5-year-old baby fever for no reason without other symptoms may be toddler rash, cold early, gastrointestinal diseases and other causes, according to different causes to choose different drugs treatment. 1.toddler emergency rash: the disease starts rapidly, most of the symptoms without precursor, sudden high fever, within a few hours the temperature rises to 39 ~ 40 ℃ or higher. This disease is mainly symptomatic treatment, children need bed rest, give enough water and easy to digest food, body temperature over 38.5 degrees can be applied to ibuprofen and other antipyretic drugs, in order to prevent febrile convulsions can be given at the same time sedatives, such as chlorpromazine and so on. The prognosis of this disease is good, the course of the disease is short, generally do not use antiviral drugs. 2. Early stage of colds: common in viral colds, in the early stage of colds, some children may only have symptoms of fever, no symptoms such as runny nose, cough, etc., with the gradual development of the disease, may gradually appear runny nose, sneezing, etc., can be diagnosed under the guidance of the doctor to choose the treatment of oseltamivir and other drugs. 3. Gastrointestinal diseases: common in acute gastroenteritis. In the early stage of the onset of the disease, children may appear asymptomatic fever, and then may appear nausea, diarrhea and other gastrointestinal symptoms, can be diagnosed under the guidance of the doctor can choose to use ceftazidime, montelukast and other drugs for treatment. Parents should pay attention to the 5-year-old children’s asymptomatic fever, as soon as possible to take the child to see a doctor, clear cause as soon as possible after the targeted treatment.