Many patients who are first diagnosed with rheumatoid arthritis cannot help but ask “why do I have rheumatoid”. In this regard, people consider different directions, such as: “Is it because the living environment is cold and cold?” ”There are old people in my family who have the old problem of joint pain, did they inherit it from me?” ”Could it be that I’ve been exposed to rheumatoid patients in my life and work and I’ve been infected?” ”……” Here, we have a brief introduction to the causes of rheumatoid arthritis: rheumatoid arthritis, a chronic systemic inflammatory disease whose cause is still unknown, is now commonly attributed to rheumatoid arthritis as an autoimmune disease, which may be related to genetics, pathogenic infections, endocrine, nutritional metabolism, living environment, psychological factors and other aspects. First, rheumatoid arthritis is not an infectious disease. The rheumatoid arthritis patients and other people living together will not occur infectious phenomenon, although there are studies that its onset is related to infection, but the infection is not the primary causative factor of its onset, there is no clear pathogenic bacteria causing the disease. There are three conditions for the spread of infectious diseases: 1) a pathogenic germ with infectious ability; 2) a route of transmission; and 3) you are a susceptible person. Rheumatoid arthritis does not meet the conditions for transmission, so it is not contagious. Second, rheumatoid arthritis is not a genetic disease. Mentioned above, rheumatoid arthritis and genetics have a certain relationship, because there have been family twin disease survey results show that in the family of rheumatoid patients, the incidence of rheumatoid rheumatism than healthy people families 2 to 10 times higher; one of the twins suffering from rheumatoid arthritis, the chances of the other disease is also large. Molecular biology studies have also shown that people carrying certain subtypes of human leukocyte antigens (HLA), such as DR4 or DR1, are susceptible to rheumatoid arthritis. However, the etiology of rheumatoid arthritis is multifaceted, and genetics is not the only factor; patients with these susceptibility genes do not necessarily have the disease, and those without susceptibility genes have also been diagnosed with rheumatoid arthritis. The rheumatoid arthritis is a genetic susceptibility, but not a genetic disease, the onset of which is the result of a combination of factors. The rheumatoid arthritis is not “rheumatic old cold leg”. The “rheumatism” and the “rheumatism” of western medicine “rheumatoid arthritis” are different concepts, so moisture and cold will not necessarily lead to rheumatoid arthritis, but the cold Many rheumatoid arthritis patients are also prone to disease activity and joint pain when the weather changes, so it is essential to pay attention to the living environment and do a good job of keeping warm and protected. Finally, endocrine, nutritional metabolism, psychological stress, and poor lifestyle habits may all play a role in the onset of rheumatoid arthritis, and there are even many patients who have no clear cause for the onset of the disease.