicalnewstoday!www,\/articles\/fever-in-adults s443","src_root_hash":"5853625527623639710","history_drop_reason":null,"meta_title":"Fever in adults: Symptoms, treatment, and when to seek help","meta_descriptions":["A fever is a natural response to an infection. However, it can be serious. Learn about the different types of fever and when to seek help."],"attrs_boilerpipe_text":"Severe illness can cause extremely high temperatures in adults that can be life threatening. A high-grade fever from a rectal measurement is typically 104.1–106.0°F (40–41.1°C).\nWhen certain pathogens, such as bacteria and viruses, enter the body, the immune system signals the body to increase its temperature in an attempt to destroy them.\nThis article will discuss how a\nfever\naffects an adult’s body and when it is cause for concern.\nIf a person is concerned about a fever or how they feel overall, they should talk to a doctor.\nShare on Pinterest\nDoctors consider a temperature above 104°F (40°C) to be a high-grade fever.\nAs a general rule, adults should consider seeking medical attention if their temperature reaches above\n104 °F (40°C)\n. Doctors consider this temperature to be a high-grade fever.\nHowever, a fever is not the only symptom a person has when they are ill. A person should consider other symptoms, such as vomiting, breathing issues, confusion, or how they feel overall when deciding whether they need medical attention.\nDoctors categorize a fever by the reading on the thermometer, how long the fever lasts, and whether it keeps going up and down.\nNormal body temperature can fluctuate. According to a\n2019 systematic\nreview, typical body temperatures vary according to a person’s age, and whether they take their temperature orally or rectally. The table below indicates a range of normal body temperatures.\nAges\nOral\n°F (°C)\nRectal\n°F (°C)\nMean temperature\n97.8 (36.5)\n98.6 (37.0)\nLess than 60 years of age\n98.1 (36.7)\n98.8 (37.1)\nOver 60 years of age\n97.5 (36.4)\n98.6 (37.0)\nIt is important to note that temperatures can fluctuate. A normal rectal body temperature ranges from\n98.6–100.4°F\n.\nMild or low-grade fever:\n100.4–102.2°F (38–39°C)\nModerate grade fever:\n102.2–104.0°F (39°C–40°C)\nHigh-grade fever:\n104.1–106.0°F (40°C–41.1°C)\nThese temperature values are rectal measurements, which doctors consider the most accurate.\nHowever, the article also emphasizes that doctors can better diagnose a person’s condition by considering their other symptoms rather than the severity of their temperature.\nSustained or continuous fever\nA sustained fever is when a person has a temperature above normal that does not fluctuate by more than\n1.5°F (1°C)\nfor 24 hours.\nCauses may include:\nGram-negative bacteria:\nThese are bacteria that can cause pneumonia, bloodstream infections, and surgical site infections.\nTyphoid\n:\nTyphoid is a bacterial infection that can cause fever.\nAcute bacterial meningitis:\nThis is a severe infection that requires emergency medical help.\nUrinary tract infection (UTI)\n:\nCystitis\nis an infection of the bladder, and\nurethritis\nis an infection of the urethra.\nIntermittent fever\nAn intermittent fever occurs when a person experiences a raised temperature for\nseveral hours\na day. The temperature then goes back to normal before spiking again.\nCommon causes may include:\nMalaria\n:\nThis is an infection that some mosquitoes transmit.\nTuberculosis (TB)\n:\nThis is an infection of the lungs.\nLymphoma\n:\nThis is a form of\ncancer\nthat begins in the cells.\nSepsis\n: This occurs when the body has an extreme reaction to an infection.\nRemittent fever\nThis is a daily fever that is always higher than normal but may fluctuate as much as\n3.6°F (2°C)\nthroughout the day.\nCommon causes may include:\nInfective\nendocarditis\n:\nThis is an infection of the endocardium, which is the membrane that lines the inside of the heart.\nRickettsiae infections:\nThis is an infection transmitted by ticks, mites, and lice.\nPeople who experience an internal temperature of\n104°F (40°C)\nand higher for prolonged periods can develop\nhyperthermia\n. For this reason, it is essential to try to keep a fever from becoming too high.\nPotential complications from a high-grade fever can include:\nseizures\nunsteadiness\nunconsciousness\nlethargy\ncoma\nA high-grade fever can also cause cognitive dysfunction, which affects a person’s memory, comprehension, reasoning, and problem-solving ability. Some people may also have difficulty paying attention.\nTypically, these symptoms are only\ntemporary,\nand most people recover. However, in extreme circumstances, some people experience permanent changes.\nFever is a\ncommon symptom\nof the novel coronavirus, known as COVID-19.\nAccording to a study published in the\nNew England Journal of Medicine\nin February 2020, data on 1,099 people in China who had COVID-19 showed that 43.8% had a fever on admission to the hospital. An estimated 88.7% developed a fever during their hospitalization.\nThe authors defined a fever as an axillary (armpit) temperature of 99.8°F (37.7°C) or higher.\nOther symptoms include:\na cough\nshortness of breath\nnausea\nvomiting\ndiarrhea\nIf a person suspects they may have COVID-19, they should call a doctor or health department for further testing.\nFor live updates on the latest developments regarding the novel coronavirus and COVID-19, click\nhere\n.\nA low-grade fever can be the body’s protective measure. Scientists are still in debate whether a person should treat a low-grade fever.\nHowever, if a person does have a fever or does not feel well, they could take fever-reducing medications, such as:\nacetaminophen\nibuprofen\naspirin\nAs a fever is typically a symptom of another condition, a person may require different treatments depending on the cause.\nIf a person has an underlying bacterial illness, a doctor may prescribe\nantibiotics\n. These can treat the infection, which can help reduce fever.\nOther steps a person can take to make themselves more comfortable include resting, drinking plenty of fluids, wearing loose clothing, and taking cool or lukewarm baths.\nThere are some steps a person can take to help prevent getting a fever:\nAlways cover the mouth and nose when sneezing and wash hands immediately after sneezing or coughing.\nRefrain from sharing personal items, such as utensils, cups, and even toothbrushes.\nTry not to touch the face. A person can easily transmit the pathogen from their face to their nose or mouth, which might allow the germs to enter the body.\nAvoid contact with people who are sick. This can help prevent the transmission of illness.\nMaintain good hygiene. Washing hands may help prevent bacteria and viruses from spreading.\nA fever is a protective mechanism for the body as the immune system works to fight against illness in a variety of ways.\nIf a person feels very unwell in addition to having a fever or they are already immunocompromised due to pre-existing conditions, they should seek medical attention.\nA person should also see their doctor if they have tried to control their fever at home, but over-the-counter medicines and other treatments are ineffective.\nA fever can become dangerous if it reaches 104°F (40°C) or higher.","attrs_markdown":"- Health Conditions\n  ### Health Conditions\n  - [Alzheimer's & Dementia](https:\/\/www.medicalnewstoday.com\/alzheimers-and-dementia)\n  - [Anxiety](https:\/\/www.medicalnewstoday.com\/anxiety)\n  - [Asthma & Allergies](https:\/\/www.medicalnewstoday.com\/asthma-and-allergies)\n  - [Atopic Dermatitis](https:\/\/www.medicalnewstoday.com\/program\/investigating-atopic-dermatitis)\n  - [Breast Cancer](https:\/\/www.medicalnewstoday.com\/breast-cancer)\n  - 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A high-grade fever from a rectal measurement is typically 104.1–106.0°F (40–41.1°C).\n\nWhen certain pathogens, such as bacteria and viruses, enter the body, the immune system signals the body to increase its temperature in an attempt to destroy them.\n\nThis article will discuss how a [fever](https:\/\/www.medicalnewstoday.com\/articles\/168266) affects an adult’s body and when it is cause for concern.\n\nIf a person is concerned about a fever or how they feel overall, they should talk to a doctor.\n\n## [When is a fever serious?]()\n![Adult woman in bed with a fever](https:\/\/i0.wp.com\/post.medicalnewstoday.com\/wp-content\/uploads\/sites\/3\/2020\/03\/GettyImages-1194729141edit-1024x575.jpg?w=1155&h=1528)\n\n[Share on Pinterest](https:\/\/www.pinterest.com\/pin\/create\/button\/?url=https%3A%2F%2Fwww.medicalnewstoday.com%2Farticles%2Ffever-in-adults&media=https%3A%2F%2Fpost.medicalnewstoday.com%2Fwp-content%2Fuploads%2Fsites%2F3%2F2020%2F03%2FGettyImages-1194729141edit-1024x575.jpg&description=Fever%20in%20adults%3A%20Symptoms%2C%20treatment%2C%20and%20when%20to%20seek%20help \"Share on Pinterest\")\n\nDoctors consider a temperature above 104°F (40°C) to be a high-grade fever.\n\nAs a general rule, adults should consider seeking medical attention if their temperature reaches above [104 °F (40°C)](https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC4944502\/). Doctors consider this temperature to be a high-grade fever.\n\nHowever, a fever is not the only symptom a person has when they are ill. A person should consider other symptoms, such as vomiting, breathing issues, confusion, or how they feel overall when deciding whether they need medical attention.\n\n## [Normal body temperatures]()\nDoctors categorize a fever by the reading on the thermometer, how long the fever lasts, and whether it keeps going up and down.\n\nNormal body temperature can fluctuate. According to a [2019 systematic](https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC6456186\/)review, typical body temperatures vary according to a person’s age, and whether they take their temperature orally or rectally. The table below indicates a range of normal body temperatures.\n\n|   |   |   |\n|---|---|---|\n| **Ages** | **Oral** °F (°C) | **Rectal** °F (°C) |\n| Mean temperature | 97\\.8 (36.5) | 98\\.6 (37.0) |\n| Less than 60 years of age | 98\\.1 (36.7) | 98\\.8 (37.1) |\n| Over 60 years of age | 97\\.5 (36.4) | 98\\.6 (37.0) |\n\nIt is important to note that temperatures can fluctuate. A normal rectal body temperature ranges from [98\\.6–100.4°F](https:\/\/www.sciencedirect.com\/science\/article\/pii\/S1876034111000256#bib0050).\n\n## [Types and causes of fever]()\nThe following are the classifications of body temperature ranges, according to an article in the *[Journal of Infection and Public Health](https:\/\/www.sciencedirect.com\/science\/article\/pii\/S1876034111000256#bib0050)*:\n\n- **Mild or low-grade fever:** 100\\.4–102.2°F (38–39°C)\n- **Moderate grade fever:** 102.2–104.0°F (39°C–40°C)\n- **High-grade fever:** 104\\.1–106.0°F (40°C–41.1°C)\n\nThese temperature values are rectal measurements, which doctors consider the most accurate.\n\nHowever, the article also emphasizes that doctors can better diagnose a person’s condition by considering their other symptoms rather than the severity of their temperature.\n\n### Sustained or continuous fever\nA sustained fever is when a person has a temperature above normal that does not fluctuate by more than [1\\.5°F (1°C)](https:\/\/www.sciencedirect.com\/science\/article\/pii\/S1876034111000256#bib0050) for 24 hours.\n\nCauses may include:\n\n- **Gram-negative bacteria:** These are bacteria that can cause pneumonia, bloodstream infections, and surgical site infections.\n- **[Typhoid](https:\/\/www.medicalnewstoday.com\/articles\/156859):** Typhoid is a bacterial infection that can cause fever.\n- **Acute bacterial meningitis:** This is a severe infection that requires emergency medical help.\n- **[Urinary tract infection (UTI)](https:\/\/www.medicalnewstoday.com\/articles\/189953):** [Cystitis](https:\/\/www.medicalnewstoday.com\/articles\/152997) is an infection of the bladder, and [urethritis](https:\/\/www.medicalnewstoday.com\/articles\/264903) is an infection of the urethra.\n### Intermittent fever\nAn intermittent fever occurs when a person experiences a raised temperature for [several hours](https:\/\/www.sciencedirect.com\/science\/article\/pii\/S1876034111000256#bib0050) a day. The temperature then goes back to normal before spiking again.\n\nCommon causes may include:\n\n- **[Malaria](https:\/\/www.medicalnewstoday.com\/articles\/150670):** This is an infection that some mosquitoes transmit.\n- **[Tuberculosis (TB)](https:\/\/www.medicalnewstoday.com\/articles\/8856):** This is an infection of the lungs.\n- **[Lymphoma](https:\/\/www.medicalnewstoday.com\/articles\/146136):** This is a form of [cancer](https:\/\/www.medicalnewstoday.com\/articles\/323648) that begins in the cells.\n- [**Sepsis**](https:\/\/www.medicalnewstoday.com\/articles\/305782): This occurs when the body has an extreme reaction to an infection.\n### Remittent fever\nThis is a daily fever that is always higher than normal but may fluctuate as much as [3\\.6°F (2°C)](https:\/\/www.sciencedirect.com\/science\/article\/pii\/S1876034111000256#bib0050) throughout the day.\n\nCommon causes may include:\n\n- **Infective [endocarditis](https:\/\/www.medicalnewstoday.com\/articles\/151016):** This is an infection of the endocardium, which is the membrane that lines the inside of the heart.\n- **Rickettsiae infections:** This is an infection transmitted by ticks, mites, and lice.\n\n## [Potential complications]()\nPeople who experience an internal temperature of [104°F (40°C)](https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC4944502\/) and higher for prolonged periods can develop [hyperthermia](https:\/\/www.medicalnewstoday.com\/articles\/320226). For this reason, it is essential to try to keep a fever from becoming too high.\n\nPotential complications from a high-grade fever can include:\n\n- seizures\n- unsteadiness\n- unconsciousness\n- lethargy\n- [coma](https:\/\/www.medicalnewstoday.com\/articles\/173655)\n\nA high-grade fever can also cause cognitive dysfunction, which affects a person’s memory, comprehension, reasoning, and problem-solving ability. Some people may also have difficulty paying attention.\n\nTypically, these symptoms are only [temporary,](https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC4944502\/)and most people recover. However, in extreme circumstances, some people experience permanent changes.\n\n## [Fever and COVID-19]()\nFever is a [common symptom](https:\/\/www.cdc.gov\/coronavirus\/2019-ncov\/symptoms-testing\/symptoms.html) of the novel coronavirus, known as COVID-19.\n\nAccording to a study published in the *[New England Journal of Medicine](https:\/\/www.nejm.org\/doi\/full\/10.1056\/NEJMoa2002032)* in February 2020, data on 1,099 people in China who had COVID-19 showed that 43.8% had a fever on admission to the hospital. An estimated 88.7% developed a fever during their hospitalization.\n\nThe authors defined a fever as an axillary (armpit) temperature of 99.8°F (37.7°C) or higher.\n\nOther symptoms include:\n\n- a cough\n- shortness of breath\n- nausea\n- vomiting\n- [diarrhea](https:\/\/www.medicalnewstoday.com\/articles\/158634)\n\nIf a person suspects they may have COVID-19, they should call a doctor or health department for further testing.   \n  \n***For live updates on the latest developments regarding the novel coronavirus and COVID-19, click [here](https:\/\/www.medicalnewstoday.com\/articles\/live-updates-coronavirus-covid-19).***\n\n## [Treatment]()\nA low-grade fever can be the body’s protective measure. Scientists are still in debate whether a person should treat a low-grade fever.\n\nHowever, if a person does have a fever or does not feel well, they could take fever-reducing medications, such as:\n\n- acetaminophen\n- ibuprofen\n- [aspirin](https:\/\/www.medicalnewstoday.com\/articles\/161255)\n\nAs a fever is typically a symptom of another condition, a person may require different treatments depending on the cause.\n\nIf a person has an underlying bacterial illness, a doctor may prescribe [antibiotics](https:\/\/www.medicalnewstoday.com\/articles\/10278). These can treat the infection, which can help reduce fever.\n\nOther steps a person can take to make themselves more comfortable include resting, drinking plenty of fluids, wearing loose clothing, and taking cool or lukewarm baths.\n\n## [Prevention]()\nThere are some steps a person can take to help prevent getting a fever:\n\n- Always cover the mouth and nose when sneezing and wash hands immediately after sneezing or coughing.\n- Refrain from sharing personal items, such as utensils, cups, and even toothbrushes.\n- Try not to touch the face. A person can easily transmit the pathogen from their face to their nose or mouth, which might allow the germs to enter the body.\n- Avoid contact with people who are sick. This can help prevent the transmission of illness.\n- Maintain good hygiene. Washing hands may help prevent bacteria and viruses from spreading.\n\n[Learn more about washing hands properly here.](https:\/\/www.medicalnewstoday.com\/articles\/proper-hand-washing)\n\n## [Summary]()\nA fever is a protective mechanism for the body as the immune system works to fight against illness in a variety of ways.\n\nIf a person feels very unwell in addition to having a fever or they are already immunocompromised due to pre-existing conditions, they should seek medical attention.\n\nA person should also see their doctor if they have tried to control their fever at home, but over-the-counter medicines and other treatments are ineffective.\n\nA fever can become dangerous if it reaches 104°F (40°C) or higher.\n\n- [Flu \/ Cold \/ SARS](https:\/\/www.medicalnewstoday.com\/categories\/flu-sars)\n- [Infectious Diseases \/ Bacteria \/ Viruses](https:\/\/www.medicalnewstoday.com\/categories\/infectious_diseases)\n- [COVID-19](https:\/\/www.medicalnewstoday.com\/categories\/covid-19)\n\n### How we reviewed this article:\nSources\n\nMedical News Today has strict sourcing guidelines and relies on peer-reviewed studies, academic research institutions, and medical journals and associations. We only use quality, credible sources to ensure content accuracy and integrity. You can learn more about how we ensure our content is accurate and current by reading our [editorial policy](https:\/\/www.medicalnewstoday.com\/articles\/process).\n\n- Bacterial meningitis. (2019).  \n  <https:\/\/www.cdc.gov\/meningitis\/bacterial.html>\n- Basic TB facts. (2016).  \n  <https:\/\/www.cdc.gov\/tb\/topic\/basics\/default.htm>\n- Geneva, I. I., *et al.* (2019). Normal body temperature: A systematic review.  \n  <https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC6456186\/>\n- Gram-negative bacteria infections in healthcare settings. (2011).  \n  <https:\/\/www.cdc.gov\/hai\/organisms\/gram-negative-bacteria.html>\n- Guan, W., et al. (2020). Clinical characteristics of coronavirus disease 2019 in China.  \n  <https:\/\/www.nejm.org\/doi\/full\/10.1056\/NEJMoa2002032>\n- Mackowiak, P., et al. (1992). A critical appraisal of 98.6 degrees Fahrenheit, the upper limit of the normal body temperature, and other legacies of Carl Reinhold August Wunderlich.  \n  <https:\/\/jamanetwork.com\/journals\/jama\/article-abstract\/400116>\n- Malaria. (2019).  \n  <https:\/\/www.cdc.gov\/parasites\/malaria\/index.html>\n- Ogoina, D. (2011). Fever, fever patterns, and diseases called 'fever' - a review.  \n  <https:\/\/www.sciencedirect.com\/science\/article\/pii\/S1876034111000256#bib0050>\n- Phipps, M. S., et al. (2011). Epidemiology and outcomes of fever burden among patients with acute ischemic stroke.  \n  <https:\/\/www.ahajournals.org\/doi\/pdf\/10.1161\/STROKEAHA.111.621425>\n- Steele, G., et al. (2018). Noninfectious causes of fever in adults.  \n  <https:\/\/journals.lww.com\/tnpj\/Fulltext\/2018\/04000\/Noninfectious_causes_of_fever_in_adults.6.aspx>\n- Symptoms of coronavirus. (2020).  \n  <https:\/\/www.cdc.gov\/coronavirus\/2019-ncov\/symptoms-testing\/symptoms.html>\n- Typhoid fever. (n.d.).  \n  <https:\/\/wwwnc.cdc.gov\/travel\/diseases\/typhoid>\n- Urinary tract infections (UTIs). (n.d.).  \n  <https:\/\/www.plannedparenthood.org\/learn\/health-and-wellness\/urinary-tract-infections-utis>\n\nShare this article\n\n![](https:\/\/i0.wp.com\/post.medicalnewstoday.com\/wp-content\/uploads\/sites\/3\/2019\/12\/alana-biggers-1.png?w=105&h=105)\n\n[Medically reviewed]() by [Alana Biggers, M.D., MPH]() — Written by [Rachel Nall, MSN, CRNA]()  on March 31, 2020\n\n## Latest news\n- [Two days of oatmeal may help reduce 'bad' cholesterol levels, study finds](https:\/\/www.medicalnewstoday.com\/articles\/two-days-oatmeal-reduce-ldl-cholesterol-levels-study)\n- [Is sleep the missing piece in mental health?](https:\/\/www.medicalnewstoday.com\/articles\/is-sleep-the-missing-piece-in-mental-health)\n- [Is this why dementia affects more women? How menopause alters the brain](https:\/\/www.medicalnewstoday.com\/articles\/dementia-menopause-brain-health-gray-matter-memory-loss)\n- [Low dose aspirin does not reduce cancer risk in older adults, long-term study finds](https:\/\/www.medicalnewstoday.com\/articles\/low-dose-aspirin-does-not-reduce-cancer-risk-in-older-adults)\n- [Can treating rheumatoid arthritis before it sets in help delay its onset?](https:\/\/www.medicalnewstoday.com\/articles\/pretreatment-rheumatoid-arthritis-onset-delay-4-years)\n\n### Related Coverage\n- [What are the best home remedies for fever?](https:\/\/www.medicalnewstoday.com\/articles\/326925?utm_source=ReadNext)\n  \n  Medically reviewed by [Kevin Martinez, M.D.](https:\/\/www.medicalnewstoday.com\/reviewers)\n  \n  [A fever is an uncomfortable symptom of infection or illness. Learn about the best home remedies for fever in children and adults here.](https:\/\/www.medicalnewstoday.com\/articles\/326925?utm_source=ReadNext)\n  \n  [READ MORE](https:\/\/www.medicalnewstoday.com\/articles\/326925?utm_source=ReadNext)\n- [How dangerous is a fever in toddlers, and when to seek help](https:\/\/www.medicalnewstoday.com\/articles\/fever-in-toddlers?utm_source=ReadNext)\n  \n  Medically reviewed by [Karen Gill, M.D.](https:\/\/www.medicalnewstoday.com\/reviewers)\n  \n  [Fever in toddlers normally resolves without treatment. However, some situations warrant medical attention. Learn more about when to seek help here.](https:\/\/www.medicalnewstoday.com\/articles\/fever-in-toddlers?utm_source=ReadNext)\n  \n  [READ MORE](https:\/\/www.medicalnewstoday.com\/articles\/fever-in-toddlers?utm_source=ReadNext)\n- [What to know about fever in babies](https:\/\/www.medicalnewstoday.com\/articles\/324660?utm_source=ReadNext)\n  \n  Medically reviewed by [Karen Gill, M.D.](https:\/\/www.medicalnewstoday.com\/reviewers)\n  \n  [Fever in a baby is a sign that their body is fighting off infection. In this article, we look at how to identify fever in a baby, common causes, and…](https:\/\/www.medicalnewstoday.com\/articles\/324660?utm_source=ReadNext)\n  \n  [READ MORE](https:\/\/www.medicalnewstoday.com\/articles\/324660?utm_source=ReadNext)\n- [Ilaris side effects: What you should know](https:\/\/www.medicalnewstoday.com\/articles\/drugs-ilaris-side-effects?utm_source=ReadNext)\n  \n  [Ilaris, which treats conditions including Still’s disease, can cause side effects such as unexpected weight gain. Learn about side effects and how to…](https:\/\/www.medicalnewstoday.com\/articles\/drugs-ilaris-side-effects?utm_source=ReadNext)\n  \n  [READ MORE](https:\/\/www.medicalnewstoday.com\/articles\/drugs-ilaris-side-effects?utm_source=ReadNext)\n- [Ilaris dosage](https:\/\/www.medicalnewstoday.com\/articles\/drugs-ilaris-dosage?utm_source=ReadNext)\n  \n  [Ilaris is used to treat certain periodic fever conditions and Still's disease. Find out what the recommended dosages are, how the drug is given, and…](https:\/\/www.medicalnewstoday.com\/articles\/drugs-ilaris-dosage?utm_source=ReadNext)\n  \n  [READ MORE](https:\/\/www.medicalnewstoday.com\/articles\/drugs-ilaris-dosage?utm_source=ReadNext)\n\n© 2026 Healthline Media UK Ltd, London, UK. All rights reserved. MNT is the registered trade mark of Healthline Media. Healthline Media is an RVO Health Company. Any medical information published on this website is not intended as a substitute for informed medical advice and you should not take any action before consulting with a healthcare professional. 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MNT is the registered trade mark of Healthline Media. Healthline Media is an RVO Health Company. Any medical information published on this website is not intended as a substitute for informed medical advice and you should not take any action before consulting with a healthcare professional. [See additional information](https:\/\/www.medicalnewstoday.com\/about\/additional-information).\n\n© 2026 Healthline Media UK Ltd, London, UK. All rights reserved. MNT is the registered trade mark of Healthline Media. Healthline Media is an RVO Health Company. Any medical information published on this website is not intended as a substitute for informed medical advice and you should not take any action before consulting with a healthcare professional. [See additional information](https:\/\/www.medicalnewstoday.com\/about\/additional-information).\n\n[About](https:\/\/www.healthlinemedia.com\/?utm_source=medicalnewstoday.com&utm_medium=site&utm_campaign=footer&utm_content=about)[Careers](https:\/\/rvohealth.com\/careers)[Advertise with us](https:\/\/www.healthlinemedia.com\/advertise?utm_source=medicalnewstoday.com&utm_medium=site&utm_campaign=footer&utm_content=advertise)\n\nOUR BRANDS\n\n[Healthline](https:\/\/www.healthline.com\/)[Medical News Today](https:\/\/www.medicalnewstoday.com\/)[Greatist](https:\/\/greatist.com\/)[Psych Central](https:\/\/psychcentral.com\/)[Bezzy](https:\/\/bezzy.com\/)\n\n![](http:\/\/b.scorecardresearch.com\/p?c1=2&c2=38584006&cv=3.9&cj=1&comscorekw=main)","attrs_readable_markdown":"Severe illness can cause extremely high temperatures in adults that can be life threatening. A high-grade fever from a rectal measurement is typically 104.1–106.0°F (40–41.1°C).\n\nWhen certain pathogens, such as bacteria and viruses, enter the body, the immune system signals the body to increase its temperature in an attempt to destroy them.\n\nThis article will discuss how a [fever](https:\/\/www.medicalnewstoday.com\/articles\/168266) affects an adult’s body and when it is cause for concern.\n\nIf a person is concerned about a fever or how they feel overall, they should talk to a doctor.\n\n![Adult woman in bed with a fever](https:\/\/i0.wp.com\/post.medicalnewstoday.com\/wp-content\/uploads\/sites\/3\/2020\/03\/GettyImages-1194729141edit-1024x575.jpg?w=1155&h=1528)\n\n[Share on Pinterest](https:\/\/www.pinterest.com\/pin\/create\/button\/?url=https%3A%2F%2Fwww.medicalnewstoday.com%2Farticles%2Ffever-in-adults&media=https%3A%2F%2Fpost.medicalnewstoday.com%2Fwp-content%2Fuploads%2Fsites%2F3%2F2020%2F03%2FGettyImages-1194729141edit-1024x575.jpg&description=Fever%20in%20adults%3A%20Symptoms%2C%20treatment%2C%20and%20when%20to%20seek%20help \"Share on Pinterest\")\n\nDoctors consider a temperature above 104°F (40°C) to be a high-grade fever.\n\nAs a general rule, adults should consider seeking medical attention if their temperature reaches above [104 °F (40°C)](https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC4944502\/). Doctors consider this temperature to be a high-grade fever.\n\nHowever, a fever is not the only symptom a person has when they are ill. A person should consider other symptoms, such as vomiting, breathing issues, confusion, or how they feel overall when deciding whether they need medical attention.\n\nDoctors categorize a fever by the reading on the thermometer, how long the fever lasts, and whether it keeps going up and down.\n\nNormal body temperature can fluctuate. According to a [2019 systematic](https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC6456186\/)review, typical body temperatures vary according to a person’s age, and whether they take their temperature orally or rectally. The table below indicates a range of normal body temperatures.\n\n|   |   |   |\n|---|---|---|\n| **Ages** | **Oral** °F (°C) | **Rectal** °F (°C) |\n| Mean temperature | 97\\.8 (36.5) | 98\\.6 (37.0) |\n| Less than 60 years of age | 98\\.1 (36.7) | 98\\.8 (37.1) |\n| Over 60 years of age | 97\\.5 (36.4) | 98\\.6 (37.0) |\n\nIt is important to note that temperatures can fluctuate. A normal rectal body temperature ranges from [98\\.6–100.4°F](https:\/\/www.sciencedirect.com\/science\/article\/pii\/S1876034111000256#bib0050).\n\n- **Mild or low-grade fever:** 100\\.4–102.2°F (38–39°C)\n- **Moderate grade fever:** 102.2–104.0°F (39°C–40°C)\n- **High-grade fever:** 104\\.1–106.0°F (40°C–41.1°C)\n\nThese temperature values are rectal measurements, which doctors consider the most accurate.\n\nHowever, the article also emphasizes that doctors can better diagnose a person’s condition by considering their other symptoms rather than the severity of their temperature.\n\nSustained or continuous fever\n\nA sustained fever is when a person has a temperature above normal that does not fluctuate by more than [1\\.5°F (1°C)](https:\/\/www.sciencedirect.com\/science\/article\/pii\/S1876034111000256#bib0050) for 24 hours.\n\nCauses may include:\n\n- **Gram-negative bacteria:** These are bacteria that can cause pneumonia, bloodstream infections, and surgical site infections.\n- **[Typhoid](https:\/\/www.medicalnewstoday.com\/articles\/156859):** Typhoid is a bacterial infection that can cause fever.\n- **Acute bacterial meningitis:** This is a severe infection that requires emergency medical help.\n- **[Urinary tract infection (UTI)](https:\/\/www.medicalnewstoday.com\/articles\/189953):** [Cystitis](https:\/\/www.medicalnewstoday.com\/articles\/152997) is an infection of the bladder, and [urethritis](https:\/\/www.medicalnewstoday.com\/articles\/264903) is an infection of the urethra.\n\nIntermittent fever\n\nAn intermittent fever occurs when a person experiences a raised temperature for [several hours](https:\/\/www.sciencedirect.com\/science\/article\/pii\/S1876034111000256#bib0050) a day. The temperature then goes back to normal before spiking again.\n\nCommon causes may include:\n\n- **[Malaria](https:\/\/www.medicalnewstoday.com\/articles\/150670):** This is an infection that some mosquitoes transmit.\n- **[Tuberculosis (TB)](https:\/\/www.medicalnewstoday.com\/articles\/8856):** This is an infection of the lungs.\n- **[Lymphoma](https:\/\/www.medicalnewstoday.com\/articles\/146136):** This is a form of [cancer](https:\/\/www.medicalnewstoday.com\/articles\/323648) that begins in the cells.\n- [**Sepsis**](https:\/\/www.medicalnewstoday.com\/articles\/305782): This occurs when the body has an extreme reaction to an infection.\n\nRemittent fever\n\nThis is a daily fever that is always higher than normal but may fluctuate as much as [3\\.6°F (2°C)](https:\/\/www.sciencedirect.com\/science\/article\/pii\/S1876034111000256#bib0050) throughout the day.\n\nCommon causes may include:\n\n- **Infective [endocarditis](https:\/\/www.medicalnewstoday.com\/articles\/151016):** This is an infection of the endocardium, which is the membrane that lines the inside of the heart.\n- **Rickettsiae infections:** This is an infection transmitted by ticks, mites, and lice.\n\nPeople who experience an internal temperature of [104°F (40°C)](https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC4944502\/) and higher for prolonged periods can develop [hyperthermia](https:\/\/www.medicalnewstoday.com\/articles\/320226). For this reason, it is essential to try to keep a fever from becoming too high.\n\nPotential complications from a high-grade fever can include:\n\n- seizures\n- unsteadiness\n- unconsciousness\n- lethargy\n- [coma](https:\/\/www.medicalnewstoday.com\/articles\/173655)\n\nA high-grade fever can also cause cognitive dysfunction, which affects a person’s memory, comprehension, reasoning, and problem-solving ability. Some people may also have difficulty paying attention.\n\nTypically, these symptoms are only [temporary,](https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC4944502\/)and most people recover. However, in extreme circumstances, some people experience permanent changes.\n\nFever is a [common symptom](https:\/\/www.cdc.gov\/coronavirus\/2019-ncov\/symptoms-testing\/symptoms.html) of the novel coronavirus, known as COVID-19.\n\nAccording to a study published in the *[New England Journal of Medicine](https:\/\/www.nejm.org\/doi\/full\/10.1056\/NEJMoa2002032)* in February 2020, data on 1,099 people in China who had COVID-19 showed that 43.8% had a fever on admission to the hospital. An estimated 88.7% developed a fever during their hospitalization.\n\nThe authors defined a fever as an axillary (armpit) temperature of 99.8°F (37.7°C) or higher.\n\nOther symptoms include:\n\n- a cough\n- shortness of breath\n- nausea\n- vomiting\n- [diarrhea](https:\/\/www.medicalnewstoday.com\/articles\/158634)\n\nIf a person suspects they may have COVID-19, they should call a doctor or health department for further testing.\n\n***For live updates on the latest developments regarding the novel coronavirus and COVID-19, click [here](https:\/\/www.medicalnewstoday.com\/articles\/live-updates-coronavirus-covid-19).***\n\nA low-grade fever can be the body’s protective measure. Scientists are still in debate whether a person should treat a low-grade fever.\n\nHowever, if a person does have a fever or does not feel well, they could take fever-reducing medications, such as:\n\n- acetaminophen\n- ibuprofen\n- [aspirin](https:\/\/www.medicalnewstoday.com\/articles\/161255)\n\nAs a fever is typically a symptom of another condition, a person may require different treatments depending on the cause.\n\nIf a person has an underlying bacterial illness, a doctor may prescribe [antibiotics](https:\/\/www.medicalnewstoday.com\/articles\/10278). These can treat the infection, which can help reduce fever.\n\nOther steps a person can take to make themselves more comfortable include resting, drinking plenty of fluids, wearing loose clothing, and taking cool or lukewarm baths.\n\nThere are some steps a person can take to help prevent getting a fever:\n\n- Always cover the mouth and nose when sneezing and wash hands immediately after sneezing or coughing.\n- Refrain from sharing personal items, such as utensils, cups, and even toothbrushes.\n- Try not to touch the face. A person can easily transmit the pathogen from their face to their nose or mouth, which might allow the germs to enter the body.\n- Avoid contact with people who are sick. This can help prevent the transmission of illness.\n- Maintain good hygiene. Washing hands may help prevent bacteria and viruses from spreading.\n\nA fever is a protective mechanism for the body as the immune system works to fight against illness in a variety of ways.\n\nIf a person feels very unwell in addition to having a fever or they are already immunocompromised due to pre-existing conditions, they should seek medical attention.\n\nA person should also see their doctor if they have tried to control their fever at home, but over-the-counter medicines and other treatments are ineffective.\n\nA fever can become dangerous if it reaches 104°F (40°C) or higher.","meta_canonical":null}

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Boilerpipe Text	Severe illness can cause extremely high temperatures in adults that can be life threatening. A high-grade fever from a rectal measurement is typically 104.1–106.0°F (40–41.1°C). When certain pathogens, such as bacteria and viruses, enter the body, the immune system signals the body to increase its temperature in an attempt to destroy them. This article will discuss how a fever affects an adult’s body and when it is cause for concern. If a person is concerned about a fever or how they feel overall, they should talk to a doctor. Share on Pinterest Doctors consider a temperature above 104°F (40°C) to be a high-grade fever. As a general rule, adults should consider seeking medical attention if their temperature reaches above 104 °F (40°C) . Doctors consider this temperature to be a high-grade fever. However, a fever is not the only symptom a person has when they are ill. A person should consider other symptoms, such as vomiting, breathing issues, confusion, or how they feel overall when deciding whether they need medical attention. Doctors categorize a fever by the reading on the thermometer, how long the fever lasts, and whether it keeps going up and down. Normal body temperature can fluctuate. According to a 2019 systematic review, typical body temperatures vary according to a person’s age, and whether they take their temperature orally or rectally. The table below indicates a range of normal body temperatures. Ages Oral °F (°C) Rectal °F (°C) Mean temperature 97.8 (36.5) 98.6 (37.0) Less than 60 years of age 98.1 (36.7) 98.8 (37.1) Over 60 years of age 97.5 (36.4) 98.6 (37.0) It is important to note that temperatures can fluctuate. A normal rectal body temperature ranges from 98.6–100.4°F . Mild or low-grade fever: 100.4–102.2°F (38–39°C) Moderate grade fever: 102.2–104.0°F (39°C–40°C) High-grade fever: 104.1–106.0°F (40°C–41.1°C) These temperature values are rectal measurements, which doctors consider the most accurate. However, the article also emphasizes that doctors can better diagnose a person’s condition by considering their other symptoms rather than the severity of their temperature. Sustained or continuous fever A sustained fever is when a person has a temperature above normal that does not fluctuate by more than 1.5°F (1°C) for 24 hours. Causes may include: Gram-negative bacteria: These are bacteria that can cause pneumonia, bloodstream infections, and surgical site infections. Typhoid : Typhoid is a bacterial infection that can cause fever. Acute bacterial meningitis: This is a severe infection that requires emergency medical help. Urinary tract infection (UTI) : Cystitis is an infection of the bladder, and urethritis is an infection of the urethra. Intermittent fever An intermittent fever occurs when a person experiences a raised temperature for several hours a day. The temperature then goes back to normal before spiking again. Common causes may include: Malaria : This is an infection that some mosquitoes transmit. Tuberculosis (TB) : This is an infection of the lungs. Lymphoma : This is a form of cancer that begins in the cells. Sepsis : This occurs when the body has an extreme reaction to an infection. Remittent fever This is a daily fever that is always higher than normal but may fluctuate as much as 3.6°F (2°C) throughout the day. Common causes may include: Infective endocarditis : This is an infection of the endocardium, which is the membrane that lines the inside of the heart. Rickettsiae infections: This is an infection transmitted by ticks, mites, and lice. People who experience an internal temperature of 104°F (40°C) and higher for prolonged periods can develop hyperthermia . For this reason, it is essential to try to keep a fever from becoming too high. Potential complications from a high-grade fever can include: seizures unsteadiness unconsciousness lethargy coma A high-grade fever can also cause cognitive dysfunction, which affects a person’s memory, comprehension, reasoning, and problem-solving ability. Some people may also have difficulty paying attention. Typically, these symptoms are only temporary, and most people recover. However, in extreme circumstances, some people experience permanent changes. Fever is a common symptom of the novel coronavirus, known as COVID-19. According to a study published in the New England Journal of Medicine in February 2020, data on 1,099 people in China who had COVID-19 showed that 43.8% had a fever on admission to the hospital. An estimated 88.7% developed a fever during their hospitalization. The authors defined a fever as an axillary (armpit) temperature of 99.8°F (37.7°C) or higher. Other symptoms include: a cough shortness of breath nausea vomiting diarrhea If a person suspects they may have COVID-19, they should call a doctor or health department for further testing. For live updates on the latest developments regarding the novel coronavirus and COVID-19, click here . A low-grade fever can be the body’s protective measure. Scientists are still in debate whether a person should treat a low-grade fever. However, if a person does have a fever or does not feel well, they could take fever-reducing medications, such as: acetaminophen ibuprofen aspirin As a fever is typically a symptom of another condition, a person may require different treatments depending on the cause. If a person has an underlying bacterial illness, a doctor may prescribe antibiotics . These can treat the infection, which can help reduce fever. Other steps a person can take to make themselves more comfortable include resting, drinking plenty of fluids, wearing loose clothing, and taking cool or lukewarm baths. There are some steps a person can take to help prevent getting a fever: Always cover the mouth and nose when sneezing and wash hands immediately after sneezing or coughing. Refrain from sharing personal items, such as utensils, cups, and even toothbrushes. Try not to touch the face. A person can easily transmit the pathogen from their face to their nose or mouth, which might allow the germs to enter the body. Avoid contact with people who are sick. This can help prevent the transmission of illness. Maintain good hygiene. Washing hands may help prevent bacteria and viruses from spreading. A fever is a protective mechanism for the body as the immune system works to fight against illness in a variety of ways. If a person feels very unwell in addition to having a fever or they are already immunocompromised due to pre-existing conditions, they should seek medical attention. A person should also see their doctor if they have tried to control their fever at home, but over-the-counter medicines and other treatments are ineffective. A fever can become dangerous if it reaches 104°F (40°C) or higher.
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[Bezzy Psoriasis](https://www.bezzypsoriasis.com/?utm_source=mnt&utm_medium=nav-bar-connect) ### Follow Us Subscribe # When is a fever in adults serious? ![](https://i0.wp.com/post.medicalnewstoday.com/wp-content/uploads/sites/3/2019/12/alana-biggers-1.png?w=105&h=105) [Medically reviewed]() by [Alana Biggers, M.D., MPH]() — Written by [Rachel Nall, MSN, CRNA]() on March 31, 2020 - [When to seek help](https://www.medicalnewstoday.com/articles/fever-in-adults#when-to-seek-help) - [Normal](https://www.medicalnewstoday.com/articles/fever-in-adults#normal) - [Types and causes](https://www.medicalnewstoday.com/articles/fever-in-adults#types-and-causes) - [Complications](https://www.medicalnewstoday.com/articles/fever-in-adults#complications) - [COVID-19](https://www.medicalnewstoday.com/articles/fever-in-adults#covid-19) - [Treatment](https://www.medicalnewstoday.com/articles/fever-in-adults#treatment) - [Prevention](https://www.medicalnewstoday.com/articles/fever-in-adults#prevention) - [Summary](https://www.medicalnewstoday.com/articles/fever-in-adults#summary) Severe illness can cause extremely high temperatures in adults that can be life threatening. A high-grade fever from a rectal measurement is typically 104.1–106.0°F (40–41.1°C). When certain pathogens, such as bacteria and viruses, enter the body, the immune system signals the body to increase its temperature in an attempt to destroy them. This article will discuss how a [fever](https://www.medicalnewstoday.com/articles/168266) affects an adult’s body and when it is cause for concern. If a person is concerned about a fever or how they feel overall, they should talk to a doctor. ## [When is a fever serious?]() ![Adult woman in bed with a fever](https://i0.wp.com/post.medicalnewstoday.com/wp-content/uploads/sites/3/2020/03/GettyImages-1194729141edit-1024x575.jpg?w=1155&h=1528) [Share on Pinterest](https://www.pinterest.com/pin/create/button/?url=https%3A%2F%2Fwww.medicalnewstoday.com%2Farticles%2Ffever-in-adults&media=https%3A%2F%2Fpost.medicalnewstoday.com%2Fwp-content%2Fuploads%2Fsites%2F3%2F2020%2F03%2FGettyImages-1194729141edit-1024x575.jpg&description=Fever%20in%20adults%3A%20Symptoms%2C%20treatment%2C%20and%20when%20to%20seek%20help "Share on Pinterest") Doctors consider a temperature above 104°F (40°C) to be a high-grade fever. As a general rule, adults should consider seeking medical attention if their temperature reaches above [104 °F (40°C)](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4944502/). Doctors consider this temperature to be a high-grade fever. However, a fever is not the only symptom a person has when they are ill. A person should consider other symptoms, such as vomiting, breathing issues, confusion, or how they feel overall when deciding whether they need medical attention. ## [Normal body temperatures]() Doctors categorize a fever by the reading on the thermometer, how long the fever lasts, and whether it keeps going up and down. Normal body temperature can fluctuate. According to a [2019 systematic](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6456186/)review, typical body temperatures vary according to a person’s age, and whether they take their temperature orally or rectally. The table below indicates a range of normal body temperatures. \| \| \| \| \|---\|---\|---\| \| Ages \| Oral °F (°C) \| Rectal °F (°C) \| \| Mean temperature \| 97\.8 (36.5) \| 98\.6 (37.0) \| \| Less than 60 years of age \| 98\.1 (36.7) \| 98\.8 (37.1) \| \| Over 60 years of age \| 97\.5 (36.4) \| 98\.6 (37.0) \| It is important to note that temperatures can fluctuate. A normal rectal body temperature ranges from [98\.6–100.4°F](https://www.sciencedirect.com/science/article/pii/S1876034111000256#bib0050). ## [Types and causes of fever]() The following are the classifications of body temperature ranges, according to an article in the [Journal of Infection and Public Health](https://www.sciencedirect.com/science/article/pii/S1876034111000256#bib0050): - Mild or low-grade fever: 100\.4–102.2°F (38–39°C) - Moderate grade fever: 102.2–104.0°F (39°C–40°C) - High-grade fever: 104\.1–106.0°F (40°C–41.1°C) These temperature values are rectal measurements, which doctors consider the most accurate. However, the article also emphasizes that doctors can better diagnose a person’s condition by considering their other symptoms rather than the severity of their temperature. ### Sustained or continuous fever A sustained fever is when a person has a temperature above normal that does not fluctuate by more than [1\.5°F (1°C)](https://www.sciencedirect.com/science/article/pii/S1876034111000256#bib0050) for 24 hours. Causes may include: - Gram-negative bacteria: These are bacteria that can cause pneumonia, bloodstream infections, and surgical site infections. - [Typhoid](https://www.medicalnewstoday.com/articles/156859): Typhoid is a bacterial infection that can cause fever. - Acute bacterial meningitis: This is a severe infection that requires emergency medical help. - [Urinary tract infection (UTI)](https://www.medicalnewstoday.com/articles/189953): [Cystitis](https://www.medicalnewstoday.com/articles/152997) is an infection of the bladder, and [urethritis](https://www.medicalnewstoday.com/articles/264903) is an infection of the urethra. ### Intermittent fever An intermittent fever occurs when a person experiences a raised temperature for [several hours](https://www.sciencedirect.com/science/article/pii/S1876034111000256#bib0050) a day. The temperature then goes back to normal before spiking again. Common causes may include: - [Malaria](https://www.medicalnewstoday.com/articles/150670): This is an infection that some mosquitoes transmit. - [Tuberculosis (TB)](https://www.medicalnewstoday.com/articles/8856): This is an infection of the lungs. - [Lymphoma](https://www.medicalnewstoday.com/articles/146136): This is a form of [cancer](https://www.medicalnewstoday.com/articles/323648) that begins in the cells. - [Sepsis](https://www.medicalnewstoday.com/articles/305782): This occurs when the body has an extreme reaction to an infection. ### Remittent fever This is a daily fever that is always higher than normal but may fluctuate as much as [3\.6°F (2°C)](https://www.sciencedirect.com/science/article/pii/S1876034111000256#bib0050) throughout the day. Common causes may include: - Infective [endocarditis](https://www.medicalnewstoday.com/articles/151016): This is an infection of the endocardium, which is the membrane that lines the inside of the heart. - Rickettsiae infections: This is an infection transmitted by ticks, mites, and lice. ## [Potential complications]() People who experience an internal temperature of [104°F (40°C)](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4944502/) and higher for prolonged periods can develop [hyperthermia](https://www.medicalnewstoday.com/articles/320226). For this reason, it is essential to try to keep a fever from becoming too high. Potential complications from a high-grade fever can include: - seizures - unsteadiness - unconsciousness - lethargy - [coma](https://www.medicalnewstoday.com/articles/173655) A high-grade fever can also cause cognitive dysfunction, which affects a person’s memory, comprehension, reasoning, and problem-solving ability. Some people may also have difficulty paying attention. Typically, these symptoms are only [temporary,](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4944502/)and most people recover. However, in extreme circumstances, some people experience permanent changes. ## [Fever and COVID-19]() Fever is a [common symptom](https://www.cdc.gov/coronavirus/2019-ncov/symptoms-testing/symptoms.html) of the novel coronavirus, known as COVID-19. According to a study published in the [New England Journal of Medicine](https://www.nejm.org/doi/full/10.1056/NEJMoa2002032) in February 2020, data on 1,099 people in China who had COVID-19 showed that 43.8% had a fever on admission to the hospital. An estimated 88.7% developed a fever during their hospitalization. The authors defined a fever as an axillary (armpit) temperature of 99.8°F (37.7°C) or higher. Other symptoms include: - a cough - shortness of breath - nausea - vomiting - [diarrhea](https://www.medicalnewstoday.com/articles/158634) If a person suspects they may have COVID-19, they should call a doctor or health department for further testing. *For live updates on the latest developments regarding the novel coronavirus and COVID-19, click [here](https://www.medicalnewstoday.com/articles/live-updates-coronavirus-covid-19).* ## [Treatment]() A low-grade fever can be the body’s protective measure. Scientists are still in debate whether a person should treat a low-grade fever. However, if a person does have a fever or does not feel well, they could take fever-reducing medications, such as: - acetaminophen - ibuprofen - [aspirin](https://www.medicalnewstoday.com/articles/161255) As a fever is typically a symptom of another condition, a person may require different treatments depending on the cause. If a person has an underlying bacterial illness, a doctor may prescribe [antibiotics](https://www.medicalnewstoday.com/articles/10278). These can treat the infection, which can help reduce fever. Other steps a person can take to make themselves more comfortable include resting, drinking plenty of fluids, wearing loose clothing, and taking cool or lukewarm baths. ## [Prevention]() There are some steps a person can take to help prevent getting a fever: - Always cover the mouth and nose when sneezing and wash hands immediately after sneezing or coughing. - Refrain from sharing personal items, such as utensils, cups, and even toothbrushes. - Try not to touch the face. A person can easily transmit the pathogen from their face to their nose or mouth, which might allow the germs to enter the body. - Avoid contact with people who are sick. This can help prevent the transmission of illness. - Maintain good hygiene. Washing hands may help prevent bacteria and viruses from spreading. [Learn more about washing hands properly here.](https://www.medicalnewstoday.com/articles/proper-hand-washing) ## [Summary]() A fever is a protective mechanism for the body as the immune system works to fight against illness in a variety of ways. If a person feels very unwell in addition to having a fever or they are already immunocompromised due to pre-existing conditions, they should seek medical attention. A person should also see their doctor if they have tried to control their fever at home, but over-the-counter medicines and other treatments are ineffective. A fever can become dangerous if it reaches 104°F (40°C) or higher. - [Flu / Cold / SARS](https://www.medicalnewstoday.com/categories/flu-sars) - [Infectious Diseases / Bacteria / Viruses](https://www.medicalnewstoday.com/categories/infectious_diseases) - [COVID-19](https://www.medicalnewstoday.com/categories/covid-19) ### How we reviewed this article: Sources Medical News Today has strict sourcing guidelines and relies on peer-reviewed studies, academic research institutions, and medical journals and associations. We only use quality, credible sources to ensure content accuracy and integrity. You can learn more about how we ensure our content is accurate and current by reading our [editorial policy](https://www.medicalnewstoday.com/articles/process). - Bacterial meningitis. (2019). <https://www.cdc.gov/meningitis/bacterial.html> - Basic TB facts. (2016). <https://www.cdc.gov/tb/topic/basics/default.htm> - Geneva, I. I., et al. (2019). Normal body temperature: A systematic review. <https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6456186/> - Gram-negative bacteria infections in healthcare settings. (2011). <https://www.cdc.gov/hai/organisms/gram-negative-bacteria.html> - Guan, W., et al. (2020). Clinical characteristics of coronavirus disease 2019 in China. <https://www.nejm.org/doi/full/10.1056/NEJMoa2002032> - Mackowiak, P., et al. (1992). A critical appraisal of 98.6 degrees Fahrenheit, the upper limit of the normal body temperature, and other legacies of Carl Reinhold August Wunderlich. <https://jamanetwork.com/journals/jama/article-abstract/400116> - Malaria. (2019). <https://www.cdc.gov/parasites/malaria/index.html> - Ogoina, D. (2011). Fever, fever patterns, and diseases called 'fever' - a review. <https://www.sciencedirect.com/science/article/pii/S1876034111000256#bib0050> - Phipps, M. S., et al. (2011). Epidemiology and outcomes of fever burden among patients with acute ischemic stroke. <https://www.ahajournals.org/doi/pdf/10.1161/STROKEAHA.111.621425> - Steele, G., et al. (2018). Noninfectious causes of fever in adults. <https://journals.lww.com/tnpj/Fulltext/2018/04000/Noninfectious_causes_of_fever_in_adults.6.aspx> - Symptoms of coronavirus. (2020). <https://www.cdc.gov/coronavirus/2019-ncov/symptoms-testing/symptoms.html> - Typhoid fever. (n.d.). <https://wwwnc.cdc.gov/travel/diseases/typhoid> - Urinary tract infections (UTIs). (n.d.). <https://www.plannedparenthood.org/learn/health-and-wellness/urinary-tract-infections-utis> Share this article ![](https://i0.wp.com/post.medicalnewstoday.com/wp-content/uploads/sites/3/2019/12/alana-biggers-1.png?w=105&h=105) [Medically reviewed]() by [Alana Biggers, M.D., MPH]() — Written by [Rachel Nall, MSN, CRNA]() on March 31, 2020 ## Latest news - [Two days of oatmeal may help reduce 'bad' cholesterol levels, study finds](https://www.medicalnewstoday.com/articles/two-days-oatmeal-reduce-ldl-cholesterol-levels-study) - [Is sleep the missing piece in mental health?](https://www.medicalnewstoday.com/articles/is-sleep-the-missing-piece-in-mental-health) - [Is this why dementia affects more women? How menopause alters the brain](https://www.medicalnewstoday.com/articles/dementia-menopause-brain-health-gray-matter-memory-loss) - [Low dose aspirin does not reduce cancer risk in older adults, long-term study finds](https://www.medicalnewstoday.com/articles/low-dose-aspirin-does-not-reduce-cancer-risk-in-older-adults) - [Can treating rheumatoid arthritis before it sets in help delay its onset?](https://www.medicalnewstoday.com/articles/pretreatment-rheumatoid-arthritis-onset-delay-4-years) ### Related Coverage - [What are the best home remedies for fever?](https://www.medicalnewstoday.com/articles/326925?utm_source=ReadNext) Medically reviewed by [Kevin Martinez, M.D.](https://www.medicalnewstoday.com/reviewers) [A fever is an uncomfortable symptom of infection or illness. Learn about the best home remedies for fever in children and adults here.](https://www.medicalnewstoday.com/articles/326925?utm_source=ReadNext) [READ MORE](https://www.medicalnewstoday.com/articles/326925?utm_source=ReadNext) - [How dangerous is a fever in toddlers, and when to seek help](https://www.medicalnewstoday.com/articles/fever-in-toddlers?utm_source=ReadNext) Medically reviewed by [Karen Gill, M.D.](https://www.medicalnewstoday.com/reviewers) [Fever in toddlers normally resolves without treatment. However, some situations warrant medical attention. Learn more about when to seek help here.](https://www.medicalnewstoday.com/articles/fever-in-toddlers?utm_source=ReadNext) [READ MORE](https://www.medicalnewstoday.com/articles/fever-in-toddlers?utm_source=ReadNext) - [What to know about fever in babies](https://www.medicalnewstoday.com/articles/324660?utm_source=ReadNext) Medically reviewed by [Karen Gill, M.D.](https://www.medicalnewstoday.com/reviewers) [Fever in a baby is a sign that their body is fighting off infection. In this article, we look at how to identify fever in a baby, common causes, and…](https://www.medicalnewstoday.com/articles/324660?utm_source=ReadNext) [READ MORE](https://www.medicalnewstoday.com/articles/324660?utm_source=ReadNext) - [Ilaris side effects: What you should know](https://www.medicalnewstoday.com/articles/drugs-ilaris-side-effects?utm_source=ReadNext) [Ilaris, which treats conditions including Still’s disease, can cause side effects such as unexpected weight gain. 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Readable Markdown	Severe illness can cause extremely high temperatures in adults that can be life threatening. A high-grade fever from a rectal measurement is typically 104.1–106.0°F (40–41.1°C). When certain pathogens, such as bacteria and viruses, enter the body, the immune system signals the body to increase its temperature in an attempt to destroy them. This article will discuss how a [fever](https://www.medicalnewstoday.com/articles/168266) affects an adult’s body and when it is cause for concern. If a person is concerned about a fever or how they feel overall, they should talk to a doctor. ![Adult woman in bed with a fever](https://i0.wp.com/post.medicalnewstoday.com/wp-content/uploads/sites/3/2020/03/GettyImages-1194729141edit-1024x575.jpg?w=1155&h=1528) [Share on Pinterest](https://www.pinterest.com/pin/create/button/?url=https%3A%2F%2Fwww.medicalnewstoday.com%2Farticles%2Ffever-in-adults&media=https%3A%2F%2Fpost.medicalnewstoday.com%2Fwp-content%2Fuploads%2Fsites%2F3%2F2020%2F03%2FGettyImages-1194729141edit-1024x575.jpg&description=Fever%20in%20adults%3A%20Symptoms%2C%20treatment%2C%20and%20when%20to%20seek%20help "Share on Pinterest") Doctors consider a temperature above 104°F (40°C) to be a high-grade fever. As a general rule, adults should consider seeking medical attention if their temperature reaches above [104 °F (40°C)](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4944502/). Doctors consider this temperature to be a high-grade fever. However, a fever is not the only symptom a person has when they are ill. A person should consider other symptoms, such as vomiting, breathing issues, confusion, or how they feel overall when deciding whether they need medical attention. Doctors categorize a fever by the reading on the thermometer, how long the fever lasts, and whether it keeps going up and down. Normal body temperature can fluctuate. According to a [2019 systematic](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6456186/)review, typical body temperatures vary according to a person’s age, and whether they take their temperature orally or rectally. The table below indicates a range of normal body temperatures. \| \| \| \| \|---\|---\|---\| \| Ages \| Oral °F (°C) \| Rectal °F (°C) \| \| Mean temperature \| 97\.8 (36.5) \| 98\.6 (37.0) \| \| Less than 60 years of age \| 98\.1 (36.7) \| 98\.8 (37.1) \| \| Over 60 years of age \| 97\.5 (36.4) \| 98\.6 (37.0) \| It is important to note that temperatures can fluctuate. A normal rectal body temperature ranges from [98\.6–100.4°F](https://www.sciencedirect.com/science/article/pii/S1876034111000256#bib0050). - Mild or low-grade fever: 100\.4–102.2°F (38–39°C) - Moderate grade fever: 102.2–104.0°F (39°C–40°C) - High-grade fever: 104\.1–106.0°F (40°C–41.1°C) These temperature values are rectal measurements, which doctors consider the most accurate. However, the article also emphasizes that doctors can better diagnose a person’s condition by considering their other symptoms rather than the severity of their temperature. Sustained or continuous fever A sustained fever is when a person has a temperature above normal that does not fluctuate by more than [1\.5°F (1°C)](https://www.sciencedirect.com/science/article/pii/S1876034111000256#bib0050) for 24 hours. Causes may include: - Gram-negative bacteria: These are bacteria that can cause pneumonia, bloodstream infections, and surgical site infections. - [Typhoid](https://www.medicalnewstoday.com/articles/156859): Typhoid is a bacterial infection that can cause fever. - Acute bacterial meningitis: This is a severe infection that requires emergency medical help. - [Urinary tract infection (UTI)](https://www.medicalnewstoday.com/articles/189953): [Cystitis](https://www.medicalnewstoday.com/articles/152997) is an infection of the bladder, and [urethritis](https://www.medicalnewstoday.com/articles/264903) is an infection of the urethra. Intermittent fever An intermittent fever occurs when a person experiences a raised temperature for [several hours](https://www.sciencedirect.com/science/article/pii/S1876034111000256#bib0050) a day. The temperature then goes back to normal before spiking again. Common causes may include: - [Malaria](https://www.medicalnewstoday.com/articles/150670): This is an infection that some mosquitoes transmit. - [Tuberculosis (TB)](https://www.medicalnewstoday.com/articles/8856): This is an infection of the lungs. - [Lymphoma](https://www.medicalnewstoday.com/articles/146136): This is a form of [cancer](https://www.medicalnewstoday.com/articles/323648) that begins in the cells. - [Sepsis](https://www.medicalnewstoday.com/articles/305782): This occurs when the body has an extreme reaction to an infection. Remittent fever This is a daily fever that is always higher than normal but may fluctuate as much as [3\.6°F (2°C)](https://www.sciencedirect.com/science/article/pii/S1876034111000256#bib0050) throughout the day. Common causes may include: - Infective [endocarditis](https://www.medicalnewstoday.com/articles/151016): This is an infection of the endocardium, which is the membrane that lines the inside of the heart. - Rickettsiae infections: This is an infection transmitted by ticks, mites, and lice. People who experience an internal temperature of [104°F (40°C)](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4944502/) and higher for prolonged periods can develop [hyperthermia](https://www.medicalnewstoday.com/articles/320226). For this reason, it is essential to try to keep a fever from becoming too high. Potential complications from a high-grade fever can include: - seizures - unsteadiness - unconsciousness - lethargy - [coma](https://www.medicalnewstoday.com/articles/173655) A high-grade fever can also cause cognitive dysfunction, which affects a person’s memory, comprehension, reasoning, and problem-solving ability. Some people may also have difficulty paying attention. Typically, these symptoms are only [temporary,](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4944502/)and most people recover. However, in extreme circumstances, some people experience permanent changes. Fever is a [common symptom](https://www.cdc.gov/coronavirus/2019-ncov/symptoms-testing/symptoms.html) of the novel coronavirus, known as COVID-19. According to a study published in the [New England Journal of Medicine](https://www.nejm.org/doi/full/10.1056/NEJMoa2002032) in February 2020, data on 1,099 people in China who had COVID-19 showed that 43.8% had a fever on admission to the hospital. An estimated 88.7% developed a fever during their hospitalization. The authors defined a fever as an axillary (armpit) temperature of 99.8°F (37.7°C) or higher. Other symptoms include: - a cough - shortness of breath - nausea - vomiting - [diarrhea](https://www.medicalnewstoday.com/articles/158634) If a person suspects they may have COVID-19, they should call a doctor or health department for further testing. *For live updates on the latest developments regarding the novel coronavirus and COVID-19, click [here](https://www.medicalnewstoday.com/articles/live-updates-coronavirus-covid-19).* A low-grade fever can be the body’s protective measure. Scientists are still in debate whether a person should treat a low-grade fever. However, if a person does have a fever or does not feel well, they could take fever-reducing medications, such as: - acetaminophen - ibuprofen - [aspirin](https://www.medicalnewstoday.com/articles/161255) As a fever is typically a symptom of another condition, a person may require different treatments depending on the cause. If a person has an underlying bacterial illness, a doctor may prescribe [antibiotics](https://www.medicalnewstoday.com/articles/10278). These can treat the infection, which can help reduce fever. Other steps a person can take to make themselves more comfortable include resting, drinking plenty of fluids, wearing loose clothing, and taking cool or lukewarm baths. There are some steps a person can take to help prevent getting a fever: - Always cover the mouth and nose when sneezing and wash hands immediately after sneezing or coughing. - Refrain from sharing personal items, such as utensils, cups, and even toothbrushes. - Try not to touch the face. A person can easily transmit the pathogen from their face to their nose or mouth, which might allow the germs to enter the body. - Avoid contact with people who are sick. This can help prevent the transmission of illness. - Maintain good hygiene. Washing hands may help prevent bacteria and viruses from spreading. A fever is a protective mechanism for the body as the immune system works to fight against illness in a variety of ways. If a person feels very unwell in addition to having a fever or they are already immunocompromised due to pre-existing conditions, they should seek medical attention. A person should also see their doctor if they have tried to control their fever at home, but over-the-counter medicines and other treatments are ineffective. A fever can become dangerous if it reaches 104°F (40°C) or higher.
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