Symptoms of the flu can hit very quickly and may last several weeks.
Days 1–3: Sudden appearance of fever, headache, muscle pain and weakness, dry cough, sore throat, and sometimes a stuffy nose.
Day 4: Fever and muscle aches decrease. Hoarse, dry, or sore throat, cough, and possible mild chest discomfort become more noticeable. You may feel tired or flat.
Day 8: Symptoms decrease. Cough and tiredness may last one to two weeks or more.
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Symptoms of the flu can hit very quickly and may last several weeks.
Source: https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/flu-influenza