Cancer Cases Rising Faster Among People Under 50: Study

Cancer cases are rising among people under 50 for several cancer types, with a new international analysis finding significant increases in early-onset cancers across England, the United States and the Netherlands. The World Cancer Research Fund International examined cancer-registry data and found statistically significant increases in seven cancer types in England, five in the US and four in the Netherlands.

The findings add to a growing body of research showing that some cancers are becoming more common in younger adults. However, the researchers and independent experts stress an important distinction: cancer is still much more common among older people, and the new analysis does not establish that lifestyle changes are solely responsible for the increases. Better awareness, more testing and changes in diagnosis may account for part of the rise, while environmental and biological factors are also being investigated.

Key takeaways

• The World Cancer Research Fund analysed 12 cancer types in people under 50.
• In England, significant increases were identified in seven cancer types.
• In the US, significant increases were found in five cancer types.
• In the Netherlands, significant increases were found in four cancer types.
• In England, prostate cancer incidence among men under 50 rose from 1 to 3.6 cases per 100,000 between 2001 and 2023.
• Bowel cancer incidence among people under 50 in England increased from 3.9 to 8.4 per 100,000.
• Breast cancer incidence among women under 50 increased from 42 to 47.5 per 100,000.
• Lung cancer rates among under-50s declined across all three countries studied.
• Researchers say obesity, diet, physical inactivity, environmental exposures and other factors may contribute, but no single cause has been established.
• Cancer remains considerably more common in people over 50, with the median age at diagnosis in developed countries generally above 60.

What the new analysis found

The World Cancer Research Fund examined official cancer data covering 12 site-specific cancers among people younger than 50.

For the United States and Netherlands, the analysis examined changes between 2000 and 2023. For England, researchers compared data from 2001 and 2023 and also examined trends over time.

The researchers were looking not simply for a larger number of cases, but for statistically significant trends in the number of diagnoses and incidence rates.

In England, significant increases were identified among women for breast, colorectal, cervical, uterine, kidney, liver, pancreatic and stomach cancers. Among men, significant increases were identified for colorectal, kidney, liver, pancreatic and prostate cancers.

The pattern was different in the US and Netherlands.

In the US, significant increases among women were found for breast, colorectal, uterine, kidney, liver, pancreatic and stomach cancers. Among men, colorectal, kidney, pancreatic and stomach cancers increased significantly.

In the Netherlands, significant increases were identified for cervical, colorectal, kidney and liver cancers among women and colorectal, kidney and liver cancers among men.

This variation is important because it suggests that early-onset cancer is not being driven by a single disease or a single factor shared equally across countries.

Prostate cancer shows one of the sharpest increases in England

One of the most striking findings concerns prostate cancer.

Among men under 50 in England, the incidence rate increased from 1 case per 100,000 in 2001 to 3.6 cases per 100,000 in 2023.

The number of diagnoses increased from 158 in 2001 to 640 in 2023.

That is more than a fourfold increase in the number of recorded diagnoses.

However, experts caution against interpreting the increase as proof that the underlying risk of clinically significant prostate cancer has increased by the same magnitude.

Jason Oke, a medical-statistics and cancer-research specialist at the University of Oxford, noted that PSA testing among men aged 40–49 increased substantially over the period. Greater testing can identify cancers earlier and can also detect some cancers that might otherwise never have become clinically apparent.

This illustrates a central issue with cancer statistics: more diagnoses do not necessarily mean the same-sized increase in the underlying disease burden.

Bowel cancer is another major concern

Colorectal, or bowel, cancer showed a substantial increase among younger adults.

In England, the incidence rate among people under 50 rose from 3.9 cases per 100,000 in 2001 to 8.4 per 100,000 in 2023.

That represents more than a doubling.

The increase is particularly significant because colorectal cancer has traditionally been associated more strongly with older age groups.

Similar increases were identified in the US and Netherlands, making colorectal cancer one of the clearest common threads across the three countries.

The trend has already become a major research priority, with researchers studying diet, gut health, lifestyle and environmental exposures to understand why colorectal cancer is appearing more frequently at younger ages.

Breast cancer remains the most common cancer among younger women

Breast cancer continues to account for a much larger number of diagnoses among women under 50 than many of the other cancer types examined.

In England, its incidence increased from 42 cases per 100,000 women under 50 in 2001 to 47.5 per 100,000 in 2023.

The increase is much smaller in percentage terms than the rise observed for some other cancers, but breast cancer remains important because its baseline incidence is substantially higher.

The US analysis also found an increase in breast cancer among younger women.

Researchers therefore consider breast cancer an important contributor to the overall increase in early-onset cancer diagnoses.

Kidney, uterine, pancreatic and liver cancers also increased

The trend extends beyond breast, bowel and prostate cancer.

In England, kidney cancer rates among women under 50 increased from 1.2 to 2.3 cases per 100,000, while rates among men increased from 1.9 to 3.6 per 100,000.

Uterine cancer among women increased from 1.8 to 3.9 per 100,000.

The analysis also identified significant increases in early-onset liver and pancreatic cancers.

In the US, kidney cancer among people under 50 increased from 2.5 cases per 100,000 in 2000 to 5.3 in 2023, according to the analysis.

Bowel, uterine and pancreatic cancers also increased by more than 50% in the US, while breast cancer rose by approximately 20%.

Lung cancer moved in the opposite direction

Not every cancer increased.

Lung cancer rates among people under 50 declined in England, the US and the Netherlands.

Experts associate this trend with the long-term decline in smoking in these populations.

The finding is significant because it demonstrates that cancer trends can move in different directions depending on the underlying risk factors.

It also provides a useful counterpoint to the idea that all cancers are simply increasing among younger people.

Some cancers are becoming more common, some are stable and others are declining.

Why are more younger people being diagnosed?

There is no single answer.

The World Cancer Research Fund explicitly says the causes of increasing early-onset cancer are not completely understood.

Researchers believe several factors may be interacting.

One area of attention is the increasing prevalence of overweight and obesity.

Other potential factors include lower physical activity, diets high in red and processed meat, fast foods and sugary drinks, and diets low in fibre.

Smoking, alcohol consumption and excessive exposure to ultraviolet radiation are also established cancer risk factors.

The WCRF estimates that approximately 40% of cancers are preventable through modifiable risk factors, although that figure refers to cancer overall and should not be interpreted as saying that 40% of early-onset cancers are caused by lifestyle.

Obesity may be part of the explanation

Obesity is receiving particular attention because its prevalence has increased across generations.

The WCRF says excess body weight can contribute to systemic inflammation, insulin resistance and hormonal changes that may affect cancer risk.

The World Health Organization has reported that obesity rates have risen sharply since the 1990s, with obesity among adults having approximately doubled and among adolescents quadrupled over that period.

The hypothesis is that younger generations may have been exposed to some cancer-related risk factors earlier in life and for longer periods.

But this remains a hypothesis rather than a complete explanation.

Cancer develops through complex interactions involving genetics, environmental exposures, cellular changes and other biological processes.

Diet and physical activity are also being investigated

Diet is another area researchers are examining closely.

The WCRF identifies diets high in red and processed meat, fast food and sugary drinks, along with low fibre intake, as risk factors associated with cancer.

Conversely, diets containing whole grains, vegetables, fruit and beans are associated with lower cancer risk.

Physical inactivity is another established risk factor.

However, researchers caution against reducing the entire early-onset cancer trend to individual lifestyle choices.

Population-level changes in environmental exposures, healthcare, diagnosis and biology could also be involved.

Environmental exposure and the gut microbiome

Scientists are also examining exposures that have changed over generations.

Potential areas of investigation include air pollution, water pollution, chemicals and plastics.

Researchers are additionally studying the gut microbiome—the enormous community of microorganisms living in the digestive system.

Diet, antibiotics and environmental exposures can influence the microbiome, and scientists are investigating whether long-term changes could affect inflammation, immunity and cancer development.

The WCRF emphasizes that no single environmental exposure has been identified as the explanation for the global increase in early-onset cancer.

Better detection may explain part of the increase

Another important factor is diagnosis.

People today may be more aware of cancer symptoms than previous generations.

They may also have greater access to diagnostic testing and medical imaging.

That can result in cancers being detected that previously would not have been diagnosed at the same age.

The effect may be especially important for cancers such as prostate cancer, where increased testing can substantially alter the number of recorded diagnoses.

Experts therefore say it is necessary to distinguish between a genuine increase in cancer occurrence and an increase in the detection of cancers that already existed.

The study does not prove that younger people now have a high overall cancer risk

This is perhaps the most important qualification.

The WCRF explicitly says that cancer remains less common among younger adults.

Age is still the strongest overall risk factor for cancer, and the median or average age at diagnosis in developed countries is generally above 60.

The new findings show that some specific cancers are becoming more common among younger people compared with previous generations.

They do not mean that cancer has suddenly become common among everyone under 50.

This distinction is also important when interpreting dramatic percentage increases.

For example, prostate cancer among men under 50 increased from 158 recorded diagnoses in England in 2001 to 640 in 2023.

That is a very large percentage increase, but the absolute incidence remained only 3.6 cases per 100,000 men in 2023.

Independent experts urge caution

Several scientists responding through the UK Science Media Centre said the findings are important but should not be interpreted as proof of a specific cause.

Professor Rhian Gabe of Queen Mary University of London said further epidemiological research is needed to determine how much of the change is associated with awareness, testing and improved detection and how much reflects changes in exposures.

Professor Amy Berrington of the Institute of Cancer Research also noted that comparisons with cancer rates among people over 50 would provide important context that is missing from the analysis.

Statistician Kevin McConway pointed out that simply comparing absolute case numbers can be misleading because the population size and age composition can change over time. Incidence rates provide a better basis for comparison.

The WCRF analysis does use incidence rates, but the experts’ broader point remains important: cancer registry statistics describe diagnosed and recorded disease, not every cancer that may exist in a population.

Earlier US research found a similar pattern

The new international analysis follows earlier research from the US National Cancer Institute.

A 2025 NCI analysis examined 33 cancer types and found that incidence increased for 14 types in at least one younger age group between 2010 and 2019.

However, incidence also declined for 19 cancer types among people under 50.

Importantly, the NCI reported that the overall rate of all cancers diagnosed did not increase in younger age groups, and cancer death rates did not rise overall.

The researchers said the reasons for increases in individual cancers could include changing risk factors, changes in screening and detection, and changes in clinical diagnosis or coding.

That earlier research reinforces the need to look at individual cancer types rather than treating “cancer in young people” as one uniform disease trend.

Why the findings matter for healthcare

If early-onset cancers continue to increase, healthcare systems may face growing pressure to identify symptoms earlier in younger adults.

Some younger patients may not initially consider cancer because of their age.

That can potentially contribute to delayed investigation when symptoms persist.

At the same time, expanding screening indiscriminately to younger populations is not automatically the answer.

Screening can detect disease earlier, but it can also produce false positives, unnecessary procedures and overdiagnosis.

The challenge is to identify which younger populations and which symptoms warrant earlier investigation without creating unnecessary medical interventions.

What people can do now

The research does not provide a reason for younger people to panic.

It does, however, reinforce established cancer-prevention advice.

Maintaining a healthy body weight, being physically active, eating a diet rich in whole grains, vegetables, fruit and beans, avoiding tobacco and limiting alcohol can reduce exposure to several known cancer risk factors.

People should also pay attention to persistent or unusual changes in their health.

A new lump, unexplained weight loss, unusual bleeding or persistent changes in bowel or urinary habits can have many causes and do not automatically mean cancer. But persistent symptoms should not be ignored simply because someone is young.

The NHS has similarly advised people to seek medical attention when they notice persistent or unusual changes.

The bigger picture

The new analysis adds to a growing international concern about early-onset cancer, but it does not yet provide a single explanation for the trend.

The strongest conclusion is narrower: several specific cancers are being diagnosed more frequently among people under 50 than they were in previous generations, and the pattern appears across multiple countries.

At the same time, cancer remains predominantly a disease of older age, and some cancers—including lung cancer among younger people—are declining.

The next phase of research will need to separate genuine changes in cancer biology and risk from changes in screening, awareness and diagnosis.

Looking Ahead

Understanding why early-onset cancer is changing will require large, long-term studies that combine cancer registries with information about diet, body weight, physical activity, environmental exposures, genetics, infections and the gut microbiome. The WCRF says early-onset cancer has become a major research priority, while new studies are already examining how lifestyle and environmental changes may influence risk.

For now, the findings are best viewed as a warning signal rather than a reason for alarm. Younger adults remain at substantially lower overall risk than older adults, but the increase in several specific cancers means researchers and healthcare systems cannot assume that cancer is exclusively an older person’s disease. Earlier recognition of persistent symptoms, stronger prevention efforts and better research into the causes of early-onset disease will be increasingly important.