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Constant Fever in Children

Constant fever in children is frightening for both the child and her parents. In most cases, a fever signifies an underlying, temporary infection caused by a virus or bacteria. Once the infection clears up, the fever disappears. In a few rare cases, a fever will return again and again, with no apparent cause. This is called “chronic” or “periodic” fever syndrome. Such fevers are also called “fevers of undetermined origin,” or FUO for short.