Colorectal cancer becomes leading cancer killer in adults under 50

Colorectal cancer is now the top cause of cancer death in people under 50

Colorectal cancer has emerged as the leading cause of cancer-related deaths among adults younger than 50, according to a new report published in the Journal of the American Medical Association (JAMA). While overall cancer mortality in this age group has declined since 1990, deaths from colorectal cancer have continued to rise, making it a troubling exception to the broader trend.

Experts describe the findings as both alarming and deeply concerning. Dr Melissa Lumish, Assistant Professor at the Case Comprehensive Cancer Center, said the rise in deaths among younger adults is “really startling and scary,” but not entirely unexpected given the steady increase in cases over the past two decades.

A shift in cancer mortality trends

Researchers examined deaths from the five leading cancers affecting people under 50 over the past 30 years. In 1990, lung and bronchus cancer was the top killer in this age group, followed by breast cancer, leukemia, brain and nervous system cancers, and colorectal cancer.

Since 2014, deaths from lung cancer have declined by 5.7 percent annually, breast cancer by 1.4 percent, leukemia by 2.3 percent, and brain cancer by 0.3 percent. In contrast, colorectal cancer deaths have increased by about 1.1 percent every year, eventually surpassing all others.

Dr Lilian Chen, Chief of Colon and Rectal Surgery at Tufts Medical Center, called the trend “a wake-up call.” She noted that while other major cancer death rates are falling, colorectal cancer is moving in the opposite direction among younger adults.

Why younger adults are increasingly affected

The rise in deaths reflects a parallel increase in colorectal cancer cases among people under 50. Since 2000, incidence in this group has grown by 1.4 percent annually, while rates among those over 50 have dropped by more than 3 percent each year.

Scientists have not identified a single cause behind this shift. Dr Chen said multiple factors may be contributing, including changes in diet, increasing obesity, sedentary lifestyles, alterations in gut bacteria, and environmental exposures.

Dr Lumish added that the disease is appearing even in young, physically active individuals with healthy diets, highlighting how unpredictable and complex the trend has become.

Another major concern is late diagnosis. Nearly three out of four colorectal cancer patients under 50 are diagnosed at an advanced stage, which helps explain the rising death rate despite improvements in treatment.

The role of early detection

Health experts stress that screening remains the most powerful tool to reverse this trend. Current guidelines recommend beginning colorectal cancer screening at age 45, or earlier for those with a family history or known risk factors.

Dr Lumish explained that individuals with a first-degree relative diagnosed before 50 should start screening 10 years earlier than the age at which their relative was diagnosed. For example, if a parent or sibling was diagnosed at 45, screening should begin at 35.

Because about half of colorectal cancer cases in younger adults occur before the age of 45, doctors also urge people to recognize warning signs. These include persistent abdominal pain, rectal bleeding, ongoing diarrhea, and iron deficiency anemia.

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Dr Chen emphasized that early detection can save lives. She said that identifying cancer before it spreads remains the single most effective way to reduce mortality and protect younger populations from this growing threat.

A public health warning

The rise of colorectal cancer deaths among young adults is reshaping the understanding of cancer risk and prevention. What was once considered a disease of older age is now a serious danger for people in their 30s and 40s.

Public health specialists warn that awareness, timely screening, and attention to symptoms are essential. Without stronger preventive measures and earlier diagnosis, the burden of colorectal cancer in younger adults is likely to continue growing.

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