Diverticulitis occurs when a person has one or more pouches, or sacs, in the wall of your colon that are inflamed. The signs and symptoms of diverticulitis include Pain, which may be constant and persist for several days, Nausea and vomiting, Fever, Abdominal tenderness &/or bloating, Constipation or, less commonly, diarrhea, Indigestion, Irregular bowel movement