In some cases, these irregular beats may point to arrhythmia, a condition in which the heart beats too fast, too slow or irregularly because of a disruption in its electrical signals. To understand ...

You know your heart is constantly beating, but when it suddenly starts racing, you may worry.. If you're knee-deep in an ...

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 ...

DEAR MAYO CLINIC: When I go for a walk or to the gym, people always seem to be checking their pulse, whether by hand or with a wearable. Why is heart rate so important? ANSWER: Your heart rate, or ...