Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A colonoscopy is a medical procedure that examines the large intestine, namely colon and rectum, using a thin, flexible tube with a small camera, called colonoscope. The procedure is designed to evaluate gastrointestinal problems, as well as to help in finding cancer or precancerous growths. Although during gastrointestinal investigations sedation is recommended to avoid discomfort, according to new research, the increasing administration of unnecessary sedatives throughout colonoscopy procedure, could have a negative effect on the healthcare system. To find out more about colonoscopy, its efficacy and risks - read this book.