Widowhood → Dementia
Higher widowhood increases dementia.
A meta-analysis of observational studies found widowed people at higher risk of dementia than married people, with a relative risk of 1.20 (1.02 to 1.41).
Meta-analysis · Moderate · N=15
The two move together in observational data. Nobody has yet tested whether one causes the other.
Mechanism
The meta-analysis does not name a pathway from widowhood to dementia.
Caveats
These are observational studies, so the result is a link and not a cause. The lower end of the range, 1.02, sits close to no difference. Lifelong single people had a higher relative risk still, 1.42 (1.07 to 1.90), in the same review. The studies do not separate what else differs between married and widowed people.
Effect
Risk ratio 1.2 (95% CI 1.02 to 1.41). Widowed people had a relative risk of dementia of 1.20 (1.02 to 1.41) compared with married people.
Nodes
Named confounders
Cite this page
What Causes What. “Widowhood → Dementia.” https://whatcauseswhat.org/edges/e-widowhood-dementia (atlas updated 2026-10-18).
Papers
- Marriage and risk of dementia: systematic review and meta-analysis of observational studies.
A Sommerlad, J Ruegger, A Singh-Manoux, G Lewis, G Livingston · 2019 · Journal of neurology, neurosurgery, and psychiatry
adults compared with married people, 15 studies · Risk ratio 1.2 (95% CI 1.02 to 1.41)