Influenza—or the flu—is a common viral respiratory infection that can be extremely dangerous for some people. Learn more about how to prevent and treat the flu as well as some potential complications related to the illness.

Explore Flu

A man blows his nose
Why Nasal Congestion Happens—And How to Treat It
man in wheelchair getting flu shot
This Year's Flu Shot Is a 'Good Match,' CDC Says—But Cases and Hospitalizations Continue to Rise
senior man receiving flu shot
CDC Recommends Stronger Flu Shots for People 65 and Older This Season—Here's Why