The common causes of wrist ulnar pain include chronic strain, trauma, bone cysts, tenosynovitis, etc. 1. Chronic strain: If the patient carries heavy objects by hand for a long time, it is easy to cause chronic strain of the wrist muscles, and the cold stimulation is easy to cause pain in the wrist ulnar bone. 2. Trauma: if the patient’s wrist ulna is hit by external impact, it is easy to cause soft tissue damage and then inflammation reaction, causing pain at the ulna, or in severe cases, ulna fracture, intense pain. 3. Bone cysts: a kind of cyst-like lesions occurring in the bone, most patients do not have obvious symptoms, some patients with ulnar bone cysts will produce obvious pain. 4. Tenosynovitis: tenosynovitis is a kind of sterile inflammation, when the inflammation attacks, it is easy to cause ulnar pain at the wrist, and may also be accompanied by joint stiffness, restricted movement. Wrist ulnar pain is caused by a variety of reasons, may also be related to muscle strain, osteophytes, osteoarthritis and other diseases, if the symptoms continue to be unrelieved, it is recommended to go to the hospital in a timely manner, by the doctor to identify the cause of the disease, targeted treatment.