Swelling and pain in the middle finger of the right hand may be caused by gouty arthritis, tenosynovitis of the middle finger, carpal tunnel syndrome and other factors. 1. Gouty arthritis: when the concentration of uric acid in the blood is too high, it will lead to the precipitation of a large number of uric acid crystals and deposition in the joints with weak skin and the soft tissues around the joints, which will lead to inflammatory reaction in the joints and cause swelling and pain. When gout crystals are deposited in the middle finger interphalangeal joint where the skin is weak, it will cause swelling and pain in the middle finger. 2. Tenosynovitis of the middle finger: When the tendon sheath of the middle finger rubs against the tendon repeatedly, it will lead to the damage of the tendon sheath and the surrounding soft tissues, resulting in inflammatory reactions such as edema and hyperplasia, which will lead to the symptoms of swelling and pain in the middle finger of the right hand. 3. Carpal tunnel syndrome: when the wrist is engaged in long-term labor activities, it is easy to cause the median nerve of the wrist to be squeezed, which will lead to sensory impairment and functional abnormality in the innervated area, thus causing swelling and pain in the right middle finger. Swelling and pain in the middle finger of the right hand should be taken seriously, and may also be caused by trauma. If the swelling and pain are not relieved, you need to go to the orthopedic department of the hospital for examination and standardized treatment under the guidance of the doctor.