Under normal circumstances, after the fracture is treated with external fixation in plaster, the movement of the fracture end will be restricted, and the bruising and swelling caused by the fracture will be gradually reduced and disappeared after 1-2 weeks after taking blood-stasis activating drugs and other symptomatic treatments. However, if the pain becomes more painful, on the one hand, we should consider whether the swelling is more obvious due to poor blood flow to the tissues as a result of too tight fixation of the cast. On the other hand, it is necessary to consider whether the fracture end is displaced again due to the movement of the limb after the cast is fixed. Therefore, it is advisable to consult a doctor in time to further clarify the cause of the pain by reviewing the X-ray examination, and to treat it in time under the guidance of a professional doctor.