• Diverticulitis

    (Acute Diverticulitis; Acute Colonic Diverticulitis)


    A pouch that forms in the wall of the large intestine is called a diverticulum. When this pouch becomes infected or swollen, it is called diverticulitis.
    Infected pouches along the colon.
    Copyright © Nucleus Medical Media, Inc.


    It is not clear why the pouches form. It may be due to a constant build up of pressure when food moves too slowly through the bowel. This pressure increases and pushes along the sidewalls of the bowel creating pouches. Digested food or stool can become trapped in one of the pouches. This leads to swelling and infection.

    Risk Factors

    This condition is more common in people who are older than 50 years of age.
    Factors that increase your chance of getting diverticulitis include:
    • Eating a low-fiber diet—fiber softens stools and makes them pass through the bowel more easily
    • Straining to pass a hard stool—causes increased pressure in the bowel
    • Previous episodes of diverticulitis
    • High-meat diet or high-protein diet
    • Defects in the colon wall
    • Chronic constipation
    • Smoking


    Symptoms can come on suddenly. They vary depending on the degree of the infection.
    Symptoms may include:
    • Abdominal pain
    • Tenderness—usually in the lower left part of the abdomen
    • Swollen and hard abdomen
    • Fever
    • Chills
    • Poor appetite
    • Nausea and vomiting
    • Diarrhea and/or constipation
    • Cramping
    • Rectal bleeding


    You will be asked about your symptoms and medical history. A physical and rectal exam will be done. Finding the disease early is important. The pouch can break, releasing stool into the abdomen. This is a medical emergency that requires surgery.
    Your bodily fluids and waste products may be tested. This can be done with:
    • Blood tests
    • Stool sample analysis
    Images may need to be taken of your bodily structures. This can be done with:
    After the inflammation subsides, other tests may be performed to examine the colon, including:


    The goals of treatment are to:
    • Resolve the infection and inflammation
    • Rest the bowel
    • Prevent complications
    Treatments include:


    Antibiotics and other medications are given to fight the infection. Pain medications and drugs are given to decrease the abdominal pain.
    You may also be given medication to help control vomiting.


    For mild swelling, you can drink clear liquids for the first 2-3 days. For a more severe case, you will be admitted to the hospital, where fluids are given by IV. Antibiotics will also be given to you through IV.

    Preventive Care

    Changes in your diet can help prevent future attacks.
    • Increase the amount of fiber you eat by eating more fruits, vegetables, and whole grains
    • Supplement your diet with a fiber product, as advised by your doctor
    • Avoid laxatives and enemas
    • Avoid opioid medications—they can slow down bowel movement and can cause constipation


    Surgery to remove the section of the bowel with pouches may be advised if:
    • You have had multiple attacks during a 2-year period
    • A pouch breaks and the contents spread into the abdominal cavity, which requires that the cavity be cleaned out
    Surgery is also used to treat complications of diverticulitis such as:
    • Abscess—occurs if the infected pouch fills with pus
    • Blocked bowel—scar tissue that forms and blocks movement of stool through the intestine
    • Fistula—occurs if the infection spreads and colon tissue attaches to another organ, such as the bladder, the uterus, or the vagina
    When surgery is done on an elective basis, the surgeon will remove the part of the bowel that is diseased and connect the normal parts of the bowel back together.
    When surgery is done on an emergency basis, the diseased part of the bowel will be removed. The healthy parts of the bowel will not be connected right away. Your bowel will need time to rest and heal. The upper part of the bowel will be attached to the abdominal wall. A stoma will allow waste to pass from the intestine to a bag outside of your body. If possible, the healthy bowel will be reconnected after 6-12 weeks.


    The following recommendations may help prevent diverticulitis by improving the movement of stool through the bowel and decreasing constipation:
    • Eat a balanced, high-fiber diet with plenty of fruits, vegetables, and whole grains.
    • Drink plenty of water each day.
    • Exercise regularly.


    American Society of Colon and Rectal Surgeons https://www.fascrs.org

    National Institute of Diabetes and Digestive and Kidney Diseases https//www.niddk.nih.gov


    Dietitians of Canada http://www.dietitians.ca

    Health Canada https://www.canada.ca


    Diverticular disease. American Society of Colon and Rectal Surgeons website. Available at: https://www.fascrs.org/patients/disease-condition/diverticular-disease. Updated October 2012. Accessed October 2, 2017.

    Diverticular disease. National Institute of Diabetes and Digestive and Kidney Diseases website. Available at: https://www.niddk.nih.gov/health-information/digestive-diseases/diverticulosis-diverticulitis. Accessed October 2, 2017.

    Diverticulitis. EBSCO DynaMed Plus website. Available at: http://www.dynamed.com/topics/dmp~AN~T113975/Diverticulitis. Updated December 21, 2015. Accessed October 2, 2017.

    2/9/2012 DynaMed Plus Systematic Literature Surveillance http://www.dynamed.com/topics/dmp~AN~T113975/Diverticulitis: Hjern F, Wolk A, Håkansson N. Smoking and the risk of diverticular disease in women. Br J Surg. 2011;98(7):997-1002.

    Revision Information

    • Reviewer: EBSCO Medical Review Board Daus Mahnke, MD
    • Update Date: 09/23/2014
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