Surgery for diverticulitis involves removing the diseased part of the colon. You may decide to have surgery for diverticulitis if you have:

• A partially blocked colon or a narrow spot in the colon (stricture).
• Repeated attacks of diverticulitis. Surgery to remove the diseased part of the colon often is recommended if you have two or more severe attacks.
• A high risk of complications (such as people younger than age 40 who have had an attack of diverticulitis).
• Repeated problems with bleeding from the colon.
• An abnormal opening (fistula) that has formed between the colon and an adjacent organ, most commonly the bladder, uterus, or vagina.
• Signs of possible cancer that cannot be confirmed with other tests.

Surgery for diverticulitis, in which the infected part of the colon is removed, may be required if you have complications, including:

• An infected pouch (diverticulum) that has ruptured into the abdominal cavity, especially if a pocket of infection (abscess) has formed. In some cases, an abscess can be drained without surgery. (See the Other Treatment section of this topic.)
• An infection that has spread into the abdominal cavity (peritonitis).
• A blocked colon (bowel obstruction).
• Infection that has spread through the blood to other parts of the body (sepsis).
• Severe bleeding that does not stop with treatment given through an angiogram or colonoscopy.

Overall, less than 8% of people with diverticulitis (1 in 12) need surgery.⁴

Surgical treatment involves removing the diseased part of the large intestine (partial colectomy) and reconnecting the remaining parts. Depending on the severity and nature of the symptoms, more than one surgery may be needed to correct the problem. When multiple surgeries are needed, the person usually has a colostomy during the time between surgeries. A colostomy is a surgical procedure in which the upper part of the intestine is sewn to an opening made in the skin of the abdomen. Stool passes out of the body at this opening and into a disposable bag. The colostomy is usually removed and the intestine reconnected at a later time.

Surgery Choices

Surgical treatment of diverticulitis, called partial colectomy, involves the removal of the diseased part of the large intestine.

What To Think About

People who have mild, brief attacks and who are willing to try long-term dietary changes may be able to avoid surgery. See the Prevention section of this topic for more information on diet.

If you have multiple attacks of diverticulitis, surgery may be appropriate.

The survival rate is 99% for nonurgent (elective) surgery for diverticulitis.⁵ An emergency surgery has more risks.