The clinical manifestations of dilated cardiomyopathy can be summarized in two words: "three hearts," which are reflected in the following three aspects.

First, heart enlargement, such as through chest X-rays or echocardiography, often reveals a notable enlargement of the patient's heart.

Second, arrhythmias; dilated cardiomyopathy often accompanies a variety of arrhythmias, such as frequent ventricular premature beats, tachycardia, or atrial fibrillation.

Third, heart failure. Dilated cardiomyopathy often results in symptoms of heart failure, such as exertional dyspnea and paroxysmal nocturnal dyspnea.