High cardiac enzymes in young children may be caused by physiological factors such as lack of sleep, or may be caused by diseases such as myocarditis. 1. Physiological factors: myocardial enzymes include creatine kinase, lactate dehydrogenase and other substances, and factors such as strenuous exercise in young children may lead to mild elevation of myocardial enzymes, such as creatine kinase (CK) and its isoenzymes, etc., which are generally of no clinical significance and are normal physiological phenomena. 2. Pathological factors: myocarditis is an acute and chronic inflammatory lesion of the myocardium, often associated with viral infection, autoimmune disease, external stimuli and other factors. When the damaged range of myocardial cells of the affected children gradually increases, cardiac enzymes will also gradually increase, and accompanied by weakness, panic and other symptoms. When a child becomes unwell, he or she should go to the hospital immediately.