Diverticula are small pockets, or pouches, that form in the wall of the intestine.

Diverticulosis refers to the presence of one or more diverticula in the intestine.

About 30 percent of Americans over 60 years old have diverticulosis.

A person with diverticulitis has inflammation of one or more diverticula, usually caused by infection. The swelling and irritation to the diverticulum can cause abdominal pain and bleeding from the intestine. Most people with diverticulitis respond well to treatment.