Myocarditis is a disease in which the myocardium develops an inflammatory response due to various physical and chemical factors. The most common cause of myocarditis is viral infection, i.e. viral myocarditis. Other causes such as bacterial, fungal, helminth, rickettsial, protozoan, and helminth infections can also cause myocarditis, but are relatively uncommon. In addition to this, some non-infectious factors including drugs, toxins, and radioactive damage can also cause myocarditis; in addition, some systemic diseases such as connective tissue disease, vasculitis, and nodular disease may also cause myocarditis. A variety of diseases can cause myocarditis, of which coxsackie group B virus, orphan virus, and poliovirus are common, especially coxsackie group B virus is the most common cause. Other viruses, such as human adenovirus, influenza virus, rubella virus, herpes simplex virus, encephalitis virus, hepatitis virus, EBV, cytomegalovirus, and human immunodeficiency virus can cause myocarditis. The most common cause of myocarditis is inflammatory damage to the myocardium caused by various viral infections. Its early manifestations vary, thus prompt medical attention is required once symptoms such as palpitations, chest tightness and chest pain are present after various infections.