You know the feeling. When you first see your crush and your head starts spinning, your palms get sweaty, and your heart begins beating a mile a minute. Is this love? Or is it … an arrhythmia? The ...

Your heart beats about 100,000 times a day. Sometimes it beats faster and sometimes more slowly, depending on what you're doing and whether, for instance, you're all worked up about something. So ...

A fast heartbeat can be caused by emotions like stress or anxiety. Dehydration, or drinking caffeine or other stimulants, can ...