Colorectal cancer is the third most commonly diagnosed cancer and the second leading cause of cancer death in the United States, but early detection changes everything. When caught before symptoms appear, the five-year survival rate for localized colorectal cancer reaches nearly 90 percent. The catch? Many people delay screening because they feel fine, missing the opportunity to catch precancerous polyps or early-stage cancer when treatment is most effective. Why Starting Screening at 45 Could Save Your Life? Current government guidelines recommend that adults at average risk begin colorectal cancer screening at age 45 and continue through age 75. However, your personal and family medical history can change this timeline significantly. If a first-degree relative, such as a parent or sibling, was diagnosed with colorectal cancer, you should start screening 10 years earlier than the age at which they were diagnosed. For example, if your parent received a diagnosis at age 47, you would begin screening at age 37. Knowing your family history is critical. "If a first-degree relative was diagnosed with colorectal cancer, your screening should begin 10 years earlier than the age at which they were diagnosed," explains Nicanda Gordon, M.D., a family medicine physician at Baptist Health Primary Care. "So if your parent was diagnosed at 47, you would start screening at age 37". Additionally, people with inflammatory bowel disease, prior polyps, or certain genetic conditions require earlier and more frequent evaluations. Which Screening Test Is Right for You? The good news is that you have options. Multiple effective screening methods exist, and the best choice depends on your risk factors, medical history, and personal preference. Understanding each option helps you choose a test you'll actually complete, since the most effective screening is the one that gets done. How to Choose Your Colorectal Cancer Screening Method - Stool-Based Tests: These non-invasive tests check for hidden blood or altered DNA in samples you collect at home. The Fecal Immunochemical Test (FIT) uses antibodies to detect blood and is completed yearly. The FIT-DNA test combines FIT with DNA detection and is done every three years. - Colonoscopy: A physician examines your entire colon using a flexible, lighted tube and can remove precancerous polyps during the same procedure. Average-risk patients schedule this every 10 years, making it the most comprehensive option available. - Imaging-Based Screening: CT colonography, also called virtual colonoscopy, uses imaging technology to produce detailed pictures of your entire colon and is scheduled every five years. Flexible sigmoidoscopy examines only the lower third of the colon and is also done every five years. - Blood Tests: Recent advancements offer blood tests that check for genetic changes associated with colorectal cancer, administered in a clinical setting by medical professionals. "For average-risk patients, we discuss options such as stool-based DNA testing or colonoscopy," Dr. Gordon explains. "Both are effective when done appropriately. The most important factor is choosing a screening method the patient is comfortable completing. A screening test only works if it gets done". If you receive an abnormal result from a stool-based test, virtual colonoscopy, or blood test, a traditional colonoscopy is essential to complete the evaluation and determine if polyps or cancer are present. What Lifestyle Changes Reduce Your Colorectal Cancer Risk? Beyond scheduling a screening, adjusting your lifestyle habits can meaningfully lower your risk. The connection between heart health and gut health is stronger than many people realize. "What's good for your heart is usually good for your gut," Dr. Gordon notes. This includes staying physically active to maintain a healthy body mass index (BMI), eating well-balanced, fiber-rich meals low in ultra-processed foods, minimizing consumption of nitrate-rich processed meats, and avoiding smoking or vaping. Specific dietary and lifestyle modifications supported by evidence include maintaining a healthy weight, staying physically active with regular exercise, eating a diet rich in fruits, vegetables, and whole grains, limiting red meat and avoiding processed meats, not smoking or quitting if you do, limiting alcohol consumption, and getting adequate vitamin D and calcium through your diet. What Warning Signs Shouldn't You Ignore? Many people delay seeking care because they don't recognize early warning signs. Don't wait for your next scheduled screening if you experience any of these symptoms: blood in your stool or rectal bleeding, a persistent change in bowel habits such as diarrhea, constipation, or narrower stools lasting several weeks, persistent abdominal pain or cramping, unexplained weight loss, weakness or fatigue, or the feeling that your bowel doesn't empty completely. These symptoms can be caused by many conditions other than cancer, but it's important to get them checked out promptly. Even if you think it might just be hemorrhoids, see your doctor, as hemorrhoids don't rule out the possibility of colorectal cancer. Younger adults under age 50 are increasingly being diagnosed with colorectal cancer. If you're experiencing symptoms, don't assume you're too young to be at risk. Speak up and advocate for yourself with your healthcare provider, as early diagnosis makes a significant difference in outcomes. "Detecting precancerous polyps early, or identifying cancer at an early stage, can mean years more with your loved ones," Dr. Gordon emphasizes. "Time is our most valuable resource, and preventive care is one of the most powerful ways we can protect it. Being proactive today can profoundly change tomorrow".
