ScienceWhat happens during a colonoscopy? To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoScience01/12/2017January 12, 2017A colonoscopy is one of the most effective check-ups available, but many people are scared of it. Genetic mutations that can lead to cancer can be identified with an endoscope during the examination, and removed directly. https://p.dw.com/p/2VbmKAdvertisement