People who live by themselves are dying by suicide at more than double the rate of those who share a home, according to a massive new study that tracked nearly 600,000 Americans for two decades.
Quick Take
- A study of 598,023 U.S. adults found living alone raises the risk of death from many causes, not just one.
- Suicide showed the biggest jump, with risk more than doubling for adults 65 and older.
- Younger adults who live alone face higher risks of heart disease, diabetes, cancer and accidents.
- The number of Americans living alone has nearly quadrupled since 1940.
A Two-Decade Study Tracks Nearly 600,000 Americans
Researchers linked survey answers from the 1998 to 2018 National Health Interview Survey to the National Death Index, creating a picture of nearly 600,000 adults followed for about 22 years. The American Cancer Society released the findings, which compared people living alone against those sharing a household. The size and length of the study give the results real weight, since it covers two decades of real outcomes rather than a short snapshot.
The study split adults into two groups: ages 18 to 64 and 65 and older. For the younger group, living alone raised the risk of dying from any cause by 22 percent. For older adults, that risk rose by 6 percent. Both numbers point the same direction, but the gap shows age changes how much living alone matters for overall survival.
Suicide Risk Stands Out Above Every Other Cause
Suicide carried the strongest link to living alone in both age groups. Adults 18 to 64 who lived alone faced a 58 percent higher suicide risk. Adults 65 and older faced a risk more than double that of people living with others, at 103 percent higher. Researchers reported these numbers with statistical ranges that confirm the pattern is not a fluke of small sample size.
The study also found higher risk for other specific causes of death among younger adults living alone. Heart disease risk rose 41 percent, diabetes 34 percent, colorectal cancer 27 percent, stroke-related disease 23 percent, and accidents 17 percent. Older adults living alone also showed higher rates of death from hypertension, heart disease, and injuries, though the increases were generally smaller than in the younger group.
How This Fits a Larger Pattern of Research on Isolation
This study joins a long line of research connecting weak social ties to earlier death. A widely cited analysis of over 300,000 people found that stronger relationships came with a 50 percent better chance of survival over time. Separate reviews have linked loneliness, social isolation, and living alone each to higher mortality, even after accounting for other health factors.
Living alone, loneliness, and social isolation are related but not identical. A person can live alone and still have close daily contact with family or friends. Someone surrounded by people can still feel deeply isolated. The new study measured only household status, so it captures one piece of a larger social picture rather than loneliness itself.
More Americans Are Living Alone Than Ever Before
This research lands at a moment when solo living has become far more common. Census data show one-person households made up just 7.7 percent of all U.S. households in 1940. By 2020, that share had climbed past 27 percent, meaning more than a quarter of American homes now hold just one person.
Across 148 studies and 308,849 people, stronger social relationships went with a 50% increased likelihood of survival on average (OR 1.50, 95% CI 1.42 to 1.59, the paper's wording). The effect was largest for complex measures of social integration (OR 1.91, close to double) and… pic.twitter.com/TbdkQJ4PL7
— YapSpan (@yapspan) October 23, 2026
That shift matters for families and policymakers alike. As more older Americans age without a spouse or roommate in the house, the practical question becomes how communities, churches, and families check in on people who have no one under their own roof. Regular visits, phone calls, and community programs for people living alone are not just kindness; this data suggests they may be lifesaving.
What the Numbers Do Not Settle
The study shows a strong statistical link between living alone and higher death rates, but it does not prove living alone directly causes those deaths. Pre-existing illness, income, or mental health struggles could lead someone to live alone and also raise their mortality risk independently. The researchers measured association, and that distinction matters when weighing how much to act on these findings versus how much to study further.
Sources:
pressroom.cancer.org, diariodesalud.com.do, cancer.org
