Rheumatoid arthritis is a clinical manifestation of rheumatic fever, which is a delayed sequelae that occurs after infection with streptococci. The most common symptoms include fever, arthritis, rheumatic heart disease, subcutaneous nodules, or marginal erythema. It mainly occurs in adolescents and is most commonly triggered by cold weather and damp environments. In cases showing joint symptoms, the first choice of medication is nonsteroidal anti-inflammatory drugs (NSAIDs). Additionally, it is crucial to actively treat the primary disease, which means eliminating the causative factor by eradicating the streptococcal infection. Eradication of the streptococcal infection involves the use of long-acting penicillin, and it is necessary to complete the treatment course of two weeks. Moreover, appropriate rest during the acute phase and avoiding exertion is needed. (Please use medication under the guidance of a professional physician and do not self-medicate.)