Diverticulitis (Diverticulosis): Diverticulitis is an inflammation of the diverticula in the colon. This conditions is referred to as diverticulosis. Causes of Diverticulosis (diverticulitis) include aging, a low fiber diet, frequent constipation and bowel straining. Symptoms of diverticulitis include abdominal pain, bloating, constipation, and cramping. Treatment generally requires a high fiber diet and frequent liquid hydration to prevent constipation. If complications occur with the disease or it becomes severe, surgery may be necessary.