Colonoscopies allow your doctor examine your large intestine or colon for abnormalities such as polyps and colon cancer by inserting a thin, flexible tube into your anus and advancing it into the rectum and colon.Download our PDF for more information on colonoscopies.To learn more about colonoscopies, what to expect, and how to prepare, please visit this link:https://www.asge.org/home/for-patients/patient-information/understanding-colonoscopy