Rheumatoid arthritis is caused by infection with group A beta-hemolytic streptococcus. Rheumatoid arthritis is a kind of joint inflammatory reaction disease, the pathogen of the disease is group A type B hemolytic streptococcus, essentially group A type B hemolytic streptococcus infection of the human body caused by the immune complex pathogenic, cellular immune damage and other abnormalities of the autoimmune system, the specific pathogenesis has not yet been fully clarified, and the common symptom is wandering joint pain, can be several joints at the same time. Rheumatoid arthritis treatment is based on drug therapy, such as penicillin and other anti-infective drugs, non-steroidal anti-inflammatory drugs, such as Loxoprofen sodium, after standardized and timely treatment of the patients generally do not appear joint deformity or joint movement disorders, and other sequelae, but the disease involves the heart, if not treated in a timely manner, 70% of the patients can occur cardiac valvular disease. Rheumatoid arthritis patients are advised to go to the rheumatology and immunology department of regular hospitals and other related departments for detailed consultation, and follow the doctor’s instructions for standardized treatment.