Study Finds Never-Married Adults Have Higher Cancer Risk

Marital status linked to differences in cancer incidence across multiple cancer types

Apr. 16, 2026 at 12:07pm

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A translucent, ghostly X-ray image revealing the abstract, glowing structure of a human heart, conceptually representing the internal biological mechanisms that may link marital status to cancer risk.An X-ray view into the complex biological factors that may connect marital status to cancer risk.Boston Today

A large population-based study found that adults who have never been married had a higher cancer risk than their married or previously married peers, with patterns observed across many major cancer types. The findings suggest marital status may help identify groups with different patterns of cancer risk, likely reflecting social and lifestyle behaviors rather than a direct causal effect.

Why it matters

The study fills an important data gap on the relationship between marital status and cancer incidence, providing insights that could help identify high-risk populations and inform cancer prevention efforts. While the study does not establish causation, it suggests marital status may be a marker for accumulated social and behavioral factors that influence cancer risk.

The details

The analysis included data on more than 4.2 million cancer cases diagnosed between 2015 and 2022 across 12 US states. Compared to ever-married individuals, never-married men and women had higher cancer incidence rates across many major cancer types, racial and ethnic groups, and age groups. The excess risks were particularly strong for cancers linked to infections, smoking, and reproductive factors.

  • The study analyzed cancer data from 2015 to 2022.
  • The findings were published online on April 8, 2026.

The players

Paulo Pinheiro

First author of the study and researcher at Sylvester Comprehensive Cancer Center, University of Miami Health System.

Gilbert Welch

General internist and senior investigator at the Center for Surgery and Public Health, Brigham and Women's Hospital in Boston.

Linda Waite

Professor in the Department of Sociology at the University of Chicago.

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What they’re saying

“As with any observational study, we cannot establish causation, and unmeasured factors may contribute to the associations.”

— Paulo Pinheiro, Researcher

“Marital status is therefore best understood as a marker of those accumulated factors.”

— Paulo Pinheiro, Researcher

“That said, it wouldn't be crazy to suggest marriage drives some of these risk factors. Married couples benefit from combined incomes and shared expenses, and may well help support individuals in making healthy choices (like not smoking).”

— Gilbert Welch, General Internist

“For men, not having a spouse may 'disadvantage' them in ways that might increase cancer risk. Unmarried men are more likely to drink and smoke heavily, which increase cancer risk.”

— Linda Waite, Professor of Sociology

What’s next

Researchers plan to further investigate the complex interactions between marital status, race, ethnicity, and cancer risk to better understand the underlying mechanisms driving the observed associations.

The takeaway

This large-scale study highlights the importance of considering marital status as a potential risk factor for cancer, particularly for certain cancer types. The findings suggest public health efforts should focus on identifying and supporting unmarried individuals to address disparities in cancer incidence.