Myocarditis in children is usually caused by fever, or subsequent to some viral infectious diseases. That is to say, myocarditis can accompany symptoms of fever, but it is generally due to fever, which in turn is caused by some viral infectious diseases that lead to myocarditis. Therefore, if a child with myocarditis also has fever, it indicates the presence of an infectious disease or viral infection. In such cases, in addition to treating the primary fever-inducing illness, attention must also be given to the treatment of the myocardium with nutritional medications. If a child has myocarditis, it is crucial to ensure plenty of rest, avoid strenuous activities, and prevent the disease from becoming protracted and unresolved, which could affect the clinical outcomes. (Medication should be administered under the guidance of a doctor.)