Pain in the left ring finger joint may be caused by trauma, gout, tenosynovitis, rheumatoid arthritis. 1. Trauma: If the left ring finger is injured due to strenuous activities in the patient’s life, the joint of the left ring finger will show symptoms of pain, and it is recommended that the patient can go to the hospital for consultation and symptomatic treatment under the guidance of the doctor. 2. Gout: Gout is a kind of crystalline arthritis, which is caused by the precipitation of monosodium urate. In gout attack, there will be redness, swelling, heat and pain in metatarsal, toe, tarsal and ankle joints, and in serious cases, it will involve the pain in the left ring finger joint. 3. Tenosynovitis: Tenosynovitis is a sterile inflammation caused by long-term friction of tendons in the tendon sheaths, which results in swelling of the affected area, leading to pain in the joints of the ring finger of the left hand. 4. Rheumatoid arthritis: If the patient suffers from rheumatoid arthritis, rheumatism will attack the small joints of the body, which will also lead to pain in the joints of the ring finger of the left hand, which may be accompanied by morning stiffness, and in severe cases, joint deformity will also occur. It is recommended to consult a doctor for timely treatment of symptoms of pain in the left ring finger joint.