Single Adults Face Elevated Cancer Risk, Study Reveals

New research has reported a broad link between never having married and a higher likelihood of developing cancer across most major cancer types. The findings were published in Cancer Research Communications on April 10, 2026 , based on an analysis led by the University of Miami .

The study reviewed cancer cases among over 4 million Americans across 12 states . It focused on cancers diagnosed at age 30 or older during 2015 to 2022 , and the researchers said they adjusted results for age, sex, and race . The authors reported that the elevated risk among never-married adults appeared especially strong for cancers described as preventable .

According to the study’s results, never-married men had a 70% higher probability of cancer than married men, while never-married women had an 85% higher risk than married women. For specific cancers, the researchers found never-married men had about five times the rate of anal cancer compared with married men. Never-married women had nearly three times the rate of cervical cancer compared with married women.

The researchers contrasted their work with earlier studies that have often focused on marital status and outcomes after a cancer diagnosis, such as survival. In this analysis, the reported association was tied to initial cancer development rather than post-diagnosis trajectories. The study did not present marriage as a direct protective factor, but instead highlighted marital status as a marker that may correlate with other influences on health.

Researchers said they suspect social factors commonly associated with marriage could help explain the differences observed in the data. They pointed to lifestyle patterns such as lower rates of smoking and drinking as examples of behaviors that may vary by marital status and could affect cancer risk.

The authors and outside experts emphasized that marriage itself does not prevent cancer , and that the findings should not be interpreted as a guarantee of protection for married people or inevitability of illness for unmarried people.

What remains uncertain is how much of the measured gap is driven by unobserved factors not detailed in the study summary, including differences in screening uptake, healthcare access, or other social and behavioral variables. Even so, experts said the results underscore a practical message: people who are unmarried should be especially attentive to managing cancer risk factors and keeping up with regular health screenings .