Swelling and pain in the middle finger is considered to be the cause of trauma, tenosynovitis, finger arthritis, etc., which is analyzed as follows: 1. Trauma: if the patient’s middle finger is squeezed by the outside world or improperly exerted during exercise, sprains, etc., local soft tissue damage may occur. The symptoms of swelling and pain. 2. Tendonitis: mainly due to chronic strain, trauma and other reasons, such as knitting, typing, musical instrument playing and so on. When the joints move, the tendons and tendon sheaths rub against each other. Excessive friction will cause inflammation, and the patient will have symptoms of pain and swelling. 3. Finger arthritis: finger arthritis due to a combination of genetic, physical, age, trauma, inflammation and other factors, is a kind of articular cartilage degradation, osteomalacia as the main symptom of joint disease. Clinical symptoms of joint pain and swelling are often manifested. It is recommended that patients seek timely medical treatment, confirm the specific cause of the disease after a systematic examination by a doctor, and carry out targeted treatment to avoid other adverse situations.