New Data Shows Surge in Bowel and Ovarian Cancer Among Young Adults

Cancer is no longer just a disease of aging-an unsettling shift is emerging among younger adults worldwide. A new analysis published in BMJ Oncology highlights rising cancer rates, particularly among people under 50, echoing a broader global trend that researchers are struggling to fully explain.

The study, based on data from the National Disease Registry Service between 2001 and 2019, found significant increases in multiple cancers among younger adults. These included bowel, ovarian, breast, pancreatic, kidney, and thyroid cancers. Notably, bowel and ovarian cancers showed a unique pattern—rising only in younger adults, not in older populations.

Globally, similar patterns have been reported in regions including North America, Europe, and parts of Asia, where early-onset cancers—especially colorectal cancer—are increasing.

Researchers linked many of these cancers to known lifestyle risk factors such as obesity, smoking, alcohol use, poor diet, and physical inactivity. Among these, excess weight stood out as the most consistent contributor, associated with 10 out of 11 cancers studied. However, a puzzling finding emerged: while obesity rates have risen, other risk factors like smoking and red meat consumption have generally improved or remained stable in younger populations.

This mismatch suggests that traditional explanations may not be enough. Scientists are now exploring additional contributors, including ultra-processed foods, sedentary lifestyles, early-life exposures, antibiotic use, and even disruptions in the gut microbiome. Changes in screening and earlier detection may also partly explain rising incidence.

Despite the increase, experts stress perspective. Cancer burden remains significantly higher in older adults globally. Still, the steady rise among younger people is concerning and signals a need for deeper investigation.

Ultimately, the findings point to a complex interplay of factors—where modern lifestyles, environmental exposures, and possibly biological changes are reshaping cancer risk across generations.

REFERENCE: Garcia-Closas, M., et al. (2026) Temporal trends in behavioural risk factors for cancers with rising incidence in younger adults: an analysis of population-based data in England. BMJ Oncology. DOI: 10.1136/bmjonc-2025-000966. https://bmjoncology.bmj.com/content/5/1/e000966