Shoulder joint effusion is mainly caused by degeneration of the shoulder joint and synovitis, and the treatment is as follows: 1. Avoid strenuous sports: Avoid strenuous sports of the shoulder, such as playing ball, which can cause irritation of the synovial membrane and wear and tear of the cartilage, causing an increase in effusion. 2. Perform functional exercises: including abduction, supination, posterior extension, internal rotation and external rotation of the shoulder joint, and exercise the muscles around the shoulder joint, including the deltoid, scapula regional muscles, biceps, triceps, etc. The stronger the muscle strength and the stronger the muscle, the better the stability maintenance of the joint, which can make the fluid be absorbed and the amount of synovial fluid secretion will be reduced. 3. Joint aspiration: If there is more fluid in the joint cavity, you can try joint aspiration to reduce the fluid in the joint.