Fluid accumulation in the knee is commonly caused by meniscus injury or synovitis, osteoarthritis and other factors, which need to be targeted treatment according to the cause. 1. Meniscus injury: when the fluid accumulation in the knee joint is small, when the meniscus injury is mild, conservative treatment can be taken, fixed with a knee brace. When the amount of fluid is large, the knee joint cavity can be punctured and extracted, and the fluid in the joint cavity can be extracted and the knee joint can be bandaged with pressure at the same time. 2. Knee synovitis: When the amount of fluid is relatively small, medication can be used, under the guidance of a doctor to use aspirin or acetaminophen tablets. When the amount of fluid in the knee joint is relatively large, it is necessary to perform a puncture of the joint cavity to extract the fluid, and then inject sodium vitrate and glucocorticoid drugs. 3. Osteoarthritis: Osteoarthritis caused by a variety of reasons may cause fluid in the knee joint, you can follow the doctor’s instructions to use celecoxib capsules and other drugs to treat. There may be other reasons for the knee effusion, you should go to the hospital in time, and actively under the guidance of the doctor to clarify the cause of the targeted treatment.