Diverticulitis happens when pouches (diverticula ) form in the wall of the colon and then get inflamed or infected.

Diverticulosis is a condition, rather than a disease. The majority of adults have some degree of diverticulosis. It affects the large intestine, or colon. A normal colon is strong and relatively smooth. A colon affected by diverticulosis has weak spots in the walls. These defects allow the development of balloon-like sacs or outpouches - much like a bubble forming on a worn inner tube.

Doctors aren't sure what causes diverticulitis. But they think that a low-fiber diet may play a role. Without fiber to add bulk to the stool, the colon has to work harder than normal to push the stool forward. The pressure from this may cause pouches to form in weak spots along the colon. Diverticulitis happens when bacteria get trapped in the pouches. This can lead to inflammation or infection.

Your doctor will ask about your symptoms and will examine you. He or she may do tests to see if you have an infection or to make sure that you don't have other problems. Tests may include:

You may be able to prevent diverticulitis if you drink plenty of water, get regular exercise, and eat a high-fiber diet. A high-fiber diet includes whole grains, fresh fruits, and vegetables.

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Diverticulitis develops when bacteria become trapped in pouches (diverticula ) that have formed along the wall of the large intestine, leading to an infection. The bacteria grow and cause inflammation and pressure that may lead to a small perforation or tear in the wall of the intestine. Peritonitis, an infection of the lining of the abdominal wall, may develop if infection spills into the abdominal (peritoneal) cavity.

Click here for the National Library of Medicine Medical Encyclopedia. Select the D – Di alphabetical index and scroll to the bottom of the list. Click on diverticulitis and learn more about diverticulitis than you ever really wanted to know.