Colorectal cancer screening recommendations have shifted significantly, with the recommended starting age moving from 50 to 45 for people at average risk. This change reflects a troubling trend: colorectal cancer rates in younger Americans have increased substantially in recent years. Understanding the new guidelines and what they mean for your health is essential, especially since colonoscopy remains one of the most effective ways to prevent cancer before it starts.

Why Did the Screening Age Drop to 45?

The decision to lower the screening age wasn't arbitrary. Medical professionals have observed a marked increase in colorectal cancer diagnoses among younger adults, prompting a reassessment of when screening should begin. "The rate of colorectal cancer in younger Americans is much more prominent now," explained Dr. Barry Hammaker, a general surgeon. "That's essentially why the screening age moved from 50 to 45". This shift reflects current evidence and aims to catch cancer earlier, when treatment is most effective.

Dr. Barry Hammaker, a general surgeon

Beyond age, certain warning signs should prompt you to discuss screening with your doctor regardless of your age. These include blood in your stool, unexplained changes in bowel habits, or persistent abdominal pain. Don't wait for a routine screening age if something feels off.

Who Should Get Screened and When?

Medicare and other health systems now recognize several risk categories that determine when you should begin screening:

• Average Risk: Begin screening at age 45 with a colonoscopy every 10 years if results are normal
• Family History: If a parent, sibling, or child has been diagnosed with colon cancer, start at age 40 or 10 years before their diagnosis age, whichever comes first
• High Risk: Those with a personal history of polyps or inflammatory bowel disease may need screening every 2 to 5 years, depending on findings

Medicare covers colorectal cancer screenings starting at age 45 for most people, including multi-target stool DNA tests like Cologuard every three years and screening colonoscopies every 10 years for average-risk individuals. If you're considered high risk, coverage extends to screenings every 2 years.

What Happens During a Colonoscopy?

Many people delay colonoscopy because they fear the procedure itself. The reality may surprise you: the actual examination is painless. You receive sedation, typically propofol, and remain asleep throughout. A colonoscopy lasts about 15 to 30 minutes, and you'll have little to no memory of it. The part people actually dread is the preparation, not the procedure.

If polyps are found during the exam, they're typically removed on the spot. This is actually the point of screening: removing polyps before they can develop into cancer. "If we see polyps, we take those out so they can't turn into a cancer because they're gone," noted Dr. Barry Hammaker. Polyps are sent to pathology, and depending on their type, number, and size, your next colonoscopy will be scheduled at one, three, five, or ten years out.

Dr. Barry Hammaker

How to Prepare for Your Colonoscopy

• Three to Four Days Before: Cut out insoluble fiber, which includes raw vegetables, fruit skins, beans, and toppings like chia seeds. These foods can interfere with bowel prep effectiveness
• Five Days Before (if needed): If you have chronic constipation, your doctor may recommend taking Miralax twice daily for up to five days before your prep day to help clear your system
• The Day Before: Most patients use a split-dose prep called SUPREP, with one dose around 6 p.m. and a second around 9 or 10 p.m. The medication works by drawing liquid into the colon to flush everything out
• Stay Hydrated Throughout: Drinking fluids is the single most important tip. "If somebody's not hydrated, the medicines don't work as well and we don't get as good of a clean out," Dr. Hammaker explained. Proper hydration makes the entire process work better and feel better

Recovery takes place at the facility, and you should be ready to go home about an hour after the procedure. However, you'll need a driver since sedation affects your ability to drive safely. By the next morning, you're back to normal and can return to work, exercise, and regular food. Bowel movements typically return within one to three days.

What If Something More Serious Is Found?

Occasionally, a colonoscopy reveals something requiring more than a scope to address. In these cases, robotic colectomy, a minimally invasive surgical approach, may be recommended. This technique uses specialized instruments and high-magnification visualization to remove sections of the colon through small incisions rather than one large opening.

Compared to traditional open surgery, robotic approaches result in less pain, faster return of bowel function, and shorter hospital stays, typically one to three days versus four to seven days. Most patients return to a regular diet within 24 to 48 hours of surgery.

The Bottom Line: Prevention Beats Treatment

Colorectal cancer is one of the most preventable cancers when caught early. A colonoscopy doesn't just detect cancer; in many cases, it stops cancer before it starts by removing precancerous polyps. The most common feedback doctors hear from first-time patients is that they wish they hadn't waited so long. "I always ask patients to be advocates for colon cancer screening," Dr. Hammaker said. "Let your friends know. It's not that big of a deal, and it can be lifesaving".

Dr. Hammaker

If you're nervous about scheduling a colonoscopy, many health systems offer office visits where you can ask questions and meet the team before committing to the procedure. Colon cancer prevention starts with a conversation with your doctor about your individual risk factors and screening timeline.