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Cold, Flu, & Cough Health Center

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Influenza (Seasonal Flu) - What Happens

Influenza (flu) usually comes on suddenly. In many cases people can pinpoint the hour when symptoms started. Symptoms develop 1 to 4 days after you are infected, and they include:

  • Fever, which lasts for about 3 days. Fever is usually slightly lower on the 2nd and 3rd days but may last up to 8 days.
  • Cough, runny nose, and sore throat, which become more noticeable as fever and other symptoms decrease. These symptoms usually last 3 to 4 days after the fever goes down. A dry, hacking cough may linger for up to 10 days after other symptoms are gone.

Complete recovery may take 1 to 2 weeks or longer. Fatigue and weakness can last for several weeks.

Recommended Related to Cold & Flu

The Truth Behind Mom's Cold and Flu Advice

Mothers are celebrated (if sometimes vilified) for their eagerness to advise their children on matters big and small: how to behave, what to wear, whom to marry, when to have kids ... and, oh yes, how to stay healthy during cold and flu season. Does science back up what Dr. Mom told you about the common cold? Or was she full of hot air? Here's what real doctors have to say about 10 familiar cold-busting tips:

Read the The Truth Behind Mom's Cold and Flu Advice article > >

Complications of influenza may develop in anyone, but they are much more likely in older adults and people who have other health problems, especially heart and lung diseases.

    WebMD Medical Reference from Healthwise

    Last Updated: September 09, 2014
    This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
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