Rectal cancer deaths surge among young adults, outpacing colon cancer

A troubling pattern is emerging in American cancer mortality: rectal cancer is killing younger people at a pace that far outstrips colon cancer, and the gap is widening. Among adults between 20 and 44, rectal cancer deaths are climbing two to three times faster than colon cancer deaths, according to research being presented this week at Digestive Disease Week 2026 in Chicago. The data carries a particular warning for older millennials—those now in their late thirties and early forties—whose rectal cancer mortality is projected to keep rising through the next decade.

Mythili Menon Pathiyil, a gastroenterology fellow at SUNY Upstate Medical University and lead author of the study, framed the shift plainly: colorectal cancer is no longer a disease primarily of the elderly. Rectal cancer especially has become a growing threat to younger individuals. The researchers built their findings on two decades of death records from the CDC, spanning 1999 to 2023, then used machine learning to project where the numbers are headed. The mortality gap between rectal and colon cancer is widening across every demographic group studied, though Hispanic adults and people living in Western states have experienced the steepest climbs.

One of the most striking findings concerns timing. When an older adult develops rectal cancer symptoms, they typically begin treatment within a month. Young adults wait an average of seven months before receiving care—a delay that can mean the difference between catching disease early and confronting an aggressive, advanced stage. Part of this gap stems from how symptoms are interpreted. Primary care providers frequently dismiss the warning signs that younger patients report—rectal bleeding, changes in bowel habits, narrow stools, a sense that bowel movements are incomplete—as hemorrhoids or other benign conditions. A young person describing these symptoms may be reassured rather than referred for further evaluation.

Rachel Gordon, a colorectal surgeon at Episcopal Health Services in New York, noted that young people are arriving at diagnosis with cancers that are already advanced and aggressive. She pointed to a constellation of factors that may be driving the increase: shifts in diet, changes in the gut microbiome, and various lifestyle and environmental exposures that differ from those experienced by previous generations. The exact mechanisms remain unclear, but the trend is unmistakable.

Pathiyil emphasized that current screening strategies were designed with older populations in mind and may need fundamental rethinking. "Rectal cancer is driving much of the increase in colorectal cancers," she said, and without a shift in how the medical system approaches younger patients—both in terms of taking their symptoms seriously and in terms of screening protocols—the problem will only deepen. The message to younger adults is direct: if you experience rectal bleeding, persistent changes in bowel habits, narrow stools, a feeling of incomplete emptying, abdominal pain, unexplained weight loss, or fatigue, see a doctor promptly. What feels like a minor issue to a primary care provider accustomed to seeing these symptoms in older patients may be something far more serious.