Diverticula of the colon are very common in developed countries. In most of those affected diverticulosis is an asymptomatic condition. Only 20% complain of recurrent symptoms. Symptomatic diverticulosis is common only after the age of 50. Dietary treatment combined with antispasmodics is generally sufficient. Diverticular disease is complicated by bleeding or by diverticulitis in 20% of symptomatic patients. Diverticulitis itself can be complicated by intra-abdominal abscess, fistulas, perforation with generalized peritonitis or bowel obstruction. Each clinical appearance is described and treatment is discussed.