Colorectal cancer screening starts at 45 for many adults, but uptake lags

Average-risk adults should start colorectal cancer screening at 45. That change matters because screening can find precancerous polyps before they turn into cancer and can also catch cancer earlier, when treatment tends to work better.

Even with the lower starting age, many eligible adults still are not up to date, according to recent reporting and research on screening uptake.

Why screening matters

Colorectal cancer often develops from precancerous polyps in the colon or rectum. Screening can find those growths so they can be removed before they become cancer. It can also find cancer earlier, before symptoms become severe.

The main screening options

The Centers for Disease Control and Prevention says several tests are available. Some are done at home, while others are done in a clinic or hospital.

FIT or gFOBT: usually once a year
FIT-DNA stool test: usually every 3 years
Flexible sigmoidoscopy: usually every 5 years, or every 10 years with yearly FIT
Colonoscopy: usually every 10 years for people at average risk
CT colonography: usually every 5 years

The best test is the one a person is able to complete on schedule and follow through with, the CDC says.

What happens after an abnormal result

A key point is that a positive or abnormal stool test, flexible sigmoidoscopy, or CT colonography is not the end of screening. The CDC says a colonoscopy is needed to complete the process if something unusual is found.

That follow-up matters because a stool test can only suggest that bleeding or another problem may be present. It does not confirm the cause.

Who may need screening earlier

The age-45 recommendation is for average-risk adults. People may need to start earlier or be screened more often if they have inflammatory bowel disease, a personal or family history of colorectal cancer or polyps, or certain inherited syndromes such as Lynch syndrome or familial adenomatous polyposis, according to the CDC.

If someone is in a higher-risk group, the right test and timing can be different from the standard schedule.

Coverage can vary

Coverage often depends on the plan and the setting. The CDC says many colorectal cancer screening tests may be covered without a deductible or copay, and the KFF policy explainer notes that ACA preventive-service rules affect how these screenings are covered. Medicare also lists colorectal cancer screening among covered preventive services.

But plan details can differ, especially when a screening test turns into a diagnostic procedure, so readers should check their specific insurance benefits before scheduling a test.

Symptoms should not wait for a screening date

Screening is for people without symptoms. If someone has blood in the stool, rectal bleeding, a lasting change in bowel habits, unexplained weight loss, or ongoing abdominal pain or cramping, they should get medical evaluation rather than wait for the next routine screening date.

People with symptoms that are severe, sudden, or accompanied by fainting, heavy bleeding, or signs of dehydration should seek urgent care.

What readers can do next

If you are 45 or older, or think you may be at higher risk, ask a clinician which screening option fits your age, risk factors, and insurance coverage. For many people, the biggest step is simply getting the first test done and then keeping up with the schedule that goes with it.

Sources

Editorial note: Weence articles are researched from cited public-health, medical, regulatory, journal, and reputable news sources and may be drafted with AI assistance. They are checked for source support, clarity, and safety guardrails before publication.

This article is for general informational purposes only and is not medical advice. Research findings can be early or incomplete, and health guidance can change. Always talk with a qualified healthcare professional about personal symptoms, diagnosis, medications, vaccines, screenings, or treatment decisions. If you think you may have a medical emergency, call emergency services right away.