The treatment of fluid in the shoulder joint depends on the specific cause of the fluid and the symptoms. If the fluid in the shoulder joint is caused by an injury, treatment is usually based on the exact extent of the injury. If the injury is a simple strain, forearm suspension is usually performed and the shoulder joint is immobilized to keep the muscles and surrounding soft tissues fully relaxed. If there is a significant tear, minimally invasive arthroscopic surgery of the shoulder joint is performed, suturing of the torn location and shoulder immobilization is performed. If the shoulder joint effusion is caused by local inflammatory exudate, you should usually take oral anti-inflammatory and pain relieving drugs such as Nimesulide and Ibuprofen to reduce the local inflammation, apply warm compresses with a warm water bag to increase local blood circulation and promote inflammation metabolism, and pay attention to keeping warm and not getting cold. You can inject compound betamethasone injection into the joint to control the joint inflammation. After the inflammation is under control, you can inject sodium glacial injection to lubricate the shoulder joint. If the amount of joint effusion is large, you can first perform an empty needle aspiration to remove the fluid inside and reduce the pressure on the joint, then apply a local pressure bandage, and then perform symptomatic treatment.