What happens in your body during a fever?

In response to infection, the hypothalamus in the brain can induce a temporary spike in body temperature — a fever — in a variety of ways.  (Image credit: Highwaystarz-Photography via Getty Images)

You wake up in the middle of the night, shivering. You’re experiencing a fever — a temporary spike in body temperature. 

Fevers can arise as the body’s defense system fights off an infection, but they can also be triggered by other things, including autoimmune diseases such as rheumatoid arthritis, or occur as a side effect of certain drugs.


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