MSD Manual

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What Is Diverticulosis?
What Is Diverticulosis?

    In diverticulosis, many balloon-like sacs (diverticula) develop in the large intestine, most commonly in the last part of it (sigmoid colon). Most diverticula vary in diameter from 1/10 inch to more than 1 inch (about ¼ centimeter to more than 2½ centimeters). For unclear reasons, some diverticula become very large—up to 6 inches (about 15 centimeters) in diameter.