Marriage, it turns out, may come with a side‑effect no one puts in the vows: people who have been married seem less likely to develop cancer than those who have never married at all.

That is the provocative finding from a large new study that has raised interesting questions about what really keeps us healthy over a lifetime. If marriage shows up in the data as “protective”, is it love that matters, the piece of paper, or something much bigger hiding in the background?

In this analysis, researchers looked at cancer diagnoses in more than 4 million adults across 12 US states, representing a population of over 100 million people. They focused on cancers diagnosed after the age of 30 between 2015 and 2022 – a modern snapshot taken in an era when same‑sex marriage is legal nationwide, so marriage includes more people than ever.

Everyone was divided into two camps: those who were or had ever been married, including divorced and widowed people, and those who had never married at all. Around one in five adults landed in this never‑married group, a sizeable minority whose health has often been overlooked in traditional family‑centred research.

When the researchers compared the numbers, the gap was impossible to ignore. Men who had never married were about 70% more likely to develop cancer than men who had married at some point, while women who had never married were about 85% more likely to develop cancer than women who were or had been married.

More advantage to women

That last figure is especially notable, because many earlier studies suggested that men gained more from........

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