Rectal cancer deaths among young adults rising 2-3x faster than colon cancer

Something is shifting in the landscape of American cancer mortality, and it is happening fastest among the young. Rectal cancer deaths are accelerating through the population of adults aged 20 to 44 at a rate two to three times faster than colon cancer deaths in the same age group—a divergence that researchers say will only widen through 2035 unless treatment strategies change fundamentally.

The finding comes from a study analyzing three decades of mortality data compiled by the Centers for Disease Control and Prevention, spanning 1999 to 2023. Researchers at SUNY Upstate Medical University used machine learning models to project the trajectory forward, and the picture they found is troubling. For older millennials specifically—those between 35 and 44—rectal cancer mortality is expected to climb steadily over the next decade. The gap between rectal and colon cancer deaths is widening across every demographic group studied, but the burden is not distributed evenly. Hispanic adults and people living in Western states are experiencing the steepest increases.

What makes this pattern particularly alarming is not just the speed of the rise, but the stage at which young people are being diagnosed. They are arriving at their doctors' offices with disease that is already advanced and aggressive. Mythili Menon Pathiyil, the lead researcher, noted that colorectal cancer has shed its reputation as a disease of the elderly. Rectal cancer, in particular, is becoming a distinct and growing problem in younger individuals.

The delay between first symptoms and actual diagnosis tells much of the story. Older adults typically begin treatment within a month of noticing something wrong. Young adults wait an average of seven months. That gap is not accidental. Primary care providers, trained to think of rectal bleeding or changes in bowel habits as benign—hemorrhoids, dietary issues, stress—often dismiss these red flags in younger patients. By the time a young person pushes hard enough to get imaging or specialist evaluation, the cancer has had months to advance.

Rachel Gordon, a colorectal surgeon at Episcopal Health Services in New York, pointed to a constellation of lifestyle and environmental factors that may be contributing to the rise: diet, changes in the gut microbiome, and other exposures that differ from those faced by previous generations. The exact mechanisms remain unclear, but the trend is unmistakable.

The research suggests that current screening protocols were designed for a different population and a different disease pattern. Pathiyil emphasized that rectal cancer is driving much of the overall increase in colorectal cancers among young adults—a fact that existing screening strategies do not adequately address. Without a deliberate shift in how doctors approach symptoms in younger patients, and without a reevaluation of who should be screened and when, the trajectory will continue its upward slope.

The warning signs are specific and concrete: bright red or dark rectal bleeding, persistent changes in bowel habits including diarrhea or constipation, narrow stools, a sense that bowel movements are incomplete, abdominal pain, unexplained weight loss, or fatigue. Gordon's advice is direct: if something feels wrong, see a doctor promptly. The cost of waiting—of assuming youth means benign—is becoming measurable in mortality rates that climb faster with each passing year.