This occurs because diverticula, small bulging pouches, develop fairly commonly within the digestive system’s inner lining, most often in the lower part of the colon (or large intestine). The development of diverticula are quite typical after the age of 40-years old. However, they seldom cause pain or health problems. Only if the pouches become inflamed or filled with infection, does diverticulitis pain occur. This is why many sufferers can live for years without knowledge that they have diverticulitis or any health problems.