Whether a knee effusion will heal on its own depends on its cause. If the knee effusion is caused by synovitis of the knee joint, it may heal on its own with adequate rest; if it is caused by meniscal injury, it is usually caused by the lack of standardized treatment after the fall, and usually does not heal on its own, and is prone to recurrence, so patients are advised to treat it in a timely manner; if the effusion is caused by tuberculosis of the knee joint, it usually does not heal on its own, and can only recover after receiving regular and systematic anti-tuberculosis treatment; if it is caused by knee joint If it is caused by a knee injury, the injury is mild and there is no cruciate ligament rupture or lateral collateral ligament rupture, it can usually heal on its own after a period of rest; if it does not heal on its own after recuperation, active medical treatment is required. In conclusion, it is recommended that patients should go to the orthopedic department of a regular hospital for diagnosis and identification of the cause of knee effusion, and then choose the correct conservative treatment or surgical treatment method. In daily life, patients should avoid prolonged, excessive and strenuous exercise, perform physical exercise appropriately, and treat injuries promptly when they occur.