Diverticular disease is a disease of the large intestine characterized by tiny outpouchings in the wall of the colon called diverticula, which can become inflamed (red, swollen) and infected. This colonic disease affects approximately half of the population over the age of 60 in advanced western countries. It was thought to be a disease of the elderly, but recent reports indicate an increased prevalence in persons younger than 60 years of age. The disease is divided into diverticulosis and diverticulitis.