In children with myocardial ischemia, the symptoms often vary in severity, and sometimes the severity of the symptoms is also related to the actual age of the patient. In the case of infants and young children, the symptoms may not be very obvious, and it is difficult for the patient to complain of any uncomfortable symptoms. Some patients may show weakness, panic, palpitations, chest tightness, chest pain, and may be accompanied by severe arrhythmias, and some patients may even experience cardiogenic shock. Therefore, for patients with myocardial ischemia, it is important to identify the cause of myocardial ischemia in children. The more common causes are anemia and viral myocarditis, and patients are advised to undergo myocardial enzymology, cardiac ultrasound and electrocardiography, and if necessary, further cardiac MRI. Therefore, the symptoms of myocardial ischemia in children tend to vary widely, but when myocardial ischemia is present, the patient’s discomfort will increase after activity.