SOURCES: National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK): "Constipation," "What I Need to Know About Constipation." American College of Gastroenterology, "Common GI Problems: Volume 2: Constipation." WebMD Medical Reference in collaboration with The Cleveland Clinic: "Constipation," "Symptoms of Colorectal Cancer." WebMD Medical Reference: "Irritable Bowel Syndrome and Laxative Safety." Medscape: "Chronic Constipation -- Defining the Problem and Clinical Impact." Müller-Lissner, S. American Journal of Gastroenterology, January 2005; vol 100: pp 232-242. Up To Date: "Constipation in Adults."

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