Does Marriage Lower Cancer Risk? What the Research Says

A study conducted by the Sylvester Comprehensive Cancer Center, part of the University of Miami Miller School of Medicine, has found that adults who have never been married have a significantly higher likelihood of developing cancer compared to those who have been married.

The research, published in Cancer Research Communications, analyzed data from approximately four million U.S. Cancer cases diagnosed between 2015 and 2022. The study focused on adults aged 30 and older, comparing individuals who had never married against those who had ever been married, a group that included people who were currently married, divorced, separated, or widowed.

The findings revealed a stark difference in cancer risk based on marital status. Never-married men were found to have about a 68 percent higher likelihood of developing cancer than their ever-married peers. Never-married women faced an even higher disparity, with about an 83 percent higher likelihood of developing cancer.

Marital Status as a Risk Marker

Researchers emphasized that these results do not indicate that the act of marriage itself prevents cancer. Instead, they suggest that marital status serves as a strong population-level marker for other underlying risk factors.

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The main takeaway is that marital status appears to be a strong marker of cancer risk at the population level.

Paulo Pinheiro, MD, PhD, coauthor of the study and cancer epidemiologist at Sylvester Comprehensive Cancer Center

Dr. Pinheiro noted that the trend reflects how differences in lifestyle, health habits, and risk factors can accumulate over time. The study included same-sex marriages beginning in 2015, although the population data used did not allow researchers to distinguish between different types of partnerships.

The Role of Social and Behavioral Factors

Public health experts suggest that the lower risk observed in ever-married adults may be linked to social support systems and healthcare-seeking behaviors. Partners often play a critical role in monitoring a spouse’s health, noticing new symptoms, and encouraging them to visit a doctor.

According to psychiatrist Dr. Kersi Chavda, marital status often acts as a proxy for several interconnected factors, including financial stability, access to healthcare, and behavioral patterns. Married individuals may be more likely to follow treatment protocols, attend regular check-ups, and detect illnesses in earlier, more treatable stages.

Because many factors linked to higher cancer risk are modifiable, the researchers suggest that the gap in cancer rates is not an inevitable result of being unmarried but rather a reflection of these social and behavioral differences.

Implications for Cancer Prevention

The study’s authors clarify that the findings are not a prescription for people to get married to avoid illness. Instead, the data highlights the need for targeted prevention and awareness strategies for those without a partner.

It means that if you’re not married, Try to be paying extra attention to cancer risk factors, getting any screenings you may need and staying up to date on health care.

Frank Penedo, PhD, associate director for population sciences at Sylvester Comprehensive Cancer Center

Dr. Penedo noted that the findings point to the importance of tailoring cancer risk awareness to account for marital status. As the prevalence of marriage decreases in the United States, researchers believe this social factor warrants further study to better understand how to support the health of unmarried populations.

While marriage is already associated with better survival rates and earlier diagnoses, this study is among the first to specifically examine marriage as a protective factor regarding the initial risk of developing cancer.