Colonoscopy is a half day procedure at a local public or private hospital. It is performed under a light general anaesthetic given by a specialist anaesthetist. There is usually no experience of the test and it is very low risk. Colonoscopy is used to investigate abdominal symptoms such as pain, constipation or diarrhoea, and bleeding from the bowel. It is also used as surveillance for bowel cancer and the precursor bowel polyps in patients at risk; such as in those with a family history of bowel cancer or people over 50 years old.