Young adults are being urged to take four critical symptoms seriously as bowel cancer becomes an increasingly common threat for those under 50. In the United States, colorectal cancer is now the leading cause of cancer-related deaths in people younger than 50. Similarly, UK statistics show a 22% increase in bowel cancer diagnoses among adults aged 25 to 49 from the early 1990s to 2018.
While routine screening in the UK begins at age 50, experts warn that warning signs can appear much earlier and should never be ignored. The American College of Surgeons (ACS) has introduced a checklist to help patients recognize symptoms before visiting their primary care provider.
Marylise Boutros, a bowel cancer surgeon and ACS Patient Education Committee member, highlights that younger patients’ bowel symptoms are often mistakenly attributed to less serious conditions like hemorrhoids or constipation, leading to delayed diagnosis. “Awareness of subtle signs and symptoms can save lives,” she says.
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Though bowel cancer remains more common in older adults—in the UK, about one in 17 men and one in 20 women will develop it in their lifetime—cases among younger individuals are on the rise.
The ACS checklist identifies four key warning signs to watch for:
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Changes in bowel habits including constipation, diarrhea, unusually narrow stools, or a persistent change from normal patterns. Some may feel their bowel does not completely empty.
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Rectal pressure or discomfort, which may occur if a tumor causes inflammation or partial blockage.
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Blood in the stool, which is a significant indicator. Research presented at the ACS Clinical Congress 2025 showed that rectal bleeding increases the likelihood of a bowel cancer diagnosis by 8.5 times in patients under 50.
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Visible changes in stool appearance such as bright red blood, dark or tarry stools, or mucus presence—these may signify bleeding in the gastrointestinal tract.
While these symptoms don’t always mean cancer, ongoing or recurring signs should prompt medical evaluation.
Bowel cancer and other digestive conditions may also cause systemic symptoms like unexplained weight loss, persistent fatigue, reduced appetite, nausea, or vomiting. Such signs should not be ignored.
Dr. Boutros emphasizes, “Colorectal cancer is highly treatable when detected early, and advances in surgery have made treatments less invasive. I encourage people to be proactive and use the checklist to discuss any bowel changes with their healthcare provider.”
The NHS recommends seeing a GP if any bowel cancer symptoms last for three weeks or more.