The common reasons why the fracture swells again after the swelling subsides include early weight bearing, poor immobilization, and failure to elevate the affected limb. 1. Early weight bearing: For example, if the fracture of the lower limb is fixed in plaster, walking on the ground or bearing weight on the ground in advance will load the fracture site and cause inflammatory reaction, resulting in swelling again. 2. Inadequate fixation: After swelling subsides, the plaster may loosen, leading to inadequate and unstable external fixation, and the fracture site may sway slightly, causing swelling to return after the swelling subsides. 3. Failure to elevate the affected limb: upper limb fracture or lower limb fracture should be properly elevated limb, if the fracture site limb drooped, lower than the horizontal position of the body, it may be difficult to return blood to cause the drooped end of the swelling again. Re-swelling after the swelling of the fracture has subsided may also be caused by other reasons, you should go to the hospital in time for follow-up, under the guidance of the doctor for treatment.