Early manifestations of dilated cardiomyopathy usually include congestive heart failure, embolism, chest pain, arrhythmia, and sudden death. 1. Congestive heart failure: dilated cardiomyopathy is a condition in which one or both heart chambers are enlarged and the myocardial contraction pump is dysfunctional, leading to symptoms of congestive heart failure. 2. Embolism: It can lead to heart, brain, kidney and lung embolism in patients, and the thrombus mainly comes from enlarged ventricles or atria. Especially in atrial fibrillation, the symptoms of embolism are most obvious. 3. Chest pain: As the coronary microcirculatory system of patients with dilated cardiomyopathy is vasodilated and the reserve capacity is reduced, therefore, subendocardial myocardial ischemia will trigger chest pain. 4. Arrhythmia: Arrhythmia is caused by degeneration, fibrosis and necrosis of cardiomyocytes after the enlargement of cardiac chambers, which leads to problems in cardiac pacing and conduction. 5. Sudden death: It is due to the failure of heart function, such as heart failure, which leads to the weakening of the systolic and diastolic functions of the heart, and once weakened, sudden death will occur. It is recommended to consult a doctor in time for relevant examinations, according to the specific circumstances, under the guidance of the doctor, for symptomatic treatment.