Middle joint pain of the middle finger may be caused by stenosing tenosynovitis, osteoarthritis, rheumatoid arthritis and so on. 1. Stenosing tenosynovitis: Stenosing tenosynovitis is caused by mechanical friction, which leads to tissue proliferation and hypertrophy in the tendon sheath, and the tendon sheath is narrowed, resulting in localized pain, pressure, and restriction of movement. 2. Osteoarthritis: Osteoarthritis is degenerative changes of articular cartilage and secondary osteophytes, often involving finger joints, which can lead to joint pain, swelling, and limitation of activities. 3. Rheumatoid arthritis: Rheumatoid arthritis is a systemic disease characterized by inflammatory synovitis, which can also lead to the symptoms. Middle finger middle joint pain may also be caused by other reasons, it is recommended to go to the hospital in time, improve the examination by the doctor to give timely treatment.