Many patients ask how synovitis is treated and why it is most likely to recur. Many doctors often tell their patients that “you have synovitis”, leading them to think that synovitis is a disease. In fact, this is a serious misinformation! Synovitis is not a separate disease, but is a clinical condition caused by a disease. It manifests as joint effusion, a common manifestation that occurs in all types of arthritis. Synovium is the innermost layer of the joint cavity, a membranous tissue that protects the joint and produces joint fluid as a joint lubricant. It is important to note that the synovial membrane is the tissue that produces the joint fluid, and it is the synovial tissue that is responsible for the absorption of the joint fluid. The synovial tissue produces joint fluid at all times and absorbs it at all times. The human joint maintains a dynamic balance between this constant production and absorption. When joint fluid occurs, the synovial membrane of the joint is irritated due to various joint diseases, and this results in a “synovial reaction” in which the synovial membrane produces large amounts of joint fluid. This is actually a compensatory self-protection mechanism in humans. The increased joint fluid fills the joint cavity, which increases the “lubrication” of the joint; it also increases the joint space, reducing friction. However, the patient’s joints may become swollen, painful and difficult to move. This is called “synovitis,” and it is a common manifestation of all kinds of arthritis attacks. Synovitis is most often seen in the knee joint. Because the knee is the largest weight-bearing joint in the body, symptoms can worsen when the patient is exercising, especially when the patient is walking down stairs or squatting. There are several common treatments for synovitis: medications, physical therapy, interventional therapy and surgery. Commonly used drugs include non-steroidal drugs (e.g. Fotarine), and Chinese herbal medicines (e.g. Synovitis Punch) to activate blood circulation and resolve blood stasis. The physical therapy team is very effective in treating synovitis. There are different methods of physical therapy, but they all aim to improve blood circulation in the joint. After conservative treatment is not good, you can receive arthroscopy and surgery. In addition, it is also important to protect your knee joint, you should pay attention to the cold and avoid cold wind blowing directly on the joint. Do not put the knee joint in a state of wear and tear for long periods of time, such as long descents and descending stairs (descending stairs is more damaging to the knee joint than going upstairs), long squats and semi-flexion are also more damaging to the knee joint and should be minimized. The most important thing to note is that, as mentioned earlier, “synovitis” is only one manifestation of arthritis, so it is important to understand the cause of synovitis (i.e., what the primary cause is) in order to treat it. Because the type, cause, duration and characteristics of each type of arthritis are different, the treatment of each type of arthritis is also different. Therefore, it is important to find the cause of synovitis while treating synovitis, and only when the cause is found can effective targeted treatment be performed.