Stiffness of the right middle finger and difficulty in bending may be caused by scar contracture after trauma, or it may be caused by stenosing tenosynovitis, osteoarthritis, rheumatoid arthritis and other diseases, which need functional exercise, medication and surgery. 1. Scar contracture: Due to the adhesion of soft tissues around the right middle finger after injury and the contracture of scar tissues of the skin after surgery, it will lead to the stiffness of the right middle finger which can not be bent, and can be given hot compresses, massages and other physical therapy methods to loosen the contracture and adhesion of the muscles, and the serious cases may need surgical treatment. 2. Stenosing tenosynovitis: it is a sterile inflammation of the tendon sheath tissue around the flexor tendon of the middle finger, which can cause limitation of the flexion and extension of the middle finger, accompanied by pain. Oral non-steroidal anti-inflammatory analgesic drugs such as ibuprofen and acetaminophen can be taken, and surgery is needed for serious cases. 3. Osteoarthritis: It can cause narrowing of the joint space of the right middle finger, causing local pain and limitation of finger joint activities. Non-steroidal drugs such as ibuprofen, piroxicam, diclofenac, etc. can be used to play an anti-inflammatory and analgesic role. 4. Rheumatoid arthritis: invasion of small joint soft tissue can appear pain, morning stiffness phenomenon, that is, get up after the fingers hard. Chemical synthetic drugs such as methotrexate should be chosen to control the progression of the disease, and anti-inflammatory and immunosuppressive effects of glucocorticoid drugs such as trimethoprim should be used. There may be other reasons for the stiffness of the middle finger of the right hand and the difficulty in bending it, so it is recommended to go to the hospital in time to clarify the cause of the disease, and under the guidance of the doctor for treatment. All of the above medications should be used under medical supervision.