The severity of myocarditis in children needs to be assessed by considering the child's clinical symptoms and corresponding clinical examinations comprehensively. Common clinical symptoms include chest tightness, fatigue, shortness of breath, etc. Most children have a history of upper respiratory tract infection before the symptoms appear. It is necessary to conduct routine blood tests, myocardial enzymes, troponin, myocardial antibodies, viral antibodies, electrocardiograms, and other relevant physicochemical examinations to further clarify the condition. Patients with mild symptoms and roughly normal laboratory results can improve on their own with rest. If there are clinical symptoms such as chest tightness, fatigue, shortness of breath, and related physicochemical examinations show abnormal changes, it is necessary to use medication to nourish the myocardium. During treatment, rest is advised, reduce fatigue, maintain emotional stability, and generally, the symptoms can improve within 10 to 15 days. For more severe cases, the treatment period may need to be extended accordingly.