Sudden fever in children needs to be treated according to the cause, infectious fever should be treated with antibiotics, and non-infectious fever needs to be treated for the cause. 1. If the fever is caused by infection, when the body temperature is below 38.5 ℃, you can first use physical cooling, such as rubbing alcohol in the sweat glands, etc., when it is greater than 38.5 ℃, you need to use antipyretic drugs under the guidance of the doctor, such as ibuprofen suspension, acetaminophen suspension, etc.; and the use of antibiotics such as cephalosporin, penicillin, etc.. 2. If the fever is non-infectious, such as endocrine disease hyperthyroidism caused by fever, need to be selected under the guidance of the doctor to use anti-thyroid drugs such as methylthiouracil, systemic lupus erythematosus due to the use of glucocorticoids and immunosuppressive drugs, etc.. Fever phenomenon suggests timely consultation, identify the causes, under the guidance of the doctor for treatment, daily attention to diet and hygiene, pay attention to the child to keep warm.