How long does the flu last?
Last updated September 3, 2026.
Fever breaks in 3 to 4 days, most symptoms clear in 7 to 14, and the cough and exhaustion can linger for weeks - that tail is normal. Contagiousness runs on its own clock: per the CDC, you spread flu from about a day before symptoms to 5 to 7 days after, most contagious in the first three. Stay home through the fever days, and treat breathing trouble, confusion, or an improve-then-crash pattern as medical-now signs.
What to do
- Budget a week down. Rest, fluids, and fever control are the treatment for most healthy adults.
- Isolate through the contagious window. A day before symptoms to about a week after - the first 3 days most of all.
- Ask about antivirals early. They work best within 2 days of symptoms, especially for higher-risk people.
- Escalate the red flags. Breathing trouble, chest pain, confusion, or improve-then-crash: medical care now.
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