Fast heartbeat in children with fever is mostly due to the invasion of bacteria and viruses, causing the symptoms of upper respiratory tract infection caused by fever, rapid heartbeat caused by high fever, you can drink more water, pay attention to rest, supplement vitamin C, try to avoid going to places where there are many people to prevent cross-infection, be alert to the phenomenon of dehydration and convulsions caused by high fever. You can take oral anti-cold medication, pediatric aminophenol xanthamine granules can treat and relieve the symptoms of fever caused by cold. When a child has a rapid heartbeat with fever, most of them are caused by wind-heat colds. You can take oral medications such as Blue Scutellaria Oral Liquid, Pu Di Lan Anti-inflammatory Oral Liquid, Qing Kai Ling Granules and Ban Lan Gen Granules to clear the heat and detoxify the toxins. You can also use the Chinese herbal soup Yin Qiao San plus reduction, which has the effect of cooling and relieving symptoms. When a child has a fever, he or she needs to eat a light diet with less spicy and stimulating, oily food to avoid fueling the heat evil in the body and causing a rise in body temperature.