Myocarditis is an inflammatory disease of the myocardium. The clinical manifestations of viral myocarditis in patients depend on the extent and location of the lesions. Mild cases may have no symptoms at all, while severe cases can lead to cardiogenic shock or even sudden death. Most patients may have prodromal symptoms of viral infection one to three weeks before onset, such as fever, general fatigue, muscle soreness, or gastrointestinal symptoms like nausea and vomiting. Subsequently, they may experience palpitations, chest tightness, difficulty breathing, edema, fainting, or sudden death.