An icon in the shape of a lightning bolt. Impact Link Fever occurs when the body's temperature rises above 100.4° F, usually because of an underlying infection or illness. Thermometers can be used to ...
It’s typical for body temperature to fluctuate throughout the day. You have a fever if your temperature is above 100.4°F (38°C). Depending on how high it is, you may need to call your doctor. A fever ...
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