Adult patients with myocarditis may be asymptomatic in mild cases, while in severe cases, they may have fever, generalized lethargy, palpitations, chest pain or even fainting and sudden death. Symptoms of adult myocarditis patients depend on the scope of the lesion and the location of the lesion, in mild cases, there may be no symptoms at all, in severe cases, there may even be cardiogenic shock and sudden death. Most patients have a history of viral infection 1-3 weeks before the onset of the disease, with prodromal symptoms such as fever, generalized lethargy, muscle aches and pains, followed by palpitations, chest pain, dyspnea, edema and even syncope and sudden death. The examination often has arrhythmia, with premature beats and atrioventricular block being the most common, the heart rate can be increased, which is not in line with the body temperature, auscultation can be asked about the third and fourth heart sounds or gallop rhythm, and those who have heart failure can have jugular venous fury, wet rales in the lungs, liver enlargement, and so on, and those who are serious can have lower blood pressure and cold and wet limbs, and so on. Adult myocarditis, please go to the hospital in time, the doctor according to the symptoms, signs and auxiliary examination results of a clear diagnosis, and timely treatment, do not blindly use medication, so as not to delay the condition.