If the swelling does not go down all the time after the fracture, first of all consider the inflammatory reaction caused by the injury, but also pay attention to the organic disease caused by it. After the fracture, swelling occurs at the fracture site because of the local release of inflammatory factors after the fracture, and under their action, they eventually cause intertissue edema and swelling of the limb, but these are normal reactions and take some time to recover. Especially in the lower extremities, it takes some time to recover because of the relatively poor blood circulation, but some should also pay attention to the presence of vascular inflammation, serious muscle damage, and the possibility of other chronic complications after the fracture, and if it is caused by more serious diseases, the edema of the injury site may take longer, especially in patients with lower extremity edema, pay high attention to the presence of If the edema disappears after the fracture and appears again after a period of time, an ultrasound examination of the lower extremity should be performed to determine if the edema is caused by a venous thrombosis of the lower extremity, and also to pay attention to the presence of foreign bodies in the injured area, bone fragments lacerated adjacent tissues, etc. Therefore, for patients with long-term edema after the fracture, an examination should be performed to determine whether the edema is a normal reaction or caused by other The patient should be examined to determine whether the edema is a normal reaction or a result of other causes. In conclusion, local swelling is normal in patients with fractures. If the swelling is prolonged or re-swollen after the swelling has subsided, it should be taken seriously and actively tested to find the cause.