This flu season is shaping up to be one of the worst on record. The Centers for Disease Control and Prevention is calling it an "epidemic."

How can you tell if what you have is the flu? Watch the video above to better understand the differences between common cold and influenza. And, if you haven't gotten a flu shot yet, doctors say it's not too late.

Video • Christa Lemczak
Reporting • James Mulder
Music • "Neck Pillow" • Silent Partner