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A fever is an increase in the body's temperature. It is usually defined as a temperature of 100.4°F (38°C) or higher. Brief mild or moderate fevers generally have no long-term effects, and they often do not need treatment. Moderate or high fevers may make you feel uncomfortable and can sometimes be a sign of a serious illness or disease. The sweating that may occur with repeated or prolonged fever may also cause a loss of fluid in the body (dehydration).
This information is not intended to replace advice given to you by your health care provider. Make sure you discuss any questions you have with your health care provider.
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