Influenza is surging in the U.S., with doctor visits for flu symptoms at a 15-year high. Why is this flu season so bad?

Low vaccination rates may also be contributing to this year’s sick season. As of late January, U.S. vaccine uptake was well ...

Influenza levels in the US are the highest they've been in 15 years amid winter weather and a second wave of the virus.

The winter flu season features two types of influenza. Here's what you need to know about them and how they differ.

Do you have a throbbing head and feel pressure around your eyes, cheeks, or forehead? You might have a sinus headache. A sinus headache is caused by inflammation and congestion in the sinuses ...

More than 80 domestic cats have been confirmed to have had bird flu since 2022. Experts say there's a risk that cats could ...

Millions of egg-laying hens have been lost due to the bird flu, causing egg production to slow and prices to skyrocket.

We're in the midst of flu season, and the U.S. is facing a wave that's straining hospitals and closing schools. But not all ...