what is a diverticulitis
1 Diverticulosis is a condition that describes small pouches in the wall of the digestive tract that occur when the inner layer of the digestive tract bulges through weak spots in the outer layer.2  When these diverticula become inflamed, that is called diverticulitis. One of the main causes of diverticulosis is a diet low in fiber. 2  Many people with diverticulosis have no symptoms. 3  When symptoms do occur they can include. 4  pain in the abdomen, 5  bloating, 6  constipation (less often, diarrhea), and. 7  cramping. 8  Diverticulitis is more serious and symptoms can include.