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  1. Fever: MedlinePlus Medical Encyclopedia

    Fever is the temporary increase in the body's temperature in response to a disease or illness. A child has a fever when the temperature is at or above one of these levels: 100.4°F (38°C) measured in the bottom (rectally) 99.5°F (37.5°C) measured in the mouth (orally)

  2. Fever in adults - Harvard Health

    Fever means a body temperature of 100.4° F (38°C) or higher. 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.

  3. Fever

    What is a fever? A fever is a higher-than-normal body temperature. It’s a sign of your body's natural fight against infection. For adults, a fever is when your temperature is higher than 100.4°F.

  4. Fever | Johns Hopkins Medicine

    A fever is a body temperature that is higher than normal. It usually means there is an abnormal process occurring in the body. Exercise, hot weather, and common childhood immunizations can also make body temperature rise. What causes a fever?

  5. Fever - American Cancer Society

    A fever is a body temperature that is higher than normal. But, a normal temperature in one person might be different from a normal temperature in another person. This is why it's important to find out what your cancer care team thinks might be a fever for you. They will tell you what temperature you should consider higher than normal.

  6. Fever -

    A fever is usually caused by infections from viruses (such as a cold or the flu) or bacteria (such as strep throat or some ear infections). The fever itself is not the disease, only a sign that the body’s defenses are trying to fight an infection.

  7. 8 Home Remedies for Fever - How to Get Rid of a Fever

    Oct 07, 2019 · Even though fevers are a literal pain to deal with, think of them as your body’s early warning system. Most fevers are caused by infections, so your body jacks up the temperature by moving blood...

  8. Fever: suppress or let it ride? - PubMed Central (PMC)

    Dec 05, 2015 · Fever is estimated to be more than 4 million years old and has been documented in the phyla Vertebrata, Arthropoda, and Annelida . Despite its long history of study, the exact mechanism of fever and its potentially protective effect is not fully delineated.

  9. Fevers are defined as any body temperature above 98.6° F (37° C). Some people may talk about a low-grade fever versus a regular fever or a high-grade fever. These terms are not universally defined, but it is important to monitor the degree of your fever in the context of your cold or flu and take appropriate action to treat.

  10. Scarlet fever - Wikipedia

    Scarlet fever is a disease which can occur as a result of a group A streptococcus (group A strep) infection, also known as Streptococcus pyogenes. The signs and symptoms include a sore throat, fever, headaches, swollen lymph nodes, and a characteristic rash.