Trends and burden of lip and oral cavity cancer among young people aged 15–39 years in China from 1990 to 2023：A systematic analysis of the Global Burden of Disease Study 2023
Unlike the rising global trend, the burden of lip and oral cavity cancer among Chinese adolescents and young adults (aged 15–39) significantly declined from 1990 to 2023 due to epidemiological improvements, though the burden has shifted toward the 30–39 age group and created a growing cohort of survivors requiring long-term care.
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For decades, doctors have understood lip and oral cavity cancer as a disease of later life, a condition that typically strikes after years of cumulative exposure to tobacco, alcohol, or the chewing of betel nuts. In most parts of the world, the risk of developing this illness rises sharply after age fifty, leaving younger adults largely untouched. However, in recent years, a quiet shift has been detected in high-income nations, where cases among people under forty are beginning to climb, particularly in women who have never smoked or drank. This emerging pattern has puzzled researchers, who cannot yet explain why a disease once tied strictly to long-term habits is appearing in the young. The question of whether this global trend has reached China, home to the world's largest population of adolescents and young adults, has remained unanswered until now. Understanding the true state of this disease in China matters because the country's unique mix of changing habits, improving healthcare, and shifting population demographics could tell us whether the global rise is a universal phenomenon or a story specific to certain regions.
A team of researchers turned to the Global Burden of Disease Study 2023 to settle this question, examining data spanning from 1990 to 2023. They focused specifically on people aged fifteen to thirty-nine, tracking new cases, deaths, and the total years of healthy life lost due to the disease. Their analysis revealed a story that runs counter to the rising global pattern. In China, the burden of lip and oral cavity cancer among young people has fallen substantially over the last three decades. The number of new cases dropped by more than a quarter, while deaths fell by half. The total loss of healthy life, a measure that combines the years lost to early death with the years lived in poor health, decreased by more than half. This decline was not merely a side effect of a shrinking young population; the researchers found that the risk of developing the disease for any given individual actually decreased, driven by genuine improvements in health and safety rather than just demographic changes.
Yet, this overall success hides a significant shift in where the disease is striking. The burden has migrated decisively toward the older end of the young adult spectrum. While cases plummeted among teenagers and those in their early twenties, the number of new cases among people aged thirty to thirty-nine has not fallen and, in some groups, has actually risen. In 1990, people in their thirties accounted for just over half of the disease burden in this age group; by 2023, they accounted for nearly four-fifths. This concentration is critical because routine oral health checks in China are most common in schools and dental clinics that reach teenagers, leaving adults in their thirties with far less frequent screening. The researchers suggest that the disease is now hiding in a demographic that is harder to reach with standard prevention efforts.
The study also uncovered a widening gap between men and women. While the disease rates for young women have fallen sharply, the rates for young men have remained stubbornly flat or even increased slightly in the oldest age groups. This divergence points to specific exposures that affect men more than women. The researchers point to the rising consumption of betel nuts, a known carcinogen that is increasingly marketed as a commercial product across China and is heavily used by young men. Unlike tobacco, which has seen a slow decline in use among younger Chinese men, betel nut use has expanded. This suggests that while traditional risk factors like smoking are receding, a new, potent driver is taking their place for men, keeping their risk levels high even as the overall numbers for the country drop.
Perhaps the most profound finding concerns the people who survive the disease. As medical care has improved, fewer young people are dying from lip and oral cavity cancer, but more are living with it. The researchers found that while fewer young people are being diagnosed today than thirty years ago, almost as many are still alive with the condition. This is because those who do get the disease are living longer with it, often facing decades of challenges related to speech, eating, and appearance. The number of young survivors is growing, creating a population that needs long-term care and support. Currently, China lacks a dedicated national program to help these young survivors navigate life after cancer, leaving a gap in the healthcare system that is becoming larger every year.
The researchers remain cautious about one specific period in their data. Between 2015 and 2021, the numbers suggested a brief, sharp rise in cases before falling again. They believe this spike was likely an artifact of data collection disruptions during the pandemic rather than a true resurgence of the disease, and they urge that this period be watched closely in future studies. Ultimately, the picture that emerges is one of a nation that has successfully reduced the overall threat of this cancer for its youth, but one that must now turn its attention to the specific groups where the risk remains high: men in their thirties and the growing cohort of young survivors who need care that the current system does not yet provide.
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