Fever - Symptoms & causes - Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/fever/symptoms-causes/syc-20352759
WEBMay 7, 2022 · A fever is a temporary rise in body temperature. It's one part of an overall response from the body's immune system. A fever is usually caused by an infection. For most children and adults, a fever may be uncomfortable. But it usually isn't a cause for concern. For infants, however, even a low fever may mean there's a serious infection.
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