The heart rhythm disorder called atrial fibrillation (AFib) can affect people of any age, but is most common in older adults. It may start with a rapid heartbeat, a fluttering feeling in a person’s ...

Sometimes there are no symptoms of AFib. That's unfortunate, because over the long term, arrhythmia is hard on the heart it can weaken the heart muscle or lead to the development of heart failure, Dr.

That little number on your fitness tracker might be more important than you realize. Your resting heart rate isn’t just some random vital sign. It’s essentially a window into how efficiently your ...