Pain under the wrist may be caused by strain, trauma, carpal tunnel syndrome or tumor. 1. Strain: If you often engage in heavy physical labor and overuse your wrist, it will easily lead to the accumulation of a large amount of lactic acid in the local area, which will lead to the symptom of pain under the wrist, which is usually mainly soreness. 2. Trauma: If the lower part of the wrist is injured by external force, resulting in local soft tissue congestion and edema or fracture, etc., pain symptoms will also occur, usually with swelling and ecchymosis and other manifestations. 3. Carpal tunnel syndrome: if there is carpal tunnel syndrome, usually there will be pain under the wrist and numbness in the fingers. 4. Tumor: If there are tumors under the wrist, such as endogenous chondrosarcoma and giant cell tumor, etc., due to the invasion and compression of the tumor, it will also lead to local pain. The pain under the wrist may also be caused by other reasons, which should be examined in regular hospitals to make a clear diagnosis, so as to deal with the problem in a targeted way.