A new study published in the journal Cancer Research Communications found that people who have never been married have significantly higher rates of cancer than those who have been married at some point in their lives. The findings add to a growing body of research linking marriage to better health outcomes, though experts say the relationship is complicated and the data should not be read as a prescription for how people should live.
The study classified anyone who had ever been married, separated, divorced, or widowed as "ever-married." Compared to that group, never-married men had cancer rates 68% higher. For women, the gap was even larger: never-married women had cancer rates 85% higher than their ever-married counterparts.
Researchers believe several factors are at work. "With how heterogeneous both cancer and individual behaviors can be, this is a nuanced question but to generalize broadly, being married is known to decrease exposure to many of the risk factors associated with various malignancies," said Dr. Ketan Thanki, a board-certified colorectal surgeon at the MemorialCare Todd Cancer Institute at Long Beach Medical Center, who was not involved in the study.
The psychological dimension may also matter. Deborah Vinall, a clinical psychologist and chief psychological officer with Recovered, pointed to loneliness as a key mechanism. "Loneliness is known to be fatal. This study makes that finding more concrete," she said. Vinall was not part of the research team but noted that the findings "demonstrate that marriage confers not only known social benefits but also downstream physiological benefits, highlighting the unity between mind and body."
Not everyone in the field accepts those conclusions without reservation. Joan DelFattore, a professor emerita of English and legal studies at the University of Delaware who has written about cancer and marital status for both academic journals and general audiences, argued that researchers often approach the subject with a built-in assumption. "People start from the assumption 'Marriage: good. No marriage: bad' and interpret things in ways that do not make sense in terms of actual data," she told CNN. DelFattore, who was not involved in the study, said this bias is embedded in medical training and research, and frequently leads to conclusions she describes as "over-simplified."
Her concern is not trivial. Marriage rates in the United States have been falling for years, meaning a growing share of the population would fall into the never-married category. If researchers interpret the data through a lens that treats marriage as inherently positive and singlehood as a deficit, that framing can shape both the questions asked and the conclusions drawn.
The study's authors acknowledged that the findings likely reflect multiple underlying causes rather than a single mechanism. Married people may be more likely to have consistent access to health care, social support, and partners who encourage them to seek medical attention when something is wrong. Reduced stress, healthier routines, and better financial stability are also commonly cited as factors associated with long-term partnerships.
What the study does not do is establish that marriage itself prevents cancer. The researchers noted that more work is needed to understand the pathways connecting marital status to cancer incidence and whether other forms of close social connection might produce similar benefits.
