Top 10 unbelievable historical concurrencies. There are three common types of diverticular disease: diverticulosis, diverticulitis, and diverticular bleeding. The diseases are caused when pouches, called diverticula, form inside the large intestine.They can also form in the esophagus, small intestine, or stomach, but these are rarer. person has diverticulosis simply by having the pouches on his intestinal wall. Diverticulosis is the type of diverticular disease that usually does not have any symptoms. If a person does experience symptoms, they are usually mild, such as cramps.