Add Yahoo as a preferred source to see more of our stories on Google. You know the feeling. When you first see your crush and your head starts spinning, your palms ...

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.

The heart is the body's hardest-working muscle. Whether you're awake or asleep, or exercising or resting, your heart is always at work. It pumps blood through arteries to deliver oxygen to organs and ...

Many people find themselves lying in bed, suddenly aware of their heart beating faster than usual. When the room grows still, the pulse in your chest can feel louder, stronger and impossible to ignore ...

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