The distal radius fracture is still sore and swollen in the wrist after 4 months, which is mainly considered to be related to poor fracture healing, traumatic inflammation, and poor local blood circulation. 1. Poor fracture healing: the distal radius fracture has been 4 months, if the phenomenon of poor local fracture healing, it is easy to produce wrist soreness and swelling, and even affect the function of the wrist joint. 2. Traumatic inflammation: after the fracture of distal radius, it may be complicated by local traumatic arthritis, and the stimulation of inflammation may lead to the increase of exudate, so that the wrist is still sore and swollen after 4 months of fracture. 3. Poor local blood circulation: after the distal radius fracture, it is easy to be accompanied by surrounding tissue damage, such as peripheral vascular damage, so in the process of recovery, there may be a problem of poor local blood circulation, which leads to wrist soreness and swelling, and lasts for a long time. During the process of fracture recovery, pay attention to regular review, if the distal radius fracture still exists 4 months of wrist swelling, you need to go to the orthopedic department, to clarify the cause, and under the guidance of a professional doctor targeted treatment.