Foot sprains generally do not cause fever, individual patients may have fever when a fracture occurs, the details are as follows: First, for most patients, the occurrence of foot sprains only soft tissue injury, the patient will not have fever, only local pain, swelling, and limited activity. Second, if a foot fracture occurs, such as an inner ankle fracture, an outer ankle fracture, or even a serious double or triple ankle fracture, there will be local bleeding, severe swelling, bruising or tissue necrosis, which will be reabsorbed through blood circulation and will stimulate the autoimmune system and cause hypothermic symptoms, and the patient will have mild discomfort, but it will not affect the patient’s normal rest. Usually the measured temperature will not exceed 38℃, and the blood routine shows only mild elevation of white blood cells, which will gradually return to normal level in a short period of time.