Cases of bowel and ovarian cancer are rising, but only among people under 50, according to research published in the British Medical Journal Oncology today, April 28, 2026. While other types of cancer are also rising in older adults, this particular trend among younger adults is striking.
A key factor, the researchers’ work suggests, is excess weight. But that does not fully explain the trends they saw.
In particular, there was a significant rise in 11 cancers among the younger adults with known behavioral risk factors. These cancers were: thyroid, multiple myeloma, liver, kidney, gallbladder, bowel, pancreatic, womb lining (endometrial), mouth, breast, and ovarian cancers.
Rates of all these cancers also rose significantly among the older adults, with the notable exceptions of bowel and ovarian cancers.
Besides mouth cancer, all 11 cancers associated with known behavioral risks were linked to obesity. And six (liver, bowel, mouth, pancreas, kidney, and ovary) were also linked to smoking; four (liver, bowel, mouth, and breast) were associated with alcohol intake; three (bowel, breast, and endometrial) were linked to physical inactivity; and one (bowel) was associated with dietary factors.
“Of the 11 cancers we identified which were increasing and linked to known lifestyle factors—the most common by far in younger adults was breast cancer,” the study’s lead author, professor Montserrat Garcia-Closas, MD, DrPH, told Inside Precision Medicine. Garcia-Closas is in Integrative Cancer Epidemiology, Division of Genetics and Epidemiology, and The Cancer Epidemiology and Prevention Research Unit, The Institute of Cancer Research, London.
The rising incidence of certain cancers among people under 50 isn’t unique to England, and one major question is whether changes in behavioral risk factors might be to blame.
This research group analyzed cancer incidence trends in England from the National Disease Registry Service for the period 2001 to 2019, comparing patterns by sex in two age groups: 20–49 year olds and those aged 50+ for more than 20 different cancer types.
This database, “Captures virtually every cancer diagnosis in England going back decades—one of the most complete registries in the world. That scale is what allows us to track trends reliably across the whole population, not just a sample,” said Garcia-Closas.
The team used national health surveys to look at trends in established risk factors: smoking, alcohol intake; diet (high red/processed meat, low fiber intake), excess weight (BMI), and physical inactivity to quantify any changes by age and sex and estimate the proportion of cancers attributable to specific risk factors.
Their analysis showed that new cases of 16 out of 22 cancers in younger women, and 11 out of 21 cancers in younger men, increased significantly in England between 2001 and 2019.
And five cancers—endometrial, kidney, pancreatic, multiple myeloma, and thyroid cancer— increased significantly faster in younger than in older women, while multiple myeloma increased faster in younger than in older men.
But with the exception of excess weight, trends in these risk factors over the past one to two decades have been stable or improving for younger adults, with the largest reductions of around 7% in red meat consumption.
The average daily amount of red meat eaten, they report, fell from 38 grams in 2008 to 17 grams in 2018 among younger men, and from 22 grams to 10 grams in younger women. And average processed meat intake in younger women was half that of younger men: 10 grams versus around 20 grams. And while more than 90% of younger adults weren’t eating enough fiber in 2018, their intake remained stable or slightly improved in both sexes between 2009 and 2019. And these trends were similar in older adults.
Established behavioral risk factors accounted for a substantial share of cancer cases. In 2019 these contributed 68%–65% of mouth cancers for younger and older men, respectively; 42%–48% of liver cancers; 49%–53% of bowel cancers, 29%–33% of kidney cancers, and 36%–34% of pancreatic cancers.
Among women they accounted for 52%–45% of mouth cancers; 35%–42% of endometrial cancers; 44%–46% of liver cancers; 38%–42% of bowel cancers; 33%–37% of kidney cancers; 31%–28% of pancreatic cancers; and 19% to 24% of gallbladder cancers.
Excess weight was the risk factor associated with most cancers in 2019, ranging from 5% for ovarian cancer to 37% for endometrial cancers.
“These patterns suggest that while similar risk factors across ages are likely, some cancers may have age-specific exposures, susceptibilities, or differences in screening and detection practices,” write the researchers.
“Prevention takes a long time and we must act now with what we know, with better and more effective public health policy and programs to address the overweight and obesity epidemic,” said Garcia-Closas.
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