The bending pain of the left middle finger may be caused by fracture, tenosynovitis, osteoarthritis, etc., which requires general treatment, medication and surgery. 1. For trauma, the middle finger of the left hand should be splinted, its activities should be limited, so that it can rest fully; oral ibuprofen and other analgesics can be prescribed; if conservative treatment is ineffective or comminuted fracture, surgical treatment is possible. 2. For tenosynovitis, oral ibuprofen, prednisone and other drugs can be prescribed to control inflammation, which can help relieve symptoms; if conservative treatment is ineffective, tendon sheath decompression is feasible. 3. For osteoarthritis, oral ibuprofen and other non-steroidal anti-inflammatory drugs, intra-articular injection of procaine and other local anesthetics can be prescribed; if the above treatments are not effective, arthrocentesis and osteotomy can be performed according to the specific conditions. It is recommended to go to the regular hospital in time for the bending pain of the left middle finger, to clarify the cause of the disease, and to carry out standardized treatment under the guidance of the doctor.