Diverticulitis
A digestive disease, most commonly found in the large intestine, Diverticulitis develops from diverticulosis, which is where pouches (diverticula) form on on the outside of the colon. If one of these pouches becomes inflamed then its Diverticulitis.
Image of a Diverticula - click to view
Note: The picture is not very pleasant hence you must click the link to view it.
For more detailed medically based information on Diverticulitis, including information on Symptoms, Diagnosis, Treatment, Complications, Epidemiology, please visit this page:
Wikipedia