If the patient has a history of trauma, consider it to be caused by a fracture or dislocation of the wrist joint. At this time, the wrist joint should be immediately braked to avoid aggravating the fracture displacement or damaging the surrounding blood vessels and nerves, and then immediately consult the hand and foot surgery for further treatment; if the patient has no history of trauma, consider it to be caused by a tumour in the hand, often a tendon sheath cyst, giant cell tumour, haemangioma, endogenous chondroma, etc. At this time, it is also necessary to consult the hand and foot surgery for further examination and treatment.