The severity of myocarditis in children is related to the type of disease, which can be categorized as mild, moderate or severe. Mild is generally not serious, and moderate and severe are relatively serious. 1. Mild: there are usually no symptoms, most children can be cured within a few weeks or days, usually not serious. 2. Moderate: poor mental status, fatigue, precordial pain, dizziness, headache, palpitations and other symptoms, most patients can be cured with timely treatment. Most patients can be cured with timely treatment. If the disease is prolonged, myocardial damage may occur, which is more serious. 3. Severe: children may have edema, irritability, dyspnea, blood pressure drop, and even life-threatening, is very serious. Children’s myocarditis should be timely consultation, under the guidance of the doctor to take treatment. Regular review should be conducted on a daily basis to regularly monitor the changes in the child’s symptoms, etc.