The causes of leg fever may be the following: 1, may be the leg muscle or soft tissue aseptic inflammation, usually the legs often do heavy physical labor or physical exercise people are more common, a long time will appear muscle strain, muscle aseptic inflammation will also slowly appear, this situation in addition to local fever, there will be local swelling or pressure pain feeling. 2, may be the local soft tissue bacterial infection caused by the wound, not timely disinfection treatment, also appear bacterial infection, or other places on the body after the bacterial infection, bacteria through the blood circulation. The local soft tissues may be caused by bacterial infection, common is the epidermis has a wound, not timely disinfection treatment, but also bacterial infection, there may be other places on the body after the bacterial infection, bacteria through the blood circulation invasion to the calf muscle or soft tissue induced, and bacterial infection, in addition to local redness, swelling, heat, pain, serious will also appear to have local inflammatory skin secretions 3, there may be nerve sensory abnormalities in the legs and fever, common in some lumbar spine diseases, such as lumbar disc herniation, lumbar spinal stenosis or lumbar spondylolisthesis compression of the nerve roots of the lower extremities, causing nerve sensory abnormalities in the lower extremities, but also fever symptoms, there may also be the posterior tibial nerve or common peroneal nerve of the knee joint neurogenic inflammation of the posterior tibial nerve or common peroneal nerve of the knee, which may also cause fever in the legs.