When something feels off in your body, it is easy to look for simple explanations. A strange stomach issue becomes stress.
Constant tiredness gets blamed on work or screens. For most young adults, serious illness is not part of the mental checklist.
But behind the scenes, doctors are seeing a shift that challenges that sense of safety. A disease long associated with later life is appearing earlier, and often without obvious warning. The reasons may stretch back further than anyone expected.
A worrying medical shift
Colon cancer is now rising fastest among people in their 20s and 30s. US cancer doctor Tim Cannon began noticing that his patients were getting younger and that the disease often appeared more aggressive.
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Even among physically active adults, his research found unusually high levels of precancerous changes.
Other experts, including teams at Dana-Farber Cancer Institute, report similar trends. Younger patients are often treated quickly and aggressively, yet survival rates are not improving as much as expected. That contradiction has pushed researchers to rethink where risk really begins.
Clues from early childhood
Scientists are now looking beyond adult lifestyle and into infancy. Molecular biologist Ludmil Alexandrov from the University of California San Diego has identified a DNA mutation common in many colorectal tumors in patients under 40.
The mutation is linked to colibactin, a toxin produced by certain strains of E. coli that can affect babies within their first months.
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The theory suggests that damage may occur decades before cancer develops, creating a long and silent lead-up.
Why awareness matters
Colon cancer is often diagnosed late because early symptoms are vague. Warning signs can include changes in bowel habits, blood in stool, ongoing abdominal discomfort, unexplained weight loss, and persistent fatigue.
Once the disease spreads, survival rates drop sharply. Researchers say earlier screening and better understanding of early-life factors could be key to slowing this growing trend.
Sources: Unilad
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