There often are no symptoms in the early stages of colorectal cancer, but testing for hidden blood in the stool can signal the need for further testing of the large intestine or colon.
Screening tests can find polyps, tiny growths that can become cancer.
Early removal of polyps can prevent colon cancer. Screening tests also can find colorectal cancers early, when symptoms may be few and cure rate is higher. Air contrast barium enema and colonoscopy are screening tests used to examine the colon for polyps and cancer. Colonoscopy - An examination in which the doctor looks at the inside of the entire colon and rectum through a slender, lighted, flexible tube. Polyps can be removed if they are found.