A week of diarrhea can have several causes, from lingering infections to medications and diet. Here's what might be behind it and when to see a doctor.
Coffee typically has more caffeine than black tea, but the gap is smaller than you'd think—and tea leaves actually start out more caffeinated than coffee beans.
The heart isn't part of the nervous system, but the two are deeply connected. Learn how the heart generates its own rhythm and talks back to the brain.
Learn how to recognize low blood sugar symptoms and treat them quickly, including what to eat, when to ask for help, and what to do at night or before driving.
Mixing alcohol with Flagyl can cause an unpleasant reaction. Here's what happens in your body, how long to wait, and what to do if you already had a drink.