Rheumatoid arthritis of the leg joints is usually caused by group A streptococcal infections and can usually be treated with penicillin, nonsteroidal anti-inflammatory drugs, and glucocorticoids. Rheumatoid arthritis of the leg is often a delayed, nonsuppurative arthritis caused by group A streptococcal infection of the pharynx. Its pain is mostly wandering, multiple arthritis, usually disappear within two weeks and no residual deformity, but can be repeated. Clinically, penicillin can be used to eliminate streptococcal infections, non-steroidal anti-inflammatory drugs (such as Loxoprofen sodium, etc.) analgesic and anti-inflammatory, and if there are other complications (such as myocarditis, etc.), glucocorticosteroids can be taken, such as prednisone and other anti-inflammatory treatments. All of the above medications should be administered under the guidance of a medical professional. If the above situation occurs, please go to the rheumatology and immunology department of the regular hospital in time, and follow the doctor’s instructions to standardize the treatment.