What happens in your body during a fever?

In response to infection, the hypothalamus in the brain can cause a temporary increase 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, shaking. You experience a a fever — a temporary spike in body temperature.

Fevers can occur as the body’s immune system fights infection, but they can also be triggered by other things, including autoimmune diseases like rheumatoid arthritisor occur as a side effect of some medicines.

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