A fever is a higher-than-normal body temperature, one of the body’s natural responses to infection. A low-grade fever isn’t usually a cause for concern, but a temperature 102°F and above should be treated.

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. For kids, a fever is when their temperature is higher than 100.4°F (measured rectally); 99.5°F (measured orally); or 99°F (measured under the arm).

 

 

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