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      • Most fever is beneficial, causes no problems, and helps the body fight off infections. The main reason to treat a fever is to increase comfort. Fever is the result of an immune response by your body to a foreign invader. Foreign invaders include viruses, bacteria, fungi, drugs, or other toxins.
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    Is it possible to have a fever without a fever?

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  2. Fever - Symptoms and causes - Mayo Clinic

    A fever is a temporary increase in your body temperature, often due to an illness. Having a fever is a sign that something out of the ordinary is going on in your body. For an adult, a fever may be uncomfortable, but usually isn't a cause for concern unless it reaches 103 F (39.4 C) or higher.

  3. What causes a fever? - Scientific American

    Nov 21, 2005 · Fever can support the immune system's attempt to gain advantage over infectious agents, such as viruses and bacteria, and it makes the body less favorable as a host for replicating viruses and ...

  4. Fever: Symptoms, treatments, types, and causes

    May 05, 2020 · When someone has a fever, they may also: shiver and feel cold when nobody else does; sweat; have a low appetite; show signs of dehydration; have increased sensitivity to pain; lack energy and feel ...

  5. 13 Unexpected Reasons Why You Might Have A Fever | HuffPost Life

    Apr 16, 2020 · In other cases, the cancer cells themselves secrete cytokines ― or substances in the body ― that can cause a fever. And, according to Pardee, cancers like leukemia can impair your body’s ability to fight off infections resulting in prolonged illnesses and fevers.

  6. Fever Facts: High Temperature Causes and Treatments

    Continued. In response to an infection, illness, or some other cause, the hypothalamus may reset the body to a higher temperature. Although the most common causes of fever are common infections ...

  7. How to Tell If You Have a Fever: Symptoms, Next Steps, and More

    Apr 21, 2020 · A fever is the body’s way of battling an illness. Although it’s possible to have one without a known cause, fevers are usually brought on by a virus or bacterial infection.

  8. Fever in Adults - What You Need to Know -

    Feb 03, 2020 · A fever is an increase in your body temperature. Normal body temperature is 98.6°F (37°C). Fever is generally defined as greater than 100.4°F (38°C). What are common causes of a fever? The cause of your fever may not be known. This is called fever of unknown origin. It occurs when you have a fever above 100.9˚F (38.3°C) for 3 weeks or more.

  9. Persistent low grade fever: Causes and treatments

    A fever is commonly a result of the body trying to fight off an infection or another illness. However, some cases are more difficult to diagnose and treat. Continue reading to learn more about the...

  10. Is it normal to have a fever that only lasts a few hours? - Quora

    Your fever can elevate for any reason. If it lasts for 24 hrs. or longer, then you need worry. Because all a fever does is fight off any foreign bacteria or virus. Because as everyone knows we have both good and sometimes bad bacteria, in all our stomachs.

  11. Low-Grade Fever - Symptoms, Causes, Treatments

    In an adult, a fever is generally defined as 100 degrees Fahrenheit (37.8 degrees Celsius) or greater Fevers often accompany infections and are part of your body’s natural defense against them. Body temperature can also be elevated by physical activity and environmental factors, such as wearing heavy clothing or a high ambient temperature.