The causes of myocarditis include infections, autoimmune factors and physicochemical factors. There are many known causes of myocarditis. The most common cause is viral infections, followed by bacterial, fungal, spirochete and rickettsial infections, which can also cause myocarditis, but are less common. In addition, a number of non-infectious factors can also lead to myocarditis, mainly including drugs, toxins, radiation, vasculitis, connective tissue disease, giant cell myocarditis and nodular disease. Myocarditis is an acute or chronic inflammatory lesion of the myocardium that is either limited or diffuse. Patients with myocarditis have varying degrees of severity and severity of the disease; mild cases may be asymptomatic or have symptoms such as nausea, vomiting, and fever, while severe cases may present with cardiogenic shock, heart failure, and sudden death from severe arrhythmias. Since most myocarditis is caused by viral infections, care should be taken to prevent respiratory and intestinal infections. If you have symptoms of heart discomfort such as chest tightness and panic, you should go to the hospital in time for an ECG, x-ray examination, etc., to clarify the cause of the disease and get timely treatment under the guidance of the doctor.