The specific causes of fever without symptoms are as follows: 1, the baby in the acute upper respiratory tract infection or pediatric acute bronchitis, pneumonia, the early stage can only have fever as the main manifestation of the symptoms, early according to the child’s fever to give antipyretic treatment can be, pay attention to the observation of the baby’s concomitant symptoms, so as to clarify the causes of fever. 2, there are a number of gastrointestinal diseases, such as acute gastroenteritis, the early baby May only have fever manifestation, then the baby has anorexia, do not want to eat the performance, there may be nausea, vomiting, diarrhea will occur, these may be the early manifestations of the disease, has not responded to other diseases, so alone to fever as the main manifestation. 3, urinary tract infections, due to the baby pads or parents did not pay attention to the baby’s urinary anomalies, only after the emergence of fever symptoms, the parents will identify the child is the cause of the disease. Parents will only identify the child is the cause of the disease, only to find the cause of fever, this situation may also be the early symptoms of acute urinary tract diseases.