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 ...

Add Yahoo as a preferred source to see more of our stories on Google. You're curled up on the couch, finally relaxing after a long day when suddenly, your heart starts racing. You're obviously not ...

Heart palpitations are common sensations such as fluttering, racing, or skipped beats. Though usually harmless, they can signal conditions like AFib when persistent or accompanied by new symptoms.

Celine Dion sings that "my heart will go on," but how many times does it actually beat in a day or even a lifetime? When you purchase through links on our site, we may earn an affiliate commission.

Adrenaline surges, elevated heart rate, and rising troponin: Here's what happens to your heart during a marathon.