Harvard Health Tips

Bad cold vs. flu

When you first start feeling sick, it can be difficult to tell whether you have a bad cold or the flu. A hallmark of the flu is the rapid onset of symptoms. People often say that the flu hit them ?like a ton of bricks.? In fact, people with the flu can sometimes pinpoint exactly when they started feeling ill. The flu can last for 24 hours to a week or even longer, but…

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