Patients with leg fever, commonly due to leg trauma, leg infection, as follows: First, leg trauma: leg trauma, including leg muscle, soft tissue strains, as well as leg fractures, dislocations, etc., can cause severe local congestion, adequate blood supply, will lead to increased heat, the patient will show the phenomenon of leg fever, and accompanied by pain, swelling and limited movement, sometimes taking X-rays, MRI, can Sometimes X-ray, MRI, can find the location of the lesion. Second, leg infection: leg infection includes septic infection of soft tissues and septic osteomyelitis, which can lead to the formation of infectious inflammation in the leg, resulting in fever, local pain, and even septicemia. Routine blood tests and bacterial cultures can confirm elevated white blood cells, the type of causative organism, and a sensitive antibiotic. Fever in the patient’s leg should be diagnosed and treated early, especially the infection, which must be completely cured, otherwise it will have serious adverse consequences and may even affect the movement of the limb.