New research published in the journal Cancer Research Communications has reignited a long-standing debate in medical science — does marriage lower your cancer risk? The study suggests it might, and the numbers are difficult to ignore. Never-married men face cancer rates 68% higher than men who have been married at some point, while never-married women face an even steeper gap, with cancer incidence rates 83% higher than their married counterparts. For a country like South Africa, where marriage rates have been shifting dramatically across cultural and generational lines, this research carries real weight.
The findings come at a time when marriage, globally and locally, is becoming less common. Dr. Andrew J. Cherlin, a professor emeritus at Johns Hopkins University who has spent his career studying family sociology, describes the shift starkly — suggesting society has essentially split in two when it comes to who benefits from the institution of marriage and who doesn’t. That divide, it now seems, may extend all the way to cancer wards.
What makes this study particularly interesting is who it says benefits most. Conventional wisdom has long held that men gain more from heterosexual marriages than women — but this research flips that narrative on its head. Women appear to receive greater cancer-risk protection from marriage than men do, a finding that surprised even outside experts. Dr. Brad Wilcox, a marriage researcher at the University of Virginia, called the statistic “striking,” noting that when it comes to cancer specifically, “putting a ring on it may offer more protection to women.”
Part of the explanation may lie in reproductive biology. Certain cancers — including endometrial and ovarian — are more prevalent in women who have never given birth, and married women are statistically more likely to have children. But that’s not the whole story.
Marriage and cancer risk: what the data actually tells us
Dr. Paulo S. Pinheiro, lead author of the study and an epidemiologist at the University of Miami Health System, notes that the protective effect appears to accumulate over time — meaning older married adults showed an even stronger correlation between matrimony and lower cancer rates. His team also found that marriage was strongly linked to lower rates of lung and cervical cancer, both of which are tied to risky lifestyle behaviours such as smoking, heavy drinking, and unprotected sex. The implication is that married people may simply engage in fewer of these behaviours.
There’s also the matter of healthcare access and social accountability. Married people are more likely to have medical aid coverage, more likely to be nudged by a partner to attend screenings, and less likely to let symptoms go unchecked. As Pinheiro put it, “If you’re unmarried and more isolated, you’re less likely to engage in screening or prevention.”
When race was factored in, the data showed that Black men appeared to benefit most from being married. Dr. Jarrod A. Carrol, a geriatrician at Kaiser Permanente in Southern California, attributed this to the central role Black women play in family health — encouraging partners to seek earlier treatment and serving as the primary support hub within the household.
Not everyone, however, is convinced the institution itself deserves the credit. Dr. Joan DelFattore, who has written extensively on cancer and marital status, argues that many of the so-called benefits of marriage are actually the result of systems that financially and socially reward married people — such as healthcare plans that cover spouses but not other dependants. She warns against oversimplifying the data to conclude that marriage is inherently good and singlehood is inherently bad.
DelFattore speaks from painful personal experience. Diagnosed with stage IV gallbladder cancer 15 years ago, she says her oncologist dismissed her capacity to handle aggressive treatment simply because she was unmarried — refusing to hear about the robust support network of cousins and friends she had in place. Her story, published in The New England Journal of Medicine, highlights how bias against single patients can actively worsen their outcomes.
Researchers agree that the path forward isn’t simply to encourage more people to marry. Pinheiro calls for greater investment in support systems for unmarried patients, and DelFattore argues the real priority should be dismantling the structural barriers that place single people at a disadvantage in the healthcare system. Strong friendships, engaged neighbours, and community networks can provide the same accountability and care that a spouse might — and the evidence, DelFattore insists, backs that up entirely.