Rise in early-onset colorectal and GI cancers concerns experts
Colorectal cancer and other gastrointestinal (GI) cancers are seeing a troubling rise in people under the age of 50, according to recent global studies. While cancer is generally associated with aging, this unexpected spike in early-onset GI cancers, including colorectal, gastric, and rectal cancers, is raising alarms among researchers and clinicians.
Significant increase among younger populations A comprehensive review published in The British Journal of Surgery found that early-onset colorectal cancer cases in the United States rose by 14.8% between 2010 and 2019. Globally, similar trends are emerging. The CDC Wonder database recorded a staggering 333% increase in colorectal cancers among 15–19-year-olds and a 185% rise in the 20–24 age group.
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Despite the low absolute number of cases compared to older adults, these increases indicate a shift that warrants targeted public health responses.
Contributing risk factors The exact cause remains unclear. However, multiple contributing factors have been identified:
- Obesity and sedentary lifestyle
- Western-style diets high in red meat, processed foods, and sugar-sweetened beverages
- Alcohol and tobacco use
- Environmental exposures, including microplastics
- Gut microbiome imbalance due to diet or antibiotic overuse
- Chronic stress
Dr. Anton Bilchik, Chief of Medicine at Providence Saint John’s Cancer Institute, emphasized that the increase is not solely driven by obesity or genetic predisposition, but potentially by lifestyle and environmental influences that disrupt immune function and gut bacteria.
Rising prevalence in colon and rectal cancers Data show that individuals born in 1990 are more than twice as likely to develop colon cancer and over four times as likely to develop rectal cancer compared to those born in 1950. European studies also confirm similar upward trends, particularly among 20–29 year olds.
Gastric cancers linked to bacterial infections In parallel, a study in Nature Medicine projects 15.6 million new gastric cancer cases in coming decades, 76% of which may be preventable through eradication of Helicobacter pylori, a common bacterial infection. This points to an urgent need for global prevention and education strategies.
Calls for earlier screening and awareness Currently, the US Preventive Services Task Force recommends colorectal cancer screening starting at age 45. Experts now argue for even earlier screening, especially for high-risk individuals, such as those with a family history or symptoms like blood in stool or persistent abdominal pain.
"Given the disproportionate increase in Black and Hispanic populations, the screening age may need to be reduced to 40," said Dr. Bilchik.
Dr. Sara K. Char, Clinical Oncology Fellow at Dana Farber Cancer Institute, added that although younger patients may not show classic risk profiles, tailored research and screening protocols are vital.
What individuals can do Preventive measures include:
- Eating a fiber-rich, low-processed diet
- Avoiding tobacco and limiting alcohol
- Staying physically active (at least 30 minutes, five days a week)
- Treating vitamin D deficiency
- Maintaining good gut health
While scientists continue to investigate the precise causes of early-onset GI cancers, it is clear that awareness, lifestyle changes, and earlier screening could play a major role in curbing this growing trend. Public health systems must adapt quickly to protect younger generations from what was once considered a disease of older age.
Stay informed. Stay ahead.
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