Incidence of young adults are more often first, the performance of primary infection, such as viral fever were frequent vomiting, diarrhea, cough, sore throat and muscle aches, etc. Most of the viral infection 1-3 weeks after the symptoms of myocarditis, arrhythmias can cause palpitations as a result of ejection lowering the volume a sense of weakness involving the pericardium and the pleural membrane and chest when the chest pain of angina may also have similar performance in severe cardiac dysfunction common signs of sinus tachycardia is not parallel with the body temperature may also have sinus bradycardia and various community to expand cardiac arrhythmia accounted for 1/3-1/2 found severe myocarditis due to enlargement of the heart can cause mitral or tricuspid regurgitation or sternal apical systolic murmur left lower margin of myocardial damage may have heard of serious or diastolic heart failure period gallop first heart sound may weaken the merger pericarditis pericardial friction sound heard

Light can completely asymptomatic heart failure or sudden death in serious cases the performance gap based on the clinical manifestations can be divided into six types: ① asymptomatic type: 1-4 weeks after infection occurs S-T changes in ECG ② asymptomatic arrhythmia type: the performance of the types of arrhythmia ventricular premature beat ③ most common type of heart failure: the emergence of heart failure symptoms and signs of myocardial necrosis ④ Type: Clinical presentation was similar to a large myocardial infarction by ⑤ heart: Mitral and tricuspid valve area enlargement of the heart contraction in phase noise ⑥ sudden death type: sudden death without aura