Knee effusion can be seen in trauma, gout, etc., generally there is no way to eliminate themselves, need to consult a doctor in time, through rest, oral medication to reduce uric acid and other measures to alleviate. 1. Trauma: such as articular cartilage injury, meniscus tear, etc., resulting in synovial inflammation or acute hemorrhage in the joint capsule tissue, should be timely medical treatment, such as keeping the affected limbs braked, pay attention to rest, excessive fluid can be extracted fluid. 2. Gout: mainly manifested as redness, swelling, heat and pain and nodules, accompanied by activity limitation, the treatment is mainly to actively lower uric acid, such as colchicine, methylprednisolone, but also can use painkillers such as ibuprofen tablets. 3. Rheumatic system diseases: rheumatoid arthritis, such as rheumatoid arthritis, most commonly seen in type B hemolytic streptococcal infection, manifested as red, swollen and painful knee joints, the treatment is mainly to clear the streptococcal infection, such as benzylpenicillin, etc., but also the use of glucocorticosteroids, acetylsalicylic acid anti-rheumatic therapy. Knee effusion can be seen in other cases, it is recommended to consult a doctor in a timely manner to clarify the diagnosis and standardize the use of medication under the guidance of the doctor.