A cold begins when a virus attaches to the lining of your nose or throat.

Cold viruses have a lot in common, but each type has its own style, too.

It's a question that puzzles lots of folks when symptoms hit: Is all that coughing and sneezing from a cold or hay fever?

Do you feel under the weather and wonder if you're sick with the flu or a cold?

A doctor can usually tell if you have the flu based on your symptoms, especially if it’s during peak season.

Bird flu, or avian influenza, is a viral infection spread from bird to bird. The most common kind is the H5N1 strain.

While swine flu isn't as scary as it seemed a few years ago, it's still important to protect yourself from getting it.