The studies look at the causes, pathology, symptom, diagnosis, treatment of rheumatoid arthritis in the sight of east-western medicine. Following are the results : 1. Rheumatoid arthritis korean-medically belongs to symptom such as Bi(痺), Poung Bi(風痺), Tong Poung(痛風), Youk Jeol Poung(歷節風), Bak Hoe Poung(白虎風), Bak Hoe Youk Jeol Poung(白虎歷節風), etc. 2. The causes of Rheumatoid arthritis are endopathic and exopathic : endopathically it tis related to Chil Jeong(七情) and visceral imbalance, and exopathically it is related to Euk Eum (六淫) and environmental factors. 3. To figure out rheumatoid arthritis, we need to diagnose first the joint symptom and the general body condition, we need about 6 weeks to get the exact decision after the serologic test, the immune and inheritance test, the synovium test. 4. There are four kinds of treatments for rheumatoid arthritis : medicin, acupucture and moxibustion, suction cup and purging away the blood, physical therapy. Cheong Eol So Bi(淸熱消痺) can be used for the acute stage and Jang Bu Seong Shai(臟腑盛衰) is to be considered for the chronic stage. 5. Rheumatoid arthritis should be constantly treated to prevent the patient from the deformity of joint complication.