Diverticulitis occurs when diverticula tear, resulting in inflammation or infection or both.
Doctors aren't sure what causes diverticula in the colon or diverticulosis. 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.
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