A Diverticulum is a small pouch with a narrow neck that protrudes from (sticks out from) the wall of the gut. Diverticula means more than one diverticulum. Some people are born with a diverticulum, most often from the small intestine. Most diverticula develop during later life and are more and more common with increasing age. the symptoms of diverticular disease are due to the muscle abnormality