The incidence of colorectal cancer is very high, and emphasizing the
mortality rate of CRC, good screening and surveillance methods are essential for the
effective treatment of cancer. Early detection of the CRC is the key for its treatment. If
not detected early, it can cause serious symptoms like bleeding and difficulty in bowel
movement, which are considered serious symptoms. Different screening procedures are
available for the screening and detection of cancer, but the most commonly used
technique is colonoscopy, and another less common technique is flexible
sigmoidoscopy. People who have a screening colonoscopy have a cancer mortality rate
of 68 percent to 88 percent lower. Flexible sigmoidoscopy, although used in many
cases has certain limitations, and therefore, colonoscopy outplays it.
Keywords: Colonoscopy, Flexible sigmoidoscopy, Surveillance.
