Hot after foot sprain is due to aseptic inflammation, stasis fever, etc., as follows: 1, aseptic inflammation: due to sprain after injury to the foot ligaments, the most common is the anterior talofibular ligament, the posterior talofibular ligament, heel fibular ligament, as well as the medial deltoid ligament, ligaments between the appendages, etc., these ligaments are pulled after the injury will be exudate, the increase in permeability of the capillaries, the oozing of the skin after the subcutaneous swelling, the temperature will rise. The temperature will rise. Touch the skin temperature increases, it is due to localized aseptic inflammation. Second, blood stasis and fever: Chinese medicine believes that after a sprain, the local blood vessels rupture, capillaries ooze out, there will be blood stasis, blood stasis will become heat after a long period of time, so the local area will be hot. Chinese medicine believes that it is mainly caused by blood heat, also called blood stasis fever, so the treatment of cooling blood and clearing heat can improve the performance of localized hot.