Dilated cardiomyopathy (DCM) is a condition characterized by the enlargement of the heart's chambers, leading to reduced blood pumping ability and potential complications such as blood clots and heart failure. It may arise from various causes, including genetic factors, infections, or exposure to toxins and can present symptoms like fatigue, breathlessness, and palpitations. Diagnosis typically involves family and genetic history assessments, physical exams, and various tests, while treatment options aim to improve heart function and manage symptoms.