Symptoms of influenza (the flu) include:
- Sudden onset of high fever lasting 3-5 days.
- Headache and muscle pain that is often severe.
- Cough with or without sore throat, runny or stuffy nose.
- Extreme tiredness lasting 2-3 weeks or more.
Most people recover in about a week. However, the flu may be associated with serious complications such as pneumonia, kidney failure, swelling of the brain and death.
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