Possible causes of thumb joint jamming include stenosing tenosynovitis, gouty arthritis, osteoarthritis and so on. 1. Stenosing tenosynovitis: due to long-term frequent hand labor such as computer typing, the tendon sheath produces mechanical friction, causing aseptic inflammation, resulting in local pain in the affected finger, accompanied by symptoms of thumb joint jamming. 2. Gouty arthritis: it may be related to abnormal purine metabolism, hyperuricemia and genetic factors, etc. In severe cases, it may involve the hand, and the symptom of thumb joint jamming may appear. 3. Osteoarthritis: caused by the degeneration and destruction of articular cartilage and osteophytes. Osteoarthritis can be present in any part of the body and fingers are no exception. Osteoarthritis can result in the symptom if the joint surfaces of the thumb wear out and develop osteoarthritis. There may also be other causes of thumb joint jamming, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment under the guidance of the doctor.