Fever does not cause polio, but fever is an early symptom of polio and can be accompanied by headache, runny nose, nausea and vomiting. Polio is an acute infectious disease caused by poliovirus, also known as poliomyelitis. The onset of polio can be 1 to several days of fever, can be accompanied by respiratory symptoms such as runny nose, cough, etc., gastrointestinal symptoms such as nausea, vomiting, diarrhea, etc., and some may also appear to be general malaise, hyperhidrosis, and is often confused with upper respiratory tract infections. The diagnosis of polio prodrome is extremely difficult, first of all, we need to know whether we have eaten polio sugar pills, there is no history of exposure, and then carefully observe the early symptoms of the child. If the child has a history of exposure and has not taken polio pills, the child should be examined in the hospital as soon as possible.