Knee swelling and pain are treated according to the cause, as follows: 1, gouty arthritis caused by knee swelling and pain, need to lower uric acid treatment; 2, mild degenerative osteoarthritis using physical therapy, drugs for conservative treatment, and appropriate functional exercise; 3, more serious osteoarthritis, need to use total knee or affected knee replacement surgery; 4, trauma caused by fractures, ligament damage, etc., the use of arthroscopy to restore the ligaments, the fracture reset treatment.