The reasons why the patient’s foot is not swollen for a long time include no plaster braking, elastic bandage fixation, and elevation of the lower limbs, as follows: 1, no plaster braking: a fracture may have occurred when the foot is broken, and if there is no plaster braking, and continue to walk on the ground, the fracture will be caused to displace, and there will be an aggravation of swelling and pain, and sometimes there will be a local deformity of the joints. 2, no elastic bandage Fixation: after a broken foot is not fixed with an elastic bandage, it will make it difficult to repair the damaged ligaments, which will cause swelling for a long time. 3, no elevation of the lower limbs: although the broken foot is fixed with an effective plaster, but the lower limbs are not raised during the fixation period, which may cause the blood of the foot to be difficult to return to the area, and a large amount of blood stagnates in the damaged area, which will cause the swelling to persist.