A fever is when your body temperature is 100.4°F (38°C) or greater. See a doctor if temperatures are at least 100.4°F (38°C) for infants, 102.2°F (39°C) for children, and 103°F (39.4 C) for adults.
You may be able to break a fever at home with rest, hydration, and over-the-counter medications. But a person with a high fever may need medical attention. People may refer to a fever as hyperthermia, ...
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