Swelling of the foot after a sprain is considered to be due to soft tissue contusion and laceration of the ankle joint, and it may also be due to rupture of blood vessels at the ankle caused by the sprain, which in turn leads to the formation of hematoma. There is no quick way to reduce the swelling, and the clinic needs to give general treatment, physical therapy, medication and surgery according to the condition and other comprehensive treatment. 1. General treatment: after a sprained foot, you need to reduce the activity of the ankle, if necessary, give local braking, you can also elevate the affected limb to promote blood return, which is conducive to swelling. 2. Physiotherapy: In the acute stage of sprained foot swelling, it is recommended to give local cold compresses, which can reduce local tissue exudation, and can constrict blood vessels to reduce bleeding. The relief period can be given local hot compresses, promote local blood circulation, and then play the role of swelling and pain. 3. Medication: Mannitol and other dehydrating agents can be used to promote swelling, accompanied by obvious pain, ibuprofen and other painkillers can be used. 4. Surgery: If the hematoma in the foot is large and cannot be absorbed by itself, surgery can be given to incise and drain, and if there is a fracture of the ankle joint which cannot be treated conservatively, it is necessary to give the treatment of incision and internal fixation. It is recommended that patients go to the hospital to improve the auxiliary examination, in order to clarify the condition, the drug needs to be used under the guidance of a professional physician.