Children’s fever leg pain may be due to influenza, or due to acute myositis and other reasons. 1. Influenza: after children’s influenza fever, the blood vessels in the limbs contract, and there will be ischemia in the legs, leading to an increase in local metabolic products, there will be ischemia in the legs, due to ischemia or slow blood flow, the above mentioned substances can not be discharged or taken away in a timely manner, and fever and leg pain may occur. 2. local inflammation: due to pathogens may lead to local muscle inflammation, which may be manifested as fever leg pain in children. There may be other reasons for children’s fever and leg pain, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.