Diverticulosis sets the stage for inflammation and infection of the outpouching, that is for diverticulitis. (The "-itis" refers to inflammation.) It is potentially serious and can result in pain in the left lower abdomen, fever, nausea, vomiting, constipation and, paradoxically, diarrhea and frequent urination. Even graver consequences such as perforation of the colon and peritonitis are well known from diverticulitis.
The incidence of diverticulosis increases with age. Age causes a weakening of the walls of the colon and this weakening permits the formation of diverticula. By age 80, most people have diverticulosis.
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