Hearing loss is linked to dementia. Loneliness explains only a sliver.
People say: “Hearing loss may harm the brain by making people lonely” We read the study.
Cohort study. 317,108 people. mean first-to-last health-record follow-up 11.8 years; loneliness measured once (survey) with follow-up from the survey date.
People were watched for years. Nobody was told what to do. A clue, not proof.
Who: US adults in the All of Us volunteer cohort with >1 year of linked health records (mean age 44.2, SD 16.7); 16.0% had record-documented hearing loss; loneliness analyses in 130,266 with a scoreable UCLA-8 survey. Model Ns: hearing-dementia 208,608 (3,309 events); loneliness-dementia 86,387 (179 events)
- Hearing loss: dementia+38%linked, not proven
- Loneliness: dementiahigherself-reported
- Loneliness explains~2.5%of hearing link
More to know, from our read of the paper:
- Observational: linked, not proven. Authors explicitly say results 'should not be interpreted as evidence that hearing rehabilitation prevents dementia' -> no how-to (no hearing-aid advice)
- Hearing loss = diagnosis codes in health records, not validated against hearing tests; no severity, duration or hearing-aid data; mild/unrecorded hearing loss likely missed
- Mediation share for dementia (2.5%) was not statistically significant (p=0.081, CI -0.3% to 5.2%); for impaired cognition 2.0% was significant. Say 'about two to three percent' / 'a small slice', never 'loneliness plays no role'
- Covariates: age, sex, race/ethnicity, education, income, smoking, alcohol; comorbidities (e.g. depression, hypertension) deliberately not adjusted; residual confounding possible
- Volunteer cohort with EHR linkage requirements; mean age 44, so mostly mid-life at baseline; generalisability limited
Both linked. Loneliness explains little of the hearing link.
Researchers used health records from 317,108 US adults in the All of Us program, covering about 12 years on average. Hearing loss in the records was linked to 38% higher dementia risk, and feeling lonelier on a survey was linked to higher risk too. Loneliness explained only about 2.5% of the hearing loss link. Observational: linked, not proven, and the authors say it does not show that treating hearing loss prevents dementia.
Yang S, Sbarra DA, Wu J, Klimentidis YC (2026). Hearing loss and loneliness in the development of impaired cognition and dementia in the US All of Us cohort: prospective analyses using electronic health records. BMJ Public Health.
Design: Cohort study · observational cohort using linked electronic health records and a survey (NIH All of Us, Controlled Tier v8); adjusted Cox models plus four-way decomposition mediation; not preregistered, exploratory (linked, not proven)
DOI: 10.1136/bmjph-2025-004524
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