Research Suggests Dementia May Spread in Marital Relationships

WHO:

StudyFinds - Researchers from Taiwan conducted the study.

StudyFinds - The study involved nearly a million married people.

WHAT:

StudyFinds - When one spouse is diagnosed with dementia, the other partner’s risk of developing it runs about 70 percent higher.

StudyFinds - The risk is approximately 74 percent for wives and 69 percent for husbands.

StudyFinds - The study included 955,105 people matched by birth year, sex, income, and location.

StudyFinds - Among women whose husbands had dementia, the risk of developing it themselves was 74 percent higher than in the comparison group.

StudyFinds - Among men whose wives had dementia, the risk was 69 percent higher.

StudyFinds - The five-year risk of developing dementia for women with an affected spouse was about 6.5 percent compared to 3.7 percent for those without.

StudyFinds - For men, the five-year risk was about 9.2 percent versus 5.75 percent.

WHERE:

StudyFinds - The study utilized Taiwan’s National Health Insurance Research Database.

WHEN:

StudyFinds - The study analyzed records from 1998 to 2022.

StudyFinds - The findings were published in JAMA Network Open in July 2026.

WHY:

StudyFinds - Shared homes, similar lifelong diets and habits, and the strain of caregiving contribute to the increased risk of dementia.

StudyFinds - Spouses with lower incomes and fewer children faced the widest gaps in absolute risk due to less caregiving support.

HOW:

StudyFinds - Researchers tracked dementia risk across couples using a nationwide health database.

StudyFinds - The study compared spouses of people newly diagnosed with dementia to a matched group whose partners had no such diagnosis.

(UPDATED July 21, 2026 22:23 UTC)

Researchers from Taiwan have found that when one spouse is diagnosed with dementia, the other partner’s risk of developing the condition increases significantly, running about 70 percent higher overall. The study, which analyzed records from nearly a million married individuals, revealed that the risk is approximately 74 percent for wives and 69 percent for husbands, with the five-year risk for women with an affected spouse at about 6.5 percent compared to 3.7 percent for those without. The findings, published in JAMA Network Open in July 2026, suggest that shared living environments, similar diets, and caregiving strain contribute to this increased risk, particularly among spouses with lower incomes and fewer children who may lack adequate support.