The 2025 flu season is the worst in over a decade, with record-high infections, hospitalizations, and a rare second peak.

During the height of the COVID pandemic in the 2020-2021 flu season, there was limited to no flu activity. Now, the U.S. is beginning to return to seasonal trends with all three of the viruses ...

Some people will also get gastrointestinal symptoms with the flu, but that is rare, the experts say. Among kids, as many as 25% of those with influenza will experience vomiting or nausea ...