How Is Fever and Flu Related?

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These messages are for mutual support and information sharing only. Always consult your doctor before trying anything you read here.
Fever is a higher than normal body temperature. It is the most common symptom of the flu. Although fever may cause worry, it helps the body fight infection and is usually not harmful. A person with the flu may experience a fever that:
  • Increases quickly, rising to a peak of 101–104 F within 12–24 hours.
  • Comes and goes, especially if medicines are used to treat it.
  • Typically lasts 3–5 days.
Remember: you should contact a doctor if the high body temperature lasts for more than 3 days or gets worse. Keyword: fever flu; flu fever