The author reports 2cases of diverticulosis involving the ascending colon and cecum : one, 55 year old, 85kg Korean male admitted to Paik hospital because of abdominal pain, constipation and tenderness in the right lower abdomen. The other, 48 year old, 78kg male visited to our hospital for the routine examination. According to late European and American statistics, the colonic diverticulosis was discovered in late middle life about 20%, however, the incidence of colonic diverticulosis is rare in Korea. This paper presents a brief review of literature on the etiology, incidence and symptom.