We performed this study to assess pain in patients with knee osteoarthritis. Participants were 120 Patients(men 26 and women 94) with knee osteoarthritis. Pain evaluations were conducted using survey composed of 12 items by interview with oriental medicine doctor. Collected data were analyzed by IBM SPSS Statistics 19.0. Women were 3.8 times more than men(21.7% vs 78.3%). Approximately 80% of participants were overweight and obesity. Descending stair is most painful action for knee osteoarthritis patients. The average degree of knee pain was more than moderate. 5. People diagnosed as arthritis before had the much higher knee pain than never diagnosed before. This study showed female gender, overweight and obesity were associated with the risk of knee arthritis and participants complained knee pain more than moderate. It is hoped that our findings provide information that help the treatment of knee osteoarthritis.