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How long do flu symptoms last?

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Most flu symptoms gradually improve over two to five days, but it's not uncommon to feel run down for a week or more. A common complication of the flu is pneumonia, particularly in the young, elderly, or people with lung or heart problems. If you notice shortness of breath, let your doctor know. Another common sign of pneumonia is fever that comes back after having been gone for a day or two.

SOURCES: 

FDA: "Colds and Flu: Time Only Sure Cure." 

American Lung Association: "A Survival Guide for Preventing and Treating Influenza and the Common Cold." 

CDC: "Questions and Answers: Cold versus Flu." "Questions and Answers: Swine Flu and You," "Key Facts about Swine Influenza (Swine Flu)."

National Jewish Medical and Research Center: "Is It a Cold or the Flu?" 

UpToDate: "Clinical Manifestations and Diagnosis of Influenza in Adults," " The Common Cold in Adults: Diagnosis and Clinical Features." 

Reviewed by Carol DerSarkissian on November 11, 2020

SOURCES: 

FDA: "Colds and Flu: Time Only Sure Cure." 

American Lung Association: "A Survival Guide for Preventing and Treating Influenza and the Common Cold." 

CDC: "Questions and Answers: Cold versus Flu." "Questions and Answers: Swine Flu and You," "Key Facts about Swine Influenza (Swine Flu)."

National Jewish Medical and Research Center: "Is It a Cold or the Flu?" 

UpToDate: "Clinical Manifestations and Diagnosis of Influenza in Adults," " The Common Cold in Adults: Diagnosis and Clinical Features." 

Reviewed by Carol DerSarkissian on November 11, 2020

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