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 ...

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

Tucked in the basement of the Mayo Building on the University of Minnesota’s Twin Cities campus sits a detached, beating pig’s heart floating in clear liquid. Graduate and undergraduate students ...

In atrial fibrillation, the heartbeat is very irregular and often fast. Doctors use medicines to control both the speed and ...

Though an estimated 60 million people around the world have atrial fibrillation, or A-fib, a type of irregular and often fast ...