Some people with dilated cardiomyopathy don't have any signs or symptoms in the early stages of the disease. Signs and symptoms of dilated cardiomyopathy may include: 
Fatigue
Shortness of breath (dyspnea) during activity or while lying down
Reduced ability to exercise
Swelling (edema) in the legs, ankles, feet or belly (abdomen)
Chest pain or discomfort 
Fast, fluttering or pounding heartbeat (palpitations)
