There are two main categories of causes of high fever in children: infectious diseases and non-infectious diseases. 1. Infectious diseases: for example, upper respiratory tract infection, pneumonia, acute glomerulonephritis, etc., is due to bacterial or viral infections, so that the body produces an immune response, in the process of which will occur in the case of elevated temperature, at this time, we must clearly identify the source of the infection, to give symptomatic treatment, but also need to be temporary antipyretic, such as wiping. 2. Non-infectious diseases: such as hyperthyroidism, blood system diseases, etc., this will make the body’s thermoregulatory center abnormal, will also cause an increase in body temperature, active treatment of the original disease can be essentially solve the fever. Children with high fever may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.