Adults in the United States who never married face substantially higher cancer rates than their married peers, according to a large analysis published in April in Cancer Research Communications.
The gap ran to about 70 percent for men and 85 percent for women, with the sharpest differences appearing for cancers tied to HPV, alcohol and tobacco.
Researchers at Sylvester Comprehensive Cancer Center at the University of Miami analyzed more than 4 million cancer cases across 12 US states, diagnosed between 2015 and 2022. The base population topped 100 million adults aged 30 and older.
Where the gap is largest
The biggest differences showed up in cancers driven by infections. Never-married men had roughly five times the rate of anal cancer as married men, and never-married women had nearly three times the rate of cervical cancer.
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Both cancers are caused primarily by persistent HPV infection. Endometrial and ovarian cancers, which the researchers link partly to the protective effect of childbirth, were also more common in never-married women, and smoking- and alcohol-related cancers were significantly elevated across both sexes.
By contrast, breast, thyroid and prostate cancers showed weaker links to marital status. These are cancers with the most established screening programs, which the researchers said may already narrow the gap.
Why marriage itself is not the shield
The team is careful not to frame marriage as a biological shield. They point instead to the everyday scaffolding that often surrounds it, from shared routines and steadier finances to health insurance access and a partner who nudges you toward a doctor's appointment.
Never-married black men had the highest overall cancer rates in the analysis. Yet married black men had lower cancer rates than married white men, a pattern that argues against any purely biological explanation.
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What single adults can do
Study co-author Frank Penedo, associate director for population sciences at Sylvester, urged unmarried adults not to wait for symptoms.
For women, that means keeping up with cervical screening. The US Preventive Services Task Force recommends a Pap test every three years from ages 21 to 29.
From ages 30 to 65, screening options include a high-risk HPV test every five years, a Pap every three years, or co-testing that combines both every five years.
There is no universal anal cancer screening program in the United States. Adults with a personal HPV risk factor, including men who have sex with men and people living with HIV, should raise the option with their clinician.
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This article is made and published by Mie Hermansen, who may have used AI in the preparation.