Swelling of the left hand to make a fist is not a common cause of finger osteoarthritis or hand soft tissue injury. 1. Osteoarthritis of the fingers: for a joint cartilage degeneration, osteophytic disease, patients will have hyperplastic nodules, joint pain, activity disorders, etc. leading to the hand joints at the interphalangeal joints will be swollen, inflammatory reaction, so the hand in the fist will be swollen, pain and other symptoms. 2. Hand soft tissue injury: when the patient’s hand in excessive force or hand trauma, resulting in mild synovial membrane hyperplasia, interphalangeal joints edema, inflammatory reaction, the patient in the fist when the symptoms of the grip is not tight. At this time, patients can use hot compresses on the hand to promote blood circulation between the fingers and reduce the inflammatory reaction, which will help the recovery of the interphalangeal joints. If the patient through the above methods of treatment, finger swelling does not reduce to the hospital in time to identify the cause, the doctor will be based on the patient’s clinical symptoms and causes, to take different treatment methods.