Mitral valve regurgitation is often mild and develops slowly. Some people do not have symptoms for many years. But sometimes, mitral valve regurgitation develops quickly.

Fatigue is a common … to understand the causes of mitral valve disease, it may be helpful to know how the heart works. The mitral valve is one of four valves in the heart that keep blood flowing in the right direction. Each valve has flaps, also called leaflets, that open and close o…