The specific reasons why children have fever without symptoms of cold are as follows: First, it may be the early manifestation of cold, the child just has the symptoms of fever as the first manifestation, followed by sneezing, runny nose and other symptoms after 2-3 days, parents just need to give treatment according to the temperature of the baby’s fever, to treat the symptoms. Second, may be gastrointestinal diseases, such as acute gastroenteritis, viral enteritis or bacterial enteritis, early may only fever symptoms as the main performance, followed by changes in appetite, there may be nausea, vomiting, diarrhea and other symptoms, according to the temperature of the fever, high fever can be given oral antipyretic drug treatment, low fever can be given physical cooling, while observing the child’s gastrointestinal tract response. The symptoms of urinary frequency and urgency will occur in individual children with inflammation of the urinary system. As the child wears diapers, the symptoms of urination may be concealed, and the parents will only notice that the child has urinary system changes after fever symptoms appear.