What is diverticular bleeding?

Diverticular bleeding occurs when pouches (diverticula) that have developed in the wall of the large intestine (colon) bleed. If you have these pouches, you have a condition called diverticulosis. Diverticular bleeding causes a large amount of blood to appear in your stool.

Diverticular bleeding usually causes sudden, severe bleeding from the rectum. The blood may be dark red or bright red, and there may be clots. In most cases there is no abdominal (belly) pain.

Diverticular bleeding is diagnosed by ruling out other causes of the bleeding. Your doctor will do a medical history and physical exam, along with some tests. Colonoscopy—the inspection of the entire large intestine (colon) using a long, flexible, lighted viewing scope (colonoscope)—is thought to be one of the most useful tests for finding the source of bleeding in the lower intestines. An imaging test such as CT angiography may be done to find the location of persistent bleeding.

Bleeding from diverticula often will stop on its own. If it doesn't, treatment may be needed to stop it and to replace lost blood, and you may need to be hospitalized. Treatment may include intravenous fluids, blood transfusions, and injection of medicines.

Your doctor will give you the information you need to care for yourself at home. Follow any instructions about eating and activity. Take prescription medicines as instructed. Ask your doctor before taking any over-the-counter medicines. And go to any follow-up appointments.