Fever is a common clinical symptom in pediatrics, and the causes of fever without other symptoms in children are physiological fever, such as the environment, heatstroke, etc.; pathological fever, such as infections, early childhood emergency rashes; vaccination, etc. 1. Physiological: weather causes, such as in the hot summer, hot summer is most likely to heatstroke, and the child’s age, resistance is weak, only fever without other symptoms may be summer fever syndrome, when the external environmental temperature rises, the child’s body temperature also rises fever, but other symptoms of discomfort will not be very obvious. 2. Infection: some infectious diseases early manifestations of only fever, may not be accompanied by other symptoms, with the progress of the disease gradually appear other symptoms, such as infantile emergency rash, the specific will be manifested as a recurrent high fever for three or four days, but will not be accompanied by other symptoms, only in the fever a few days after the rash will appear on the skin. 3. After vaccination, the immune response of fever may also occur, no need to worry too much, as long as you give your child more reasonable conditioning after vaccination, this response can slowly subside. When the child fever does not appear other symptoms, the first to give the child diligently drink water, timely elimination of toxins in the body, and appropriate reduction of clothing, especially in hot and dry weather, in order to promote the body surface of the natural heat dissipation. Seek medical attention if necessary.