Rheumatoid arthritis (RA) is a chronic, predominantly inflammatory synovitis systemic disease of unknown etiology. It is characterized by polyarticular, symmetric, aggressive joint inflammation of the small joints of the hands and feet, often accompanied by extra-articular organ involvement and positive serum rheumatoid factor, which can lead to joint deformity and loss of function. The severity of rheumatoid arthritis patients is generally judged based on the patient’s ability to take care of themselves (including dressing, bathing, eating, makeup and toileting), as well as their hobbies (including recreation and leisure) and occupational activities (such as study, work, household activities and other factors). Nowadays, the clinical application of the classification criteria of joint function determined by the American College of Rheumatology is common to classify the severity of joint lesions. Class I: Joints can move freely and perform their usual tasks without hindrance. Class II: Joints are moderately limited in movement, with pain and discomfort in one or more joints, but can manage daily life. Grade III: Significant restriction of joint movement, unable to perform work, and difficulty in managing daily life. Grade IV: Majority or complete loss of mobility, patient is bedridden or wheelchair dependent for a long time and cannot take care of himself/herself. The goal of treatment is to enable more patients with rheumatoid arthritis to maintain long-term Class I-II function and reduce the incidence of disability. Patients with rheumatoid arthritis must receive treatment as early as possible in order to receive good results.