In case of knee effusion, the following treatments are available: First, treatment for the primary disease. If the knee effusion is caused by tuberculosis, gout, or rheumatoid, anti-tuberculosis, anti-rheumatoid, and uric acid-lowering drugs should be administered. If it is caused by synovial lesions, such as synovitis of the knee joint with villi nodules, knee arthroscopic surgery should be performed to remove the synovial lesions in order to eliminate the fluid. Second, symptomatic treatment, if it is due to cold, osteoarthritis, or acute effusion of the knee caused by strain, you can carry out physical therapy of the knee, you can choose microwave physiotherapy or far-infrared physiotherapy, you can also take oral medication, you can take oral synovitis tablets, when the pain is serious, you can take oral pain medication, such as celecoxib, meloxicam. If there is a lot of fluid, which affects the movement of the joint and there is serious swelling, puncture of the joint cavity should be performed to extract more fluid and pressure bandaging, which can also accelerate the absorption of fluid and reduce the symptoms.