Ulnar pain at the wrist may be caused by physiological factors such as exertion, or it may be caused by ulnar fracture, osteoarthritis, tenosynovitis, rheumatoid arthritis and other factors. 1. Physiological factors: due to heavy physical labor, lasting for a long time, it may cause pain in the ulna area of the wrist, which can gradually return to normal after sufficient rest. 2. Fracture of the ulna: If the wrist suffers an external blow, resulting in a fracture of the ulna, there will be pain in the wrist, accompanied by swelling and obvious limitation of movement. 3. Osteoarthritis: It may be related to degenerative joints and chronic strain injury, causing aseptic inflammation of the wrist joint, resulting in pain symptoms, especially when cold or overworked, the pain symptoms may be aggravated. 4. Tendovaginitis: it may be related to prolonged manual labor, catching cold and other factors, which can lead to local damage of tendon sheath, causing obvious pain in the wrist, especially when overworked, the pain is obviously aggravated. 5. Rheumatoid arthritis: rheumatoid arthritis, involving the wrist joint, will also cause symptoms of wrist pain, may also be accompanied by morning stiffness, activity restrictions, and in severe cases will lead to deformity. If the ulnar pain in the wrist lasts for a long time or is accompanied by other obvious abnormal symptoms, it is recommended that the patient consult a doctor in a timely manner for the appropriate examination to clarify the cause of the disease and then targeted treatment.