It's not easy to tell these health conditions apart based on their symptoms alone. Find out about the differences between these illnesses.

Dear A.T.R.: Both colds and influenza (the "flu") are respiratory illnesses that are caused by viruses. Influenza is caused specifically by the influenza viruses, which come in two main types (A and B ...

Dear Doctors: My wife started getting sick a few days before Halloween. We were worried that it was going to turn into a bad respiratory illness, but it stayed in her nose and throat. That's a common ...