Tinnitus has many possible causes, from hearing loss and loud noise to jaw problems and certain medications. Here's what might be behind that ringing sound.
Chronic back pain lasts beyond normal healing and has many causes. Learn what drives it, how psychosocial factors play a role, and what treatment options can help.
Starting Prozac? Here's what typically happens in your body and mood during the first weeks, including when to expect relief and side effects to know about.
ALT is a liver enzyme measured in routine blood tests. Learn what normal levels look like, why yours might be high, and when to follow up with your doctor.