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1. www.healthline.com › health › cold-fluFever in Adults: Characteristics, Types, and When It's Serious

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   Sep 17, 2019 · Common causes of a fever in adults are: viral infection (like the flu or a cold) bacterial infection. fungal infection. food poisoning. heat exhaustion. serious sunburn. inflammation (from ...

2. www.health.harvard.edu › treating-fever-in-adultsFever in adults: when to worry - Harvard Health

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   May 22, 2023 · The average body temperature is 98.6° F (37°C). But "normal" body temperature varies from person to person. It also changes during the day, rising a bit after you eat or exercise. Body temperature is often higher in the afternoon than it is when you wake up in the morning. Fever means a body temperature of 100.4° F (38°C) or higher.

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3. www.aafp.org › pubs › afpProlonged Febrile Illness and Fever of Unknown Origin in Adults

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   Jul 15, 2014 · Continue Reading. Fever of unknown origin has been described as a febrile illness (temperature of 101°F [38.3°C] or higher) for three weeks or longer without an etiology despite a one-week ...

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4. www.mayoclinic.org › diseases-conditions › feverFever - Symptoms & causes - Mayo Clinic

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   May 7, 2022 · A fever is a temporary rise in body temperature. It's one part of an overall response from the body's immune system. A fever is usually caused by an infection. For most children and adults, a fever may be uncomfortable. But it usually isn't a cause for concern. For infants, however, even a low fever may mean there's a serious infection.

5. www.verywellhealth.com › when-is-a-fever-too-highWhat Causes a High-Grade Fever and When Is It Too High?

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   Mar 7, 2024 · A high fever can also occur if certain infections are left untreated and either get worse or start to affect other organs. Infectious causes of high fever include: Appendicitis (inflammation of the appendix) Cellulitis (a skin infection in deeper skin layers) Encephalitis (inflammation of the brain)

6. www.healthline.com › health › persistent-low-grade-feverPersistent Low-Grade Fever in Kids and Adults: Causes and Treatme

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   Nov 14, 2023 · Persistent (chronic) fevers are typically defined as fevers lasting more than 10 to 14 days. ... For an adult, a fever isn’t usually a cause for concern unless it goes above 103°F (39.4°C). ...

7. People also ask

   What causes a high fever a day?

   • Sepsis: This occurs when the body has an extreme reaction to an infection. 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.

   Fever in adults: Symptoms, treatment, and when to seek help

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   What causes a high-grade fever?

   • Almost any infection can cause a high-grade fever, particularly if the body has not been exposed to the pathogen before and has no immunity to it. A high fever can also occur if certain infections are left untreated and either get worse or start to affect other organs. Some non-infectious conditions associated with high-grade fever include:

   What Causes a High-Grade Fever and When Is It Too High? - Verywell H…

   www.verywellhealth.com/when-is-a-fever-too-high-770347

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   What causes 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.

   Fever in adults: Symptoms, treatment, and when to seek help

   www.medicalnewstoday.com/articles/fever-in-adults

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   What causes a low fever?

   • A fever is usually caused by an infection. For most children and adults, a fever may be uncomfortable. But it usually isn't a cause for concern. For infants, however, even a low fever may mean there's a serious infection. Fevers generally go away within a few days. A number of over-the-counter medications lower a fever.

   Fever - Symptoms & causes - Mayo Clinic

   www.mayoclinic.org/diseases-conditions/fever/symptoms-causes/syc-20352759

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8. www.medicalnewstoday.com › articles › fever-in-adultsFever in adults: Symptoms, treatment, and when to seek help

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   Mar 31, 2020 · 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).