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 ...

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

The simple, constant rhythm of a beating heart is a reassuring sign of life. With each lub-dub, blood brings life-sustaining oxygen throughout the body. But behind this steady beat is a busy ...

For the first time, surgeons have successfully performed a remarkable new heart transplant in which the donor organ never skips a beat in the process, reducing the damage that can occur during such a ...