Onions for synovitis is false, lack of scientific evidence, but also timely medical treatment. Synovium is the tissue in the joint capsule, the form of thin connective tissue, and onions, whether edible or external use, for synovitis has no clear therapeutic effect, there is no authoritative literature or clinical cases can prove that the onion for synovitis there is a therapeutic effect. Therefore, after the occurrence of synovitis, do not believe in such rumors, we need to consult a doctor in a timely manner, MRI and other examinations, according to the doctor’s instructions for scientific treatment, such as injection of sodium vitrate in the joint cavity, the use of non-steroidal anti-inflammatory drugs such as ibuprofen, etc., the specific treatment plan and the choice of drugs based on the doctor’s instructions, do not self-medicating with prescription drugs.