A 13-year-old boy who has a fever as soon as he goes to school may be caused by previous fever that has not been cured, psychological factors, etc. General treatment as well as medication is the mainstay of the treatment, which is analyzed as follows: 1. General treatment: general treatment is mainly for boys whose body temperature does not exceed 38.5 ℃, for example, you can use a hot towel to wipe the boy’s whole body, especially the palms of the hands, feet and other parts of the body, which can help to dilate the blood vessels, promote blood circulation, and better reduce the body temperature, at the same time, you also need to give more water to the boy. 2. medication: if the boy more than 38.5 ℃, you need to go to the hospital for routine blood tests, if it is a viral infection you need to take acyclovir and other drugs, if it is a bacterial infection, you can use amoxicillin, azithromycin and other drugs, and at the same time, you need to take ibuprofen and other antipyretic drugs treatment. 3. If all organic diseases are ruled out, some children may resist going to school because of psychological factors caused by physiological reactions, it is recommended to go to a professional psychological counseling. The above medications are recommended to be taken under the guidance of a doctor, and should not be used on their own.