The U.S. winter virus season is in full force, and by one measure is the most intense in 15 years.

Data from the Centers for Disease Control and Prevention shows seasonal flu activity continues to increase across the country ...

There's also one big difference between the flu and COVID or a cold that can indicate which illness you have. Don't ignore it ...

The flu can also cause a general feeling of fatigue or malaise, Ray says, as well as gastrointestinal issues like diarrhea ...

Feeling under the weather? In Texas, cedar can bring sneezing, congestion and itchy eyes, but so can the flu, COVID-19 and other illnesses.