There are a lot of assumptions we make about our hearts. And for each myth, there is often some truth upon which it is founded.
Take heart attacks, for instance.
Most people imagine they would know when they are having a heart attack. It would be difficult not to recognize symptoms of "the big one" – sweating, soreness in the left arm, and sudden, disabling chest pain.
But that’s not always the case. Sometimes the signs are much more subtle or mimic other conditions.
"I have heard of instances...