Bowel cancer is the fourth most common cancer in the UK. If it’s detected at an early stage, before symptoms appear, it’s easier to treat and there’s a better chance of surviving it. For further information please visit
http://www.nhs.uk/conditions/bowel-cancer-screening/Pages/Introduction.aspx
This below link gives information about how a colonoscopy is carried out, and explains the benefits and risks of having the investigation.