Mitral Valve Prolapse

This is a problem with the heart's mitral valve. That's the valve between the chambers on the left side of the heart. The mitral valve opens when the heart expands, and closes when the heart contracts. But with this condition, one or both of the valve's flaps are floppy or stretchy. They don't close the way they should. Instead, they bulge into the upper chamber. Blood may leak through the valve.