Myocarditis is an inflammatory lesion of the myocardium that can be classified as acute, subacute, or chronic, and in general is divided into two categories: infectious and noninfectious. In recent years, the incidence of viral myocarditis has increased significantly, so we focus on viral myocarditis. Clinical manifestations: The clinical manifestations of viral myocarditis often depend on the extensiveness of the myocardial lesions and vary greatly in severity. About half of the patients have prodromal symptoms of viral infection 1 to 3 weeks before the onset of the disease, such as fever, generalized lethargy, or gastrointestinal symptoms such as nausea, vomiting, and diarrhea, followed by palpitations, chest pain, dyspnea, swelling, and even As syndrome. Physical examination reveals tachycardia not parallel to the degree of fever, various arrhythmias, and a third heart sound may be heard, or signs of heart failure such as jugular venous anger, pulmonary rales, and hepatomegaly. ST-T changes and various arrhythmias, especially ventricular arrhythmias and atrioventricular block, are common on ECG. Echocardiography may show normal, hypo-diastolic left ventricular function, segmental or diffuse ventricular wall motion, left ventricular enlargement or appendicular thrombus. Serum troponin and myocardial creatine kinase are increased, and blood sedimentation is accelerated. Diagnosis can be made with reference to the reference criteria for diagnosis of acute myocarditis in adults proposed by the National Symposium on Myocarditis Cardiomyopathy in 1999, in terms of four aspects: history and signs, electrocardiographic manifestations, reference indicators of myocardial damage, and pathogenic basis. Treatment: Patients with viral myocarditis should rest in bed during the acute phase, and eat foods rich in vitamins and proteins. The patient with frequent premature beats or arrhythmias should be treated with anti-arrhythmic drugs, such as betalactone, amiodarone, propafenone, lidocaine, etc. In heart failure, diuretics, vasodilators, angiotensin converting enzyme inhibitors, etc. should be used. In the chronic phase, cardiac muscle-nourishing drugs such as sodium fructose diphosphate and coenzyme Q10 can be taken. In the acute stage, TCM treatment is based on expelling the evil energy and nourishing the heart and tranquilizing the mind. For those who have more premature beats, Chinese medicine such as heart stabilizing granules, ginseng heart capsule and astragalus granules can be used. Most of the patients can be cured after proper treatment, but there are arrhythmias where the premature beats often last for a long time and tend to increase after colds and exertion, which should be avoided.