Under-50 cancer diagnoses rising as deaths stay flat

Researchers and clinicians are reporting a rise in cancer diagnoses among adults under 50 in recent decades, but they disagree on whether the trend represents a true increase in dangerous disease or greater detection of indolent cases. Multiple studies covering cases from the 1990s through 2019 show higher incidence in several cancer types, while separate analyses find mortality for many of those cancers has remained largely unchanged.

A U.S. government analysis published in 2025 found that, among more than two million cases in people aged 15 to 49 from 2010 to 2019, 14 of 33 cancer types showed rising rates in at least one younger age group. The largest increases have been reported in breast, colorectal, kidney and uterine cancers. A study in JAMA Internal Medicine that examined the eight fastest rising cancers among adults under 50 thyroid, anus, kidney, small intestine, colorectal, endometrial, pancreas and myeloma found that diagnoses for those cancers roughly doubled since 1992 while mortality stayed relatively stable. The authors said that pattern is consistent with increased detection and overdiagnosis rather than a broad surge in lethal disease, although colorectal and...