There are many symptoms of myocarditis in children, which may include chest tightness, chest pain, fever, malaise, dyspnea, abdominal pain, vomiting, poor spirit, etc. The performance of each child varies, and the severity of symptoms is also different. In mild myocarditis in children, there may be mild discomfort in the chest area, dizziness, fatigue, etc., which can generally be relieved by rest, nutrition of the myocardium and other symptomatic treatments. Need to be vigilant is the violent myocarditis, the initial symptoms can be atypical, some first manifested as vomiting, fever, abdominal pain and other symptoms, and then the rapid development, causing chest tightness, chest pain, convulsions, poor mental health, coma, respiratory distress and other conditions, the serious cases can be life-threatening. If children have symptoms of myocarditis, it is recommended that they go to the hospital in time to avoid delaying their condition.