12-year-old children with fever, if the temperature does not exceed 38.5 degrees, can be temporarily without medication. If the temperature exceeds 38.5 degrees, need to eat ibuprofen and other antipyretic symptomatic treatment, and identify the causes of fever, treatment, such as influenza children need oral oseltamivir phosphate. For children with fever, symptomatic antipyretic is very important to reduce the discomfort caused by fever. If the temperature does not exceed 38.5 degrees, you can not take antipyretic treatment, to physical cooling, such as warm water baths. If the temperature is more than 38.5 degrees, you need to take oral ibuprofen or acetaminophen and other antipyretic drugs under the guidance of a doctor to reduce fever. 12-year-old children with fever, in addition to symptomatic fever, but also need to identify the cause of fever targeted treatment. If influenza is considered, oral treatment with oseltamivir phosphate is needed. If the bacterial infection caused by acute purulent tonsillitis need oral cefaclor anti-infection treatment. If the diagnosis is infectious mononucleosis then oral acyclovir therapy is required, with intravenous infusion if necessary. 12-year-old child fever may also have other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, give targeted treatment or treatment.