6-year-old children with recurrent high fever may be seen in pneumonia, infectious mononucleosis, Kawasaki disease, etc., usually medication and so on. 1. Pneumonia: Mycoplasma pneumoniae is a common type of pneumonia in school-age children and adolescents, at the beginning of the disease, there is general malaise, malaise, headache, 2~3 days after the fever, body temperature up to 39.0 ℃, lasting 1~3 weeks, can be accompanied by sore throat and muscle pain, this time, erythromycin, azithromycin, dextromethorphan, ibuprofen and other medications can be used to treat the disease. 2. Infectious mononucleosis: it is caused by EBV infection, manifested as fever, body temperature 38~40℃, lasting 1~2 weeks, a few up to several months, accompanied by pharynx, tonsil congestion, swelling, cervical lymph node enlargement and other symptoms. The main symptomatic treatment should be given, physical hypothermia should be given in case of fever, and antiviral treatment such as acyclovir and ganciclovir should be applied according to the doctor’s prescription. 3. Kawasaki disease: temperature up to 39 ~ 40 ℃, lasting 7 ~ 14 days or longer, antibiotic treatment is ineffective, accompanied by bulbar conjunctival congestion, strawberry tongue, fingertip desquamation, cervical lymph node enlargement, etc., can be prescribed the use of ibuprofen, aspirin, intravenous immunoglobulin, prednisone acetate and other drugs, the presence of severe coronary artery disease requires surgical treatment. There are many other causes of recurrent high fever in 6-year-olds, and it is recommended to consult a doctor in a timely manner to clarify the cause of the disease and target treatment. All of the above drugs should be used under the guidance of a doctor, avoid self-medication.