How long does flu vs covid last?
Last updated September 6, 2026.
**Flu usually runs its course in about 3 to 7 days, while mild COVID-19 more often takes 1 to 2 weeks, and both can leave a cough and low energy behind for another week or two.** Flu tends to hit suddenly with fever, body aches, and headache, and the fever usually breaks within 3 to 4 days. COVID-19 symptoms often build more gradually and vary widely from person to person, so the timeline is less predictable. Age, vaccination status, pregnancy, and conditions like asthma, diabetes, or a weakened immune system all stretch recovery. Testing matters because antivirals for both illnesses work best when started within the first days of symptoms. Rest, fluids, and staying home while you have a fever help you recover and protect the people around you.
What to do
- Test early: A test in the first day or two tells you which illness you have, and symptoms alone cannot reliably separate them.
- Ask about antivirals: Treatment for flu or COVID-19 works best when started within the first few days, so contact a clinician quickly if you are at higher risk.
- Track your fever: Note when the fever starts and stops, since staying fever-free for 24 hours without medicine is the practical marker for returning to normal activity.
- Expect a tail: A dry cough and tiredness for one to two weeks after the main illness is common and does not mean the infection is still active.
- Watch for a second dip: Feeling better and then worse again, with new fever or ear or sinus pain, can signal a secondary infection worth a visit.
- Get vaccinated each fall: Current flu and COVID-19 vaccines shorten illness and lower the chance of severe disease.
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