The pain in the right middle finger may be caused by tendon injury, arthritis of the middle finger, infection of the middle finger and other factors, and the cause should be identified in time. 1. Tendon injury: mainly caused by trauma, such as cuts. After the finger tendon injury, the extension of the finger will be limited, and there will also be pain, most of which need to be treated with surgery. 2. Arthritis of the middle finger: Trauma causes damage to the cartilage in the joints of the fingers, leading to degeneration of the finger joints, which may be accompanied by swelling and pain. 3. Infection of the middle finger: The skin of the tip of the finger or the end of the finger is damaged, and due to improper care, the damaged area is infected, resulting in finger pain. In addition to the above, tenosynovitis, gout and other diseases may also cause finger pain. Do not judge on your own, it is recommended to go to the hospital as soon as possible to identify the cause of the disease and standardize the treatment under the guidance of the doctor.