The first heart sound, or S1, is the "lub" of a normal heartbeat. It's a high-pitched sound that occurs at the beginning of ...

A third heart sound, or S3, is a low-frequency, extra heart sound that may be heard with a stethoscope right after the normal ...

Heart murmurs can sometimes be harmless, or they might need to be addressed if they're caused by a heart condition. Here's ...

Chest pain can be a scary symptom. It's not always serious, but it can be a sign you're having a heart attack. The issue, medical experts say, is that some patients experiencing chest pain don't want ...