Does your doctor listen to your heart every time you visit? Even the faintest murmurs heard through a stethoscope can be a sign of heart valve disease. A condition affecting more than 11 million Americans, heart valve disease happens when one or more of the heart’s four valves are damaged. Other common symptoms can include lightheadedness, chest pain, tiredness, edema or feeling “off” in general — but these symptoms are too often shrugged off.