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Diverticulitis refers to the development of inflammation and infection in one or more diverticula. Diverticula are outpouchings or bulges which occur when the inner, lining layer of the large intestine (colon) bulges out (herniates) through the outer, muscular layer. The presence of diverticula indicates a condition called diverticulosis.


Diverticula tend to occur most frequently in the last segment of the large intestine, the sigmoid colon. They occur with decreasing frequency as an examination moves toward the beginning of the large intestine. The chance of developing diverticula increases with age, so that by the age of 50, about 2050% of all people will have some diverticula. By the age of 90, virtually everyone will have developed some diverticula. Most diverticula measure 330 mm in diameter. Larger diverticula, termed giant diverticula, are quite infrequent, but may measure as large as 15 cm in diameter.

The great majority of people with diverticulosis will remain symptom-free. Many diverticula are quite accidentally discovered during examinations for other conditions of the intestinal tract.

Causes & symptoms

Diverticula are believed to be caused by overly forceful contractions of the muscular wall of the large intestine. As areas of this wall spasm, they become weaker and weaker, allowing the inner lining to bulge through. The anatomically weakest areas of the intestinal wall occur next to the blood vessels that course through the wall, so diverticula commonly occur in these locations.

Diverticula are most common among the populations of the developed countries of the West (North America, Great Britain, and northern and western Europe). This is thought to be due these countries'diets , which tend to be quite low in fiber. A diet low in fiber results in the production of smaller volumes of stool. In order to move this smaller stool along the colon and out of the rectum, the colon must narrow itself significantly, and does so by contracting down forcefully. This causes an increase in pressure, which, over time, weakens the muscular wall of the intestine and allows diverticular pockets to develop.

Diverticulitis is believed to occur when a hardened piece of stool, undigested food, and bacteria (called a fecalith) becomes lodged in a diverticulum. This blockage interferes with the blood supply to the area, and infection sets in.

Diverticulitis is three times more likely to occur in the left side of the large intestine. Since most diverticula are located in the sigmoid colon (the final segment of the large intestine which empties into the rectum), most diverticulitis also takes place in the sigmoid. The elderly have the most serious complications from diverticulitis, although very severe infections can also occur in patients under the age of 50. Men are three times more likely than women to be stricken with diverticulitis.

An individual with diverticulitis will experience pain (especially in the lower left side of the abdomen) and fever . In response to the infection and the irritation of nearby tissues within the abdomen, the abdominal muscles may begin to spasm. About 25% of all patients with diverticulitis will have some rectal bleeding, although

this rarely becomes severe. Walled-off pockets of infection, called abscesses, may appear within the wall of the intestine, or even on the exterior surface of the intestine. When a diverticulum weakens sufficiently, and is filled to bulging with infected pus, a perforation in the intestinal wall may develop. When the infected contents of the intestine spill out into the abdomen, a severe infection called peritonitis may occur. Peritonitis is an infection and inflammation of the lining of the abdominal cavity, the peritoneum. Other complications of diverticulitis include the formation of abnormal connections, called fistulas, between two organs which normally do not connect (for example, the intestine and the bladder), and scarring outside of the intestine that squeezes off and obstructs a portion of the intestine.


When diverticula are suspected because a patient begins to have sudden rectal bleeding, the location of the bleeding can be studied by performing angiography. Angiography involves inserting a tiny tube (catheter) through an artery in the leg, and moving it up into one of the major arteries of the gastrointestinal system. A dye (contrast medium) which will show up on x-ray films, is injected into the catheter, and the area of bleeding is located by looking for an area where the contrast is leaking into the interior (lumen) of the intestine.

A procedure called colonoscopy provides another method for examining the colon and locating the site of bleeding. In colonoscopy, a small, flexible scope (colonoscope) is inserted through the rectum and into the intestine. A fiber-optic camera that projects to a nearby television screen is mounted in the colonoscope, which allows the physician to view the interior of the colon and locate the source of bleeding.

Diagnosis of diverticulitis is not difficult in patients with previously diagnosed diverticulosis. The presence of abdominal pain and fever in such an individual would make the suspicion of diverticulitis quite high. Examination of the abdomen will usually reveal tenderness to touch, with the patient's abdominal muscles contracting strongly to protect the tender area. During a rectal exam, a doctor may be able to feel an abnormal mass. Touching this mass may prove painful to the patient.

When a practitioner is suspicious of diverticulitis as the cause for the patient's symptoms, he or she will most likely avoid the types of tests usually used to diagnose gastrointestinal disorders. These include barium enema and colonoscopy (although colonoscopy may have been used earlier to diagnose the diverticulosis). The concern is that the increased pressure exerted on the intestine during these exams may increase the likelihood of intestinal perforation. After medical treatment for the diverticulitis, these examinations may be performed in order to learn the extent of the patient's disease.


Treatment for uncomplicated diverticulitis usually requires hospitalization, but some physicians will agree to try treatment at home for very mildly ill patients. These patients will be put on a liquid diet and receive oral antibiotics. Although relaxation, guided imagery , and acupuncture treatment may be helpful in alleviating pain symptoms, a course of antibiotics is necessary to treat the infection itself.

An infusion of herbs with anti-inflammatory and soothing properties, such as Mexican yam (Dioscorea villosa ), German chamomile (Matricaria recutita ), marsh mallow (Althaea officinalis ), and calamus (Acorus calamus, or sweet flag) may be helpful in treating the inflammation of diverticulitis. Ginger (Zingiber officinale ) can also be helpful in relieving gastrointestinal gas that may be symptomatic of the disorder.

Allopathic treatment

"Resting the bowel" is a mainstay of treatment, and involves keeping the patient from eating or sometimes even drinking anything by mouth. Therefore, a patient hospitalized for diverticulitis will need to receive fluids through a needle in the vein (intravenous or IV fluids). Antibiotics will also be administered through the IV. In cases of severe bleeding (hemorrhaging), blood transfusion may be necessary. Medications that encourage clotting may also be required.

While there are almost no situations when uncomplicated diverticulosis requires surgery, giant diverticula always require removal. This is due to the very high chance of infection and perforation of these diverticula. When giant diverticula are diagnosed, the usual treatment involves removing that portion of the intestine.

The various complications of diverticulitis need to be treated aggressively, because the death rate from problems such as perforation and peritonitis is quite high. Abscesses can be drained of their infected contents by inserting a needle through the skin of the abdomen and into the abscess . When this is unsuccessful, open abdominal surgery will be required to remove the piece of the intestine containing the abscess. Fistulas require surgical repair, including the removal of the length of intestine containing the origin of the fistula, followed by immediate reconnection of the two free ends of intestine. Peritonitis requires open surgery. The entire abdominal cavity is cleaned by being irrigated (washed) with a warmed sterile saltwater solution, and the damaged piece of intestine is removed. Obstructions require immediate surgery to prevent perforation. Massive, uncontrollable bleeding, while rare, may require removal of part or all of the large intestine.

During any of these types of operations, the surgeon must make an important decision regarding the quantity of intestine that must be removed. When the amount of intestine removed is great, it may be necessary to perform a colostomy. A colostomy involves pulling the end of the remaining intestine through the abdominal wall, to the outside. This bit of intestine is then fashioned so that a bag can be fit over it. The patient's waste (feces) collect in the bag, because the intestine no longer connects with the rectum. This colostomy may be temporary, in which case another operation will be required to reconnect the intestine, after some months of substantial healing has occurred. Other times, the colostomy will need to be permanent, and the patient will have to adjust to living permanently with the colostomy bag. Most people with colostomies are able to go on with a very active life.

Occasionally, a patient will have such severe diverticular disease that a surgeon recommends planning ahead, and schedules removal of a portion of the colon. This is done to avoid the high risk of surgery performed after a complication has set in. Certain developments will identify those patients who are at very high risk of experiencing dangerous complications, such as those with a history of diverticulitis.

Surgery for chronic (recurring) diverticulitis remains controversial. Some surgeons say that surgery prevents recurrence of problems, while others say it does not. In 2002, a report to family physicians said that elective surgery in cases of severe diverticulitis produces good outcomes and low rates of recurrence. However, patients should be cautioned about possible postoperative complications such as bleeding, abscess, and bowel obstruction. The risk of depends on functional bowel symptoms before surgery.

Expected results

The prognosis for people with diverticula is excellent, with only 20% of such patients ever seeking any medical help for their condition.

While diverticulitis can be a difficult and painful disease, it is usually quite treatable. Prognosis is worse for individuals who have other medical problems, particularly those requiring the use of steroid medications, which increase the chances of developing a serious infection. Prognosis is also worse in the elderly.


While there is no absolutely certain way to prevent the development of diverticula, it is believed that high-fiber diets may help. Foods that are recommended for their high fiber content include whole grain breads and cereals, and all types of fruits and vegetables. Most experts suggest that individuals take in 2035 grams of fiber daily. If this is not possible to achieve through diet, an individual may supplement with fiber products that are mixed into juice or water.



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Cerda, James J., et al. "Diverticulitis: Current Management Strategies." Patient Care 31, no. 12 (July 15, 1997): 170+.

Cunningham, Mark A., et al. "Medical Versus Surgical Management of Diverticulitis in Patients Under Age 40." American Journal of Surgery 174, no. 6 (December 1997): 733+.

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"Keeping Diverticulosis Silent." Berkeley Wellness Letter 12, no. 4 (January 1996): 6+.

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National Digestive Diseases Information Clearinghouse. 2 Information Way, Bethesda, MD 20892-3570. (301) 654-3810.

Paula Ford-Martin

Teresa G. Odle

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diverticulitis (dy-ver-tik-yoo-ly-tis) n. inflammation of a diverticulum, most commonly of one or more colonic diverticula. This type of diverticulitis is caused by infection and causes lower abdominal pain with diarrhoea or constipation. A Meckel's diverticulum may sometimes become inflamed due to infection, causing symptoms similar to appendicitis. Compare diverticular disease.

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diverticulitis, diverticulosis See diverticular disease.

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