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  1. www.mayoclinic.org › diseases-conditions › feverFever - Symptoms and causes - Mayo Clinic

    May 7, 2022 · The average temperature has traditionally been defined as 98.6 F (37 C). A temperature taken using a mouth thermometer (oral temperature) that's 100 F (37.8 C) or higher is generally considered to be a fever. Depending on what's causing a fever, other fever signs and symptoms may include: Sweating; Chills and shivering; Headache; Muscle aches

  2. health.clevelandclinic.org › whats-happening-in-myWhat Happens When Your Body Has a Fever

    Mar 5, 2019 · This can cause you to shiver or feel chills (even if you’re sweating or feeling hot at the same time). ... it’s not always a cause for concern. A low-grade fever is between 99 F and 100.9 F ...

  3. www.webmd.com › ss › slideshow-what-to-know-feverFever Causes, Symptoms and Treatments - WebMD

    • When you have an illness or infection, your body temperature may rise above its normal range. This is a fever. It could help your body fight back against its cause.
    • Most of us learned that a normal body temperature is 98.6 F. But new research shows that was the norm for people in the 1800s. Today, studies show that people may be slightly cooler, so the norm is anywhere between 97 and 99 F.
    • If your temperature is higher than normal but it’s lower than 100.4 F, your doctor may say that you have a low-grade fever. A mild illness, like a cold or an ear infection, may cause one.
    • If you have a fever, you may feel hot and sweaty. You also might shiver because you feel chilled. Weakness, aches, or fatigue could happen. You may have symptoms of the illness that caused the fever, like a cough or sore throat.

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

    May 22, 2023 · Causes of fever. An infection, such as the flu, is the most common cause of fever. Other conditions can also cause a fever. These include diseases that produce inflammation, such as rheumatoid arthritis; reactions to drugs or vaccines; and even certain types of cancers. Accompanying symptoms. The following symptoms may also accompany fever ...

    • hhp_info@health.harvard.edu

  5. my.clevelandclinic.org › health › symptomsFever Symptoms & Causes: What Is Considered a Fever?

    May 31, 2023 · What are the most common causes of fever? A fever has many causes and can be a symptom of almost any illness. Common conditions that cause fever include: Bacterial infections. Viral infections such as influenza or COVID-19. Gastrointestinal (GI) infections. Urinary tract infections. Skin infections. You may also develop a fever due to:

  6. www.webmd.com › first-aid › fevers-causes-symptomsFever: Causes, Symptoms, and Treatment - WebMD

    Nov 15, 2023 · A malaria infection, for example, may cause a high fever that gets better and then comes back in cycles. Some areas of the U.S. are hot spots for infections such as Lyme disease and Rocky Mountain ...

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  8. activebeat.com › your-health › fever-in-adults-whenFever in Adults: When to Worry, Symptoms, and Causes - ActiveBeat

    Jun 1, 2021 · Now that we have covered the symptoms of a fever it’s time to talk about what causes a fever. A fever is primarily caused by an infectious source. This could be a bacterial, viral, or inflammatory disease like rheumatoid arthritis or Crohn’s disease. Many times a fever is a good thing, it can be one of the first signs of an illness and we ...