Flu

Take the Cold & Flu Quiz

Medical Definition of Flu

Flu: Flu is a colloquialism for influenza. The flu is an acute respiratory illness caused by influenza viruses A or B . Most people who get the flu recover completely in 1 to 2 weeks, but some people develop serious and potentially life-threatening medical complications, such as pneumonia. Much of the illness and death caused by influenza can be prevented by annual influenza vaccination.


Cold & Flu Quiz: Test Your Medical IQ

Subscribe to MedicineNet's General Health Newsletter

By clicking Submit, I agree to the MedicineNet's Terms & Conditions & Privacy Policy and understand that I may opt out of MedicineNet's subscriptions at any time.

Reviewed on 5/13/2016

Health Solutions From Our Sponsors