Summary: Hearing loss is widely acknowledged as a major modifiable risk factor for dementia, but whether hearing aids can reduce the risk of cognitive decline in the real world remains debated. A large retrospective analysis of electronic health records has now revealed a highly specific protective link: hearing aid use was associated with substantially lower dementia risk only in people living with both epilepsy and hearing loss, while no clear benefit was seen in several other high-risk groups.
Researchers analyzed anonymized records from more than 250 million patients in the international TriNetX network to test whether correcting peripheral hearing loss with hearing aids lowers dementia incidence. They compared adults with diagnosed hearing loss who used hearing aids to closely matched adults with hearing loss who did not, and then examined results in the overall hearing-loss population and in subgroups with common neurological, cardiovascular and metabolic conditions.
Key Facts
- Highly specific effect: A 23% lower dementia risk among people with both epilepsy and hearing loss was observed; this association was robust and reproducible within the study but was not present in other examined high-risk groups.
- Absolute impact and clinical meaning: Over five years the absolute risk reduction in the epilepsy subgroup was 2.7 percentage points. That corresponds to preventing one case of dementia for roughly every 37 people with epilepsy and hearing loss who use hearing aids.
- Cognitive reserve framework: Investigators propose a cognitive reserve model: people without major neurological injury typically have enough reserve to compensate for the extra effort of processing muffled sounds, but many people with epilepsy have reduced reserve, making them more vulnerable to additional sensory strain.
- Temporal lobe overlap: Temporal lobe epilepsy affects brain regions responsible for central auditory processing and memory, potentially compounding the effects of peripheral hearing impairment.
- Medication considerations: Some anti-seizure medications may have adverse effects on hearing, which could create a harmful cycle of treatment-related hearing decline and increased cortical strain.
- Clinical implications: Because people with epilepsy are already regularly followed in neurology clinics, routine, non-invasive hearing screening could be readily integrated into standard epilepsy care to detect and treat hearing loss early.
Source: European Academy of Neurology
Main finding: Among adults with both epilepsy and hearing loss, hearing aid use was associated with a 23% lower risk of developing dementia compared with those who did not use hearing aids, according to research presented at the European Academy of Neurology (EAN) Congress 2026.
The investigators from University Hospital Zurich and the University of Liverpool used TriNetX electronic health records to assemble matched cohorts of adults with diagnosed hearing loss who either did or did not use hearing aids. They performed subgroup analyses in people with epilepsy, stroke, type 2 diabetes, chronic kidney disease, heart failure, migraine and osteoarthritis to see whether hearing-aid benefit extended to other populations at elevated dementia risk.
Across the overall hearing-loss population and in most high-risk subgroups—including stroke, migraine, type 2 diabetes, chronic kidney disease, heart failure and osteoarthritis—no statistically significant association between hearing aid use and dementia risk was observed. The notable exception was the cohort living with both epilepsy and hearing loss, where hearing aid use correlated with a 23% lower incidence of dementia and an absolute five-year risk reduction of 2.7 percentage points.
Lead author Dr Carolina Ferreira-Atuesta said the team was surprised by the specificity of the result: “We expected small benefits across several high-risk groups, but instead the signal was concentrated in epilepsy. The consistency of the finding across multiple analyses increases our confidence that this is meaningful.”
The authors interpret the results through the lens of cognitive reserve—the capacity of brain networks to tolerate damage or age-related change while preserving function. In many people, that reserve buffers the additional processing load caused by hearing loss; in people with epilepsy, reserve is often already reduced due to recurrent seizures and structural damage, so removing the added burden of poor hearing may meaningfully lower dementia risk.
Epilepsy can accelerate cognitive decline, and when seizures originate in temporal lobes they directly affect regions tied to hearing, language and memory. The study also highlights that some anti-seizure medications have ototoxic potential, which could exacerbate hearing loss and further strain cortical processing.
Because epilepsy patients are typically engaged in ongoing neurology care, the research team recommends routine screening for hearing loss as part of standard epilepsy management. Detecting and treating hearing impairment with hearing aids is straightforward, low-risk and reversible—making it an attractive target for improving communication, mood and social engagement, in addition to any potential dementia-related benefits.
The investigators stress that the study is observational and cannot prove causation. Nonetheless, the association is biologically plausible and compelling enough to justify prospective studies to confirm whether hearing rehabilitation can protect long-term brain health in people with epilepsy and hearing loss.
Key Questions Answered:
A: The likely explanation is cognitive reserve. For many adults, the brain has sufficient reserve to absorb the extra effort of processing degraded sound, so restoring hearing may not change dementia risk substantially. In people with epilepsy, ongoing seizure activity and structural damage often reduce cognitive reserve. Treating hearing loss removes one additional source of daily cognitive strain, which may be enough to prevent crossing a threshold into functional dementia for some patients.
A: The temporal lobes are central to memory, language and auditory processing. Temporal lobe epilepsy damages these same networks, so hearing impairment and seizure-related injury can converge on overlapping brain regions. Additionally, some anti-seizure medications may harm inner-ear function, creating a potentially harmful cycle of worsening hearing and increased cortical strain.
A: The practical takeaway is to prioritize hearing assessment in epilepsy care. Hearing loss is detectable, treatable with low-risk interventions such as hearing aids, and addressing it improves communication, mood and social connectedness. Given the observed association with lower dementia risk in people with epilepsy, routine hearing screening and timely treatment represent sensible, low-cost actions that clinicians and patients can implement now while further research continues.
Editorial Notes:
- This article was edited by a Neuroscience News editor.
- The underlying journal paper was reviewed in full by the editorial team.
- Additional explanatory context was added by staff to clarify implications for clinicians and patients.
About this dementia and auditory neuroscience research news
Author: Luke Paskins
Source: European Academy of Neurology
Contact: Luke Paskins – European Academy of Neurology
Image credit: Neuroscience News
Original Research: Findings presented at the 12th Congress of the European Academy of Neurology