Whether shoulder joint effusion can be self-absorbed or not needs to be judged according to the specific situation. If the joint effusion is small, it can generally be self-absorbed; if the joint effusion is large and the inflammation is not effectively controlled, it cannot be self-absorbed in general, and treatment is needed. Shoulder joint effusion is mostly due to inflammation around the shoulder joint, trauma and other causes of inflammation reaction, inflammation stimulation, normal shoulder joint will also have a small amount of fluid, play a role in lubricating the joint. If the fluid in the shoulder joint is small, it can be absorbed by itself after proper rest and reduced activities. If there is more fluid in the shoulder joint and the inflammation is not controlled, it is usually difficult to be absorbed on its own and requires treatment with oral non-steroidal anti-inflammatory drugs, such as diclofenac sodium for inflammation and pain relief. After checking and finding the shoulder joint effusion, it is recommended to combine with your own situation and choose the appropriate treatment plan under the guidance of your doctor.