Flu Season


When Is Flu Season?

Flu season

Flu season is the time of year when the flu virus is most common. Flu season usually begins when cold weather appears. Why? There’s no apparent reason. It’s simply a characteristic of the flu and the timing of the seasons.

Outbreaks of the flu occur in different seasonal patterns around the world. In temperate climate zones, flu season will typically begin in the late fall and peak in mid-to-late winter. In tropical zones, flu seasons appear to be less pronounced, with year-round isolation of the virus.

Flu Season in the U.S.

Annual outbreaks of seasonal flu usually occur during the fall through early spring. In a typical year, approximately 5%-20% of the population gets the seasonal flu, which is a serious disease that can cause illness, hospitalization, and death. In fact, between 3,000 and 49,000 people die from flu-related causes annually.

The overall health impact of the flu changes from year to year. This is due to unpredictability as well as vaccine variations and activity. But, by identifying flu symptoms early on, and knowing about flu treatment and prevention options, such as seasonal flu vaccines and prescription flu medicines, you can be better prepared to face the flu season.


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