According to the reason of pain, casting a fracture is mainly divided into the following categories: normal phenomenon, cast is too tight and the fracture location is deeper, according to the different reasons of pain, you can choose medication, replacement of the cast and surgical treatment. 1. Normal phenomenon: the fracture itself is an abnormal change in the normal physiological structure of the bone, which leads to pain, and the cast is only to promote the healing of the fracture site, and does not have the effect of relieving pain. To cope with this kind of pain, you can choose medication, such as taking non-steroidal antipyretic and analgesic diclofenac sodium, etoricoxib, celecoxib and meloxicam. 2. The plaster is too tight: if the pain is accompanied by cold fingers, numbness and other symptoms. It is mainly due to the tightness of the plaster, resulting in vascular damage and tissue ischemia, which can be relieved by opening the plaster and decompressing it, and then it needs to be re-fixed or replaced. If the swelling of the limb is obvious, medication can be used, such as intravenous mannitol, glycerol fructose, and oral villetin to reduce swelling. 3. Deeper fracture position: Generally, the persistence of pain indicates that the fracture position is deeper, resulting in poor stability of the broken end after cast fixation, we should seek medical treatment and take X-ray film in time, and if it is confirmed that the fracture is unstable, we need to consider surgical treatment. Through the cut-and-replace plate screw internal fixation treatment, the stability of the fracture can be completely restored, and the pain symptoms can be relieved. If the pain of the fracture cast is unbearable, do not be overly nervous, should consult a doctor to find out the cause, according to the cause of the choice of relief methods, and actively cooperate with the doctor treatment.