A child’s rapid heart rate may be caused by physiological or pathological factors. Usually, the situation caused by physiological factors does not require excessive worry, while the situation caused by pathological factors requires targeted treatment. I. Physiological factors: There are significant individual differences in heart rate for children of different ages. In general, the heart rate of a newborn child can reach 120-140 beats per minute, while the heart rate of a child born prematurely can reach 140-160 beats per minute. As the child gets older, the heart rate gradually slows down and generally decreases to the adult range as the child approaches adulthood. In addition to this, there are other physiological factors that can cause children to have an accelerated heart rate, such as strenuous exercise, high levels of mental stress, or drinking drinks containing caffeine or theophylline. Second, pathological factors: some diseases can cause children to appear the symptoms of rapid heart rate. 1. congenital heart disease: such as ventricular septal defect, patent ductus arteriosus, atrial septal defect, tetralogy of Fallot, etc., can compensate for the increased burden on the heart and cause an accelerated heart rate; 2. endocrine system diseases: such as hyperthyroidism, due to increased basal metabolism and sympathetic excitability, thus causing an accelerated heart rate. increased, thus causing an accelerated heart rate; 3, anemia: due to the compensatory increase in oxygen consumption of the organism, it will also compensate by increasing the heart rate. In addition, it should be noted that there are some special drugs that can also cause children’s heart rate to accelerate, such as levothyroxine sodium tablets or atropine, etc. Patients need to consult their doctors to see if they need to change the medication.