Myocarditis is primarily an inflammatory disease of the heart muscle, and myocarditis in children can be divided into viral myocarditis and fulminant myocarditis depending on the severity of the disease. The early symptoms of viral myocarditis are generally mild or inconspicuous, while the early symptoms of fulminant myocarditis are more serious and develop faster, so the early symptoms of different types of myocarditis vary somewhat and are not limited to 8. 1. Viral myocarditis: early symptoms may be absent or inconspicuous, with circulatory symptoms more common, manifesting as chest tightness, palpitations, pallor, fatigue, muscle The symptoms are chest tightness, palpitations, pallor, fatigue, muscle aches and pains, and may worsen when the child is active. The children may have a history of viral infection before these symptoms appear, and if the infection is not controlled in time and continues to develop, the early symptoms of myocarditis will gradually appear; 2. Fulminant myocarditis: The early symptoms of fulminant myocarditis are mostly neurological and digestive symptoms, and the neurological symptoms are mainly convulsions and syncope, which are generally severe. Digestive system symptoms are mainly loss of appetite, nausea, diarrhea, etc., which are easily confused with the symptoms produced by gastrointestinal diseases and are not easily identified. In addition, respiratory symptoms, such as fever, cough, and runny nose, may also occur early in the disease. However, the onset of fulminant myocarditis is rapid, and once it develops, high fever, respiratory distress, and peripheral circulatory disturbances may occur within a short period of time, and cardiogenic shock may occur early in the disease. In addition to the above symptoms, older children may also present with symptoms such as precordial pain early in life, and children with fulminant myocarditis may also present with arrhythmias and irritability when examined. It is important to note that the main cause of myocarditis in children is infection by a variety of pathogens, with viral infections being more common, so if a child develops a viral infection, antiviral treatment should be administered promptly according to the condition to avoid the development of myocarditis, which can make treatment more difficult.