There are many diseases that need to be alerted to the joint pain of the middle finger of the left hand, and trauma, tenosynovitis or tenosynovial cysts, rheumatism, rheumatoid arthritis, gout, bone tumors and other causes are generally considered. It is necessary for the physician to take appropriate treatment measures and methods according to the different causes of the patient’s illness. 1. Trauma: If the middle finger of the left hand is subjected to violence or violent impact, the joint pain of the middle finger may occur, which may be accompanied by joint dysfunction. Trauma usually causes soft tissue injury, joint dislocation, fracture and so on. 2. Tenosynovitis or tenosynovial cysts: usually seen in hand labor workers, may appear in the middle finger joint pain with dysfunction and other manifestations. 3. Rheumatoid arthritis: it is an autoimmune disease, which may cause morning stiffness, accompanied by redness, swelling and pain in the joints and dysfunction. 4. Gout: due to the increase of uric acid, as the disease progresses, gout stones can be formed and symptoms such as joint pain in the left middle finger. 5. Bone tumor: generally manifested by local pain, lump, dysfunction and pathological fracture. Left hand middle finger joint pain, need to go to the hospital in time to avoid delaying the condition.