Colonoscopy: During a colonoscopy, doctors insert a thin, flexible tube into the colon, or large intestine. This device contains a small camera that allows the doctor to view images on a video monitor. Biopsies are often taken as the doctor screens for polyps and other abnormalities.

Upper Endoscopy: Often referred to as an esophagogastroduodenoscopy or EGD, an upper endoscopy is a procedure in which a thin, flexible tube called an endoscope is used to examine the esophagus, stomach, and the first section of the small intestine (duodenum). Doctors might biopsy tissue or perform a cytology test to analyze any abnormalities.

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