DAVID MARKS, MD: I'm Dr. David Marks. Many alcoholics don't even know they have a problem. So what are the symptoms of alcoholism? And when...

ANNOUNCER: Hepatitis B is a viral infection of the liver that affects over a million Americans. Found in blood and certain body fluids, the...

ANNOUNCER: Hepatitis C is often referred to as a "silent epidemic". It is largely overlooked by the general public, although many physicians and...