This video helps you understand what is happening during this procedure. Often the patient is given medications to help them sleep. It is important to understand that the camera has already been inserted and gone through the entire procedure.
What you are seeing is as the camera moves back out of the colon. This is done slowly to evaluate the entire colon.
Colonoscopy may be done for several reasons:
1.) Preventative Medicine – as a screening tool
2.) Complaints of continued rectal bleeding
3.) Evaluate complaints of serious abdominal pain
4.) Screening for Colon Cancer