Colon Cancer Screening Guidelines Changed: What Every Woman Over 40 Needs To Know Now
Find out when to get screened, how a colonoscopy compares to Cologuard and how to reduce your risk
Key Takeaways
- New screening guidelines now recommend most adults begin screening at age 45—not 50.
- A colonoscopy remains the most effective way to find and remove precancerous polyps.
- Knowing your family history, recognizing symptoms and getting screened helps prevent cancer.
Colon cancer used to feel like a worry for later—something to think about decades down the road. Not anymore. An estimated 158,850 Americans will be newly diagnosed with colon cancer this year, according to the American Cancer Society, and the disease is now the leading cause of cancer death among Americans under 50, up from the fifth leading cause in 2005. Here’s the good news: Colon cancer is one of the most preventable cancers when caught early. A little knowledge—and a willingness to schedule that screening you’ve been putting off—can truly save your life. Here’s everything you need to know about colon cancer screenings and how to stay healthy.
When to start colon cancer screening
Major health organizations, including the U.S. Preventive Services Task Force and the American Cancer Society, now recommend that average-risk adults begin screening for colorectal cancer at age 45. That’s a shift from the previous guideline of 50, updated in 2021 in response to rising cases in younger adults.
Some women need to start even earlier. Douglas K. Rex, MD, a clinical gastroenterologist with Indiana University Health, says those with a close relative diagnosed with colon cancer, a family history of colorectal cancer or an advanced colon polyp under age 60 should “begin colonoscopy at age 40, or 10 years younger than the age at which the relative was diagnosed, whichever occurs first.”
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Women with long-standing ulcerative colitis or Crohn’s colitis often need a colonoscopy every one to three years, depending on how extensive their disease has been.
Colon cancer symptoms you shouldn’t brush off
Colon cancer often develops silently, which is exactly why screening matters so much. But certain symptoms warrant a call to your doctor right away:
- Blood in your stool, whether dark or bright red
- Changes in bowel habits, including constipation, diarrhea or changes in stool shape
- Chronic abdominal pain, bloating or cramping
- Unexplained weight loss
- Unexplained fatigue or iron deficiency anemia
“Blood in the toilet bowl, in any amount, deserves attention,” Dr. Rex says. “Even blood only on the toilet paper should be discussed with a doctor.”
When to worry about colon polyps
If your doctor finds polyps during a colonoscopy, take a deep breath. Polyps are common, and most never cause problems. But because polyps are the precursors of nearly all colon cancers, removing them is the key to prevention. “People often don’t realize how routine polyps are,” Dr. Rex says. “We see them in nearly half of adults over 45, and most never produce symptoms.”
After removal, polyps are sent to a pathologist to determine whether they’re harmless or precancerous. The findings, plus the size and number of polyps, guide when you’ll need your next colon cancer screening. Women with one or two small precancerous polyps typically return in seven to 10 years. Larger polyps require closer follow-up—sometimes within six months to a year.
Colonoscopy vs. Cologuard: Which colon cancer screening is right for you?
When it comes to choosing a screening method, colonoscopy remains the gold standard—especially for those with a higher risk of colorectal cancer. “A colonoscopy is clearly better,” confirms Anish A. Sheth, MD, chief of gastroenterology at Penn Medicine, Princeton Medical Center. “It’s better at picking up polyps, and it has a much longer track record.”
Cologuard, the at-home stool DNA test, is over 90 percent effective at detecting colon cancer and very large polyps. But it’s only about 30 percent effective at finding smaller polyps that can lead to tumors. “If you’re in your 40s or 50s and have never had a colonoscopy before, [Cologuard] just isn’t good enough to buy you the 10-year [peace of mind] you would get from a colonoscopy,” Dr. Sheth says.
Cologuard may make sense for low-risk adults age 75 and older who’ve had clean colonoscopies, or for those who can’t undergo the procedure for medical or personal reasons. “We always say that the best screening test is the one a patient will actually do,” Dr. Sheth emphasizes.
5 ways to lower your colon cancer risk
Lifestyle changes—along with regular screenings—can meaningfully reduce your odds of developing colon cancer. Doctors recommend these strategies:
- Eat more fiber and fewer ultra-processed foods. Aim for at least 25 grams of fiber daily from fruits, vegetables and whole grains. Limit red meat to about 18 ounces per week and avoid processed meats.
- Move your body. Aim for 150 to 300 minutes of moderate activity weekly, combining cardio and strength training.
- Maintain a healthy weight. Excess body fat, especially around the waist, can drive hormonal and inflammatory changes that promote tumor growth.
- Know your family history. A close relative’s diagnosis could mean you need earlier or more frequent screenings for colon cancer.
- Limit alcohol and quit smoking. Both can damage DNA and raise cancer risk throughout the digestive tract.
“Colon cancer is one of the few cancers we can truly prevent,” says Amar Rewari, MD. “Genetics may set the blueprint, but your lifestyle writes the script.”
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