Dilated cardiomyopathy (DCM) is a medical condition characterized by the weakening and enlargement of the heart muscle, leading to decreased heart function. This condition can result in symptoms such as fatigue, shortness of breath, and swelling in the lower extremities. DCM can be caused by various factors including genetics, infections, and certain medications. Treatment often involves medications to manage symptoms, lifestyle modifications, and in severe cases, heart transplant may be necessary.