Swelling of the leg may be caused by soft tissue injury or fracture, and the way to reduce swelling includes physical therapy, medication and surgical treatment. 1. Soft tissue injury: after the leg is bumped and caused local soft tissue congestion and edema, the affected limb should be braked first to avoid secondary injury; at the same time, ice packs and elevation of the affected limb should be given to promote the contraction of small subcutaneous blood vessels and venous reflux; after 72 hours, it can be changed to hot compresses, and at the same time, it can be used to massage the muscles around the injury to promote the discharge of metabolic products. 2. Fracture: leg fracture may cause edema after being hit by the leg, most of the patients with leg fracture are recommended to undergo surgical treatment of incision and internal fixation, or you can choose the conservative treatment of plaster or support fixation. If the swelling is serious, you can take medicines such as mannitol and sodium heptapartite saponin to reduce the swelling. All of the above medications should be used under the guidance of a doctor, avoid self-medication. If the patient’s symptoms are not relieved, or accompanied by other symptoms, the patient should go to the hospital in a timely manner, after clarifying the cause to give targeted treatment.