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A colonoscopy is a diagnostic procedure where the doctor uses an endoscope, which is a long flexible tube with a light and camera attached to one end, to examine the inside of the colon (large intestine). It is used to diagnose the cause of gastrointestinal conditions like rectal bleeding, inflammatory bowel disease, intestinal bleeding, colorectal cancer, and colorectal polyps. It also helps to collect biopsy or removal of suspected colorectal cancer. Colonoscopy is also used to remove polyps. The risks and complications of a colonoscopy are an allergic reaction to the sedative, bleeding from the biopsy site, and perforation of the rectum or colon wall.