Joint effusion, first of all, looks at how it comes about. There are two types of joint effusion, first, non-infectious, which is called synovial edema, non-infectious inflammation. Second, it is infectious purulent inflammation. In the case of purulent inflammatory effusion, the pus has to be washed away by incision. Non-infectious effusion can be eliminated by activity. The activity is to circulate the blood in the knee joint, so that the fluid can be absorbed. If you use a needle to remove the fluid or squeeze it out by other means based on social uploading, the disease does not go away after squeezing it out, it forms again. Therefore, the elimination of synovial edema and joint effusion is to move around, and after moving around, the local blood circulation is good, and then it is clear. In Chinese medicine, it is said that when the blood circulation is clear, the fluid will not form again and the area will not swell.