With aggressive treatment, shoulder effusion can be completely cured and recovered within 3-4 weeks. The fluid that occurs in the shoulder joint is divided into glenohumeral and subacromial bursal fluid. Most fluid that occurs in the glenohumeral joint is due to synovitis within the glenohumeral joint from various causes. The fluid that occurs in the subacromial joint often results from chronic inflammation of the subacromial bursa during frequent shoulder lifts. Both of these problems can be treated conservatively in the early stages, including oral non-steroidal anti-inflammatory drugs, limiting shoulder activities, giving local microwave physiotherapy, etc., all of which are conducive to the absorption and dissipation of the fluid, and most patients can get positive relief after regular conservative treatment. In a small number of patients, surgical treatment, such as arthroscopic cleaning of the subacromial bursa, or cleaning of the synovial membrane in the glenohumeral joint and repair of the internal lesion, can be used to quickly recover the fluid in the shoulder joint.