There are many reasons for the swelling and pain of the right middle finger joint at night, including excessive pulling, gout, osteophytes and so on, it is recommended to consult a doctor in time to clarify the cause of the disease. The most likely cause of swelling and pain in the right middle finger joint at night is joint degeneration and osteophytes caused by excessive pulling of the right middle finger, which will irritate the soft tissues around the middle finger when you move it, thus causing swelling and pain in the middle finger. In addition, the following diseases may also cause joint swelling, so it is recommended to consult a doctor in time and take appropriate treatment according to the cause of the disease. 1. Gout or rheumatic diseases: due to the increase of uric acid, a large amount of urate accumulation in the finger joints cause pain, finger pain will be accompanied by redness and swelling, finger joints are invaded by moisture can not be discharged from the body in time, thus causing joint swelling and pain. 2. Osteomalacia or osteoarthritis: Osteomalacia is characterized by significant swelling and pain in the joints, accompanied by joint stiffness, which is significantly relieved by activity. 3. Tendinitis or bacterial infection: Tendinitis of the finger joints leads to local congestion, edema and adhesion, septic arthritis caused by bacterial infection, traumatic arthritis caused by trauma, etc., all of which can cause significant swelling and pain in the fingers. 4. Finger joint injury or finger muscle contusion: the cause of finger joint swelling and pain.