There are a number of diseases that need to be alerted to the pain in the middle finger of the left hand, generally consider tendon sheath cyst or tenosynovitis, gout, rheumatoid arthritis, joint dislocation or fracture, trauma, neuropathy and other causes. If the symptoms continue to be unrelieved, you need to consult a doctor and take targeted treatment according to the cause under the guidance of the doctor. 1. Tenosynovial cyst or tenosynovitis: due to bad habits, it may appear as pain in the middle finger of the left hand and accompanied by dysfunction. 2. Gout: caused by the increase of uric acid, the more serious condition can form gout stone, resulting in finger pain and other manifestations. 3. Rheumatoid arthritis: it can be manifested as redness, swelling, pain and dysfunction of the joints, which can affect the daily work and life. 4. Joint dislocation or fracture: most of them are caused by trauma or violence, which may cause finger pain and activity dysfunction. 5. Trauma: playing basketball, soccer or other activities that cause finger injuries, it is recommended to go to the hospital in time for examination. Left hand middle finger pain need to go to the hospital, a clear diagnosis of the cause of the targeted treatment, can not just indiscriminate use of drugs.