Possible causes of pain on the outside of the wrist include stenosing tenosynovitis, rheumatoid arthritis and trauma. 1. Stenosing tenosynovitis: It may be caused by repetitive movements of the wrist for a long time or holding a position for a long time, resulting in stenosing tenosynovitis, and some patients will have symptoms of pain on the outside of the wrist. 2. Rheumatoid arthritis: Rheumatoid arthritis may be triggered by autoimmune, hereditary, infectious, smoking and other factors, the early symptoms of joint pain, the most common parts of the wrist and so on. 3. Trauma: pain on the outside of the wrist may be related to wrist trauma. Because the wrist trauma, easy to damage the internal soft tissue, resulting in patients with localized pain symptoms. Lateral wrist pain may also have other causes, it is recommended to go to the regular hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.