Rectal Cancer Is Rising Fast — And It's No Longer Just an Older Person's Disease

For decades, colon cancer was considered a disease of old age — something to worry about after 65, not at 40. That assumption is dangerously out of date. A landmark report released on March 2, 2026 reveals that rectal cancer is now one of the fastest-growing cancer diagnoses in middle-aged Americans — and the trends are alarming enough that doctors are urgently calling for earlier screening, greater public awareness, and more research into what is causing this shift. The Numbers: What the Report Found The 2026 Colorectal Cancer Statistics report — a triennial study released by the American Cancer Society and published in CA: A Cancer Journal for Clinicians — paints a stark picture of a disease moving in two very different directions at once. In adults aged 65 and older, colorectal cancer rates are falling — declining by about 2.5% per year from 2013 to 2022, driven by higher screening rates in that age group. But in adults under 65, the trend runs in exactly the opposite direction. Colorectal cancer rates are rising 3% per year in adults aged 20 to 49, and 0.4% per year in adults aged 50 to 64. Nearly half — 45% — of all new colorectal cancer cases are now occurring in adults under 65, up from just 27% in 1995. Rectal cancer specifically now accounts for 32% of all colorectal cancer diagnoses — up from 27% in the mid-2000s. The rate of rectal cancer diagnosis in people under 50 nearly doubled between 1998 and 2022. An estimated 158,850 new colorectal cancer cases will be diagnosed in the US in 2026 alone, with 55,230 expected deaths. For adults under 50, colorectal cancer is now the number one cause of cancer-related death — surpassing breast, prostate, and every other cancer in that age group. Why Rectal Cancer Specifically? Scientists are not yet certain what is driving the surge in rectal cancer among younger adults — and that uncertainty itself is an important part of the story. Physical inactivity and obesity are established risk factors for colon cancer in general, but research shows they are less strongly linked to rectal cancer specifically. That distinction suggests something else is at play — something environmental or dietary that is affecting the tissues of the rectum more than the rest of the large intestine. The leading theory among cancer researchers points to diet — specifically, the dramatic changes in how Americans eat that began in the mid-20th century. Ultra-processed foods, reduced fibre intake, changes in gut microbiome composition from antibiotics and dietary shifts, and increased consumption of red and processed meats are all under investigation. The timing of the birth-cohort effect — which shows that every generation born after the Baby Boomers has a progressively higher risk than the one before — points to an exposure or set of exposures introduced between roughly 1950 and 1980. What that exposure is exactly remains one of the most pressing open questions in cancer research today. Who Is Being Diagnosed — And at What Stage One of the most troubling findings in the report is not just who is getting rectal cancer, but how late it is being caught. Three in four colorectal cancers in adults under 50 are diagnosed at an advanced stage — regional or distant — meaning the disease has already spread before it is found. This is in large part because younger adults are not being screened regularly, because they — and sometimes their doctors — don't think of colorectal cancer as a disease that affects people in their 30s and 40s. The average time between a young patient first reporting symptoms and receiving a diagnosis is four to six months. That delay costs lives. The Symptoms You Cannot Ignore The symptoms of rectal cancer are often more noticeable than those of colon cancer — which is both a warning and an opportunity. Bright red blood on toilet paper or in the toilet bowl is the most common and important symptom. Rectal cancer can also cause a persistent feeling of urgency — the sensation of needing to have a bowel movement even immediately after one — as well as changes in stool shape or consistency, mucus in the stool, unexplained abdominal cramping, and unexplained weight loss or fatigue. None of these symptoms automatically mean cancer. Many have benign explanations. But any of them — particularly rectal bleeding or persistent changes in bowel habits — deserve a prompt conversation with your doctor. Do not dismiss them. Do not wait to see if they resolve on their own. What You Can Do: Screening Saves Lives The single most effective thing you can do to protect yourself from colorectal cancer is get screened. Current guidelines recommend that everyone — regardless of symptoms or family history — begin regular colorectal cancer screening at age 45. A colonoscopy every 10 years is the gold standard — it can both detect and prevent cancer by removing polyps before they become malignant. If a colonoscopy feels too daunting, a fecal immunochemical test — also called a FIT test — is a simple, inexpensive at-home stool test that is highly effective at detecting rectal cancers specifically and can be done annually. The FIT test does not replace colonoscopy but is a meaningful first step for anyone who has been putting off screening. If you have a family history of colorectal cancer, a personal history of inflammatory bowel disease, or symptoms that concern you, discuss earlier and more frequent screening with your doctor. Do not wait until 45 if your individual risk profile suggests otherwise. Beyond screening, the lifestyle factors that reduce colorectal cancer risk are well established: maintain a healthy weight, stay physically active, limit red and processed meat consumption, eat a fibre-rich diet with plenty of vegetables and whole grains, limit alcohol, and don't smoke. None of these guarantees protection — but together they meaningfully reduce your risk. Rectal cancer used to be an old man's disease. It isn't anymore. The data is clear. The time to act is now. For more health and wellness coverage, follow digital8hub.com.