Atrial fibrillation, also known as AFib, happens when your normal heartbeat or rhythm is thrown off. Yes, it can be dangerous. Your heart may not be able to pump enough blood.
On the other hand, millions of people with long-lasting AFib live quite well, says Gordon F. Tomaselli, MD, chief of the division of cardiology at Johns Hopkins University School of Medicine. "It's very possible to live a normal life for many years."
So let's clear up those ideas that may be limiting you when they don't...
The quivering upsets the normal rhythm between the atria and the lower parts of the heart, the ventricles. And the ventricles may beat fast and without a regular rhythm.
This is dangerous because if the heartbeat isn't strong and steady, blood can collect, or pool, in the atria. And pooled blood is more likely to form clots. Clots can travel to the brain, block blood flow, and cause a stroke.