Heart disease
Congestive Heart Failure (CHF) – This is a condition that means that the heart is not pumping at normal levels. Two common causes are a weak or sick heart muscle and abnormal heart valves. The valves may not let enough blood through because they are too narrowed. Or the valve may "leak" and let blood flow backwards (the wrong direction) inside the heart. When the heart valves do not work normally, the heart muscle has to do extra work and it can become tired.