"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Atrial fibrillation, also known as AFib, is an irregular heartbeat, or arrhythmia that happens when the ...

Atrial fibrillation impact millions of people. but it is easy to miss. Dr. Wilber Su with Banner Health shares some symptoms people should watch out for.

Atrial fibrillation, also known as AFib, is an irregular heartbeat, or arrhythmia that happens when the upper chambers of the heart (the atria) are out of sync with the lower chambers and beating ...