The main reason why a child has a fever but no other symptoms is because the fever is basically due to an infection, which in its early stages does not show many typical symptoms, indicating that the disease is in its early stages. Some children have fever due to infection by some pathogenic bacteria, such as mycoplasma infection, which will have fever in the early stage, while other symptoms are not obvious. In addition, if there is a urinary tract infection, gastrointestinal inflammation or acute bronchitis, in the early stages of the disease, often only fever manifestation, other symptoms usually after the development of inflammation, gradually manifested. It is recommended that children with fever go to the hospital in a timely manner to find out the cause of the fever, and then give symptomatic treatment as well as reduce the heat treatment.