A child’s fever with a hot upper body and a cold lower body may be due to the disturbance of the thermoregulatory center and the difference in blood circulation between the upper and lower body. Generally speaking, the blood circulation of the upper body is much richer than that of the lower body, so if the blood vessels are contracted under the influence of the fever-causing source, it will easily lead to the phenomenon of coldness in the lower half of the body. Secondly, the children’s nervous system is not yet perfect, responsible for the management of vascular diastole, contraction of the vegetative nerve is prone to disorders, in the fever, the end of the lower extremities of the small blood vessels in the spasmodic contraction state, which causes the upper body hot lower body cool. If the child’s fever temperature is relatively high, in 38.5 degrees or more, can be under the guidance of the doctor oral ibuprofen suspension to carry out the treatment of fever, if the fever temperature is not particularly high, can be through the warm water scrubbing, paste the fever patch and other ways to carry out physical cooling. The child’s fever is hot on the upper body and cold on the lower body, there may also be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment. The above medication is in accordance with the doctor’s instructions.