Middle finger joint pain and swelling may be tenosynovitis, osteoarthritis, rheumatoid arthritis, as well as fractures and other factors. 1. Tenosynovitis: Tenosynovitis may be caused by trauma, infection, chronic strain and other factors. Patients will experience localized pain, limitation of the affected joints, pressure and pain, and other symptoms. If the patient has tenosynovitis in the middle finger, it will manifest as pain and swelling. 2. Osteoarthritis: The cause of osteoarthritis is still unclear, and it may be caused by metabolic disorders, overloaded joints, injuries and other reasons. Patients will have joint pain, hardness, swelling, deformity and other manifestations, so patients with osteoarthritis of the middle finger may have localized joint pain and swelling symptoms. 3. Rheumatoid arthritis: some studies have shown that rheumatoid arthritis is related to heredity and autoimmune factors. Patients will show that the joints of fingers are swollen and painful, and thus patients will have the performance of middle finger joint pain and swelling. 4. Other: patients with middle finger joint pain and swelling may also be fracture, gout, bone tumor, bone tuberculosis and other diseases. It is recommended that patients with middle finger joint pain and swelling need to consult a doctor in a timely manner, the doctor will choose the appropriate measures for the cause of the treatment.