What Should Seniors Know About Colorectal Cancer Screening?
Colorectal cancer is the third most common cancer and second leading cause of cancer death, yet it is highly preventable and treatable when found early. Screening detects cancer at early, curable stages and can find precancerous polyps before they become cancer. Understanding screening options helps seniors make informed decisions about this important preventive care.
Why Screening Matters
Colorectal cancer often develops slowly from precancerous polyps over 10 to 15 years. Screening can find and remove polyps before they become cancer, actually preventing cancer rather than just detecting it early. When cancer does develop, early-stage detection dramatically improves survival.
Colorectal cancer often causes no symptoms until advanced. By the time symptoms like bleeding, pain, or changes in bowel habits appear, cancer may have spread. Screening finds problems before symptoms develop, when treatment is most effective.
Screening Options
Colonoscopy examines the entire colon using a flexible camera. It finds polyps and cancers with high accuracy and allows polyp removal during the same procedure. Colonoscopy is recommended every 10 years for average-risk individuals. It requires bowel preparation and sedation.
Stool-based tests detect blood or cancer DNA in stool samples collected at home. These non-invasive tests include fecal immunochemical test done yearly and stool DNA test done every three years. Positive results require follow-up colonoscopy.
CT colonography, also called virtual colonoscopy, uses CT scanning to image the colon. It requires bowel preparation but no sedation. Abnormal findings require follow-up colonoscopy. This option is recommended every five years.
Flexible sigmoidoscopy examines only the lower colon and is less commonly used now. It is recommended every five years or every 10 years when combined with annual stool testing.
Who Should Be Screened
Average-risk screening typically begins at age 45 and continues through age 75. Between 75 and 85, screening decisions should be individualized based on overall health, life expectancy, and prior screening history. Screening is generally not recommended after 85.
Higher-risk individuals, including those with family history of colorectal cancer or polyps, personal history of inflammatory bowel disease, or certain genetic syndromes, need earlier and more frequent screening. Discuss your risk factors with healthcare providers.
Choosing a Screening Method
The best screening test is one that gets done. Different tests have different advantages. Colonoscopy is most comprehensive but requires preparation and sedation. Stool tests are convenient but need annual repetition and may miss some polyps.
Patient preference matters in choosing screening method. Some prefer the thoroughness of colonoscopy despite its demands. Others prefer home-based stool tests despite limitations. Either approach provides protection compared to no screening.
If Screening Finds Problems
Polyps found during colonoscopy are usually removed during the procedure. Most polyps are not cancer, but removal prevents them from becoming cancer. Follow-up colonoscopy timing depends on polyp characteristics.
If cancer is found, staging determines extent and guides treatment. Early-stage cancers are often curable with surgery alone. More advanced cancers may need chemotherapy or radiation. Early detection through screening dramatically improves outcomes.
Getting Screening
All Seniors Foundation encourages colorectal cancer screening for eligible seniors. Screening prevents cancer and saves lives. Contact us if you need help understanding screening options or accessing screening services.
