The reasons why the patient’s foot is not swollen for a long time, including no cast braking, elastic bandage fixation, elevated lower limb, are as follows: 1, no cast braking: it may be that a fracture occurred when the foot was fractured, if there is no cast braking, continue to walk on the ground, it will cause fracture displacement, there will be increased swelling, increased pain, and sometimes local joint deformity. 2, no elastic bandage Fixed: The foot fracture is not fixed with elastic bandage, which will make it difficult to repair the damaged ligament and cause swelling for a long time. 3, no lower limb elevation: Although the foot fracture is fixed with an effective cast, the lower limb is not elevated during the fixation period, which may cause the blood in the foot to be difficult to return, and a large amount of blood pooling in the injury site, which will cause the swelling to continue to not subside.