Hearing Loss and Dementia: Does One Cause the Other? What Research Shows

You've probably seen headlines suggesting that hearing loss increases the risk of dementia or that hearing aids could help protect memory.

Some reports even describe hearing loss as one of the most important potentially modifiable risk factors for dementia.

But what does the scientific evidence actually show?

Researchers have consistently found an association between hearing loss and cognitive decline. However, an association does not necessarily mean that hearing loss causes dementia.

The distinction matters.

A major scientific review published in August 2026 confirmed that hearing loss is associated with higher rates of cognitive impairment and dementia across multiple research populations.

At the same time, randomized clinical trials investigating whether hearing interventions change cognitive outcomes have produced mixed findings.

This article examines the latest research, including the landmark ACHIEVE study, the September 2026 CHOICE trial, and recent scientific reviews.

The goal is to explain what researchers have established, what remains uncertain, and why headlines about hearing loss and dementia require careful interpretation.

Research reviewed October 23, 2026.

Is There a Link Between Hearing Loss and Dementia?

Yes. Multiple observational studies have identified a relationship between hearing loss and dementia.

A systematic review and meta-analysis published in Ageing Research Reviews in 2024 examined 50 cohort studies involving more than 1.5 million participants.

The researchers reported that adult-onset hearing loss was associated with a higher risk of subsequently developing dementia.

The pooled hazard ratio was 1.35, meaning that participants with hearing loss had approximately 35% higher relative hazard of dementia during follow-up compared with those without hearing loss, within the statistical models used.

The researchers also reported associations with mild cognitive impairment and Alzheimer's disease dementia.

These findings are important, but they do not establish that hearing loss directly causes those conditions.

Observational studies can identify relationships between characteristics and health outcomes, but other contributing factors may influence the results.

Source: Yu et al. (2024) — Adult-Onset Hearing Loss and Incident Cognitive Impairment and Dementia

What Did the Latest 2026 Review Find?

On August 24, 2026, researchers published an umbrella review in Frontiers in Aging Neuroscience.

An umbrella review combines evidence from existing systematic reviews and meta-analyses to examine how consistent the overall scientific findings are.

The researchers included nine previously published meta-analyses examining hearing loss and cognitive outcomes in adults.

Key findings

These results indicated statistically significant associations between hearing loss and the outcomes examined.

For dementia, the pooled odds ratio of 1.43 corresponds to approximately 43% higher odds in the statistical comparison.

That does not mean someone with hearing loss has a 43% chance of developing dementia.

An odds ratio is a relative measure, not an individual's absolute probability.

What were the limitations?

The authors identified several important limitations:

• Different studies used different hearing-loss measurements.
• Research populations varied in age and other characteristics.
• Definitions of cognitive impairment and dementia differed.
• Some primary studies appeared in more than one meta-analysis.
• Most underlying evidence was observational.
• Statistical heterogeneity was substantial.

The researchers therefore cautioned against drawing firm causal conclusions.

Source: Liang et al. (2026) — The Association Between Hearing Loss in Adults and Cognitive Outcomes: An Umbrella Review and Meta-Analysis

Does Hearing Loss Actually Cause Dementia?

This is where the evidence becomes more complicated.

The scientific community has not established that adult-onset hearing loss directly causes dementia.

Researchers have proposed several explanations for why the two conditions are associated.

Explanation 1: Increased listening effort

Understanding speech requires the brain to process incoming auditory information.

Some researchers hypothesize that hearing difficulties increase the cognitive effort required to understand conversations.

Under this hypothesis, greater listening demands might affect how cognitive resources are allocated.

However, the extent to which this proposed mechanism contributes to dementia risk has not been established.

Explanation 2: Reduced auditory stimulation

Another hypothesis suggests that long-term reductions in auditory input could influence brain structure or function.

Scientists have studied possible relationships between hearing loss, activity in auditory regions of the brain, and broader neural networks.

These findings do not prove that reduced auditory stimulation causes dementia.

Explanation 3: Social participation

Hearing difficulties can affect communication and participation in social activities.

Researchers have proposed that reduced social interaction could contribute indirectly to associations between hearing loss and cognitive outcomes.

However, social participation is influenced by many factors, and this proposed pathway remains incompletely understood.

Explanation 4: Shared underlying factors

Hearing loss and dementia may share certain risk factors.

For example, age and some cardiovascular or neurological processes may be relevant to both.

A shared factor could contribute to an observed association even without one condition directly causing the other.

Explanation 5: Changes in cognition may affect listening

The relationship may also work in the other direction in certain circumstances.

Cognitive abilities, including attention and processing speed, contribute to understanding speech.

Changes in these abilities may influence performance on some auditory tasks.

Researchers therefore consider the possibility that auditory and cognitive changes have complex, overlapping relationships.

Source: British Academy of Audiology, British Society of Audiology, and British Society of Hearing Aid Audiologists — Hearing Loss and Dementia Position Statement (2024)

What Was the ACHIEVE Study?

The Aging and Cognitive Health Evaluation in Elders (ACHIEVE) study was a major randomized clinical trial funded by the U.S. National Institutes of Health.

Its purpose was to investigate whether a hearing intervention could influence cognitive decline among older adults with hearing loss.

The trial included 977 participants aged 70–84 years.

Participants were randomly assigned to one of two groups:

• A hearing intervention involving hearing aids and audiological support.
• A health education comparison program.

Researchers followed participants for three years and measured changes in cognitive function using a battery of standardized tests.

The primary results were published in The Lancet in July 2023.

What did ACHIEVE find overall?

In the full study population, there was no statistically significant difference in three-year global cognitive decline between the two groups.

This was the trial's primary finding.

What happened in the higher-risk group?

The trial included two populations with different baseline characteristics.

One group consisted of participants already enrolled in the Atherosclerosis Risk in Communities (ARIC) research study.

These participants generally had more risk factors for cognitive decline.

In a prespecified subgroup analysis, researchers reported 48% slower cognitive decline over three years among ARIC participants assigned to the hearing intervention compared with the health education group.

No corresponding benefit was observed in the other study population, composed of healthier volunteers recruited from the community.

Why is the distinction important?

Some headlines describe the ACHIEVE trial as showing that hearing aids reduce dementia risk by 48%.

That is not what the trial established.

The 48% figure referred to the rate of cognitive decline in a particular higher-risk subgroup over three years.

It did not mean that 48% fewer participants developed dementia.

Furthermore, the overall randomized study did not find a statistically significant difference in its primary cognitive outcome.

The subgroup finding is important, but its interpretation requires caution.

Sources:

• Lin et al. (2023) — ACHIEVE Randomized Controlled Trial, The Lancet
• ACHIEVE Study — Official Research Findings
• British Academy of Audiology — Hearing Loss and Dementia

What Did the New September 2026 CHOICE Trial Find?

A more recent randomized clinical trial provides additional information.

On September 28, 2026, researchers published findings from the CHOICE randomized clinical trial in JAMA Neurology.

The study involved 703 older adults in China who had both moderate-to-severe hearing loss and mild cognitive impairment.

Participants were assigned to either a hearing aid intervention or a hearing care education comparison group.

The researchers followed participants for 24 months.

What was the main outcome?

The study examined progression from mild cognitive impairment to dementia-level impairment.

The reported rates were:

Although the numerical rate was lower in the hearing intervention group, the difference was not statistically significant.

The researchers therefore did not establish that the hearing intervention prevented progression to dementia-level impairment during the two-year study period.

Were there any other findings?

Yes.

A prespecified secondary analysis reported a higher proportion of participants showing improvement in cognitive classification within the hearing intervention group.

However, this secondary finding should not be confused with the primary outcome or interpreted as proof that hearing aids prevent dementia.

The study involved a specific population of older adults who already had mild cognitive impairment.

Its findings cannot automatically be generalized to all adults with hearing loss.

Source: Chen et al. (2026) — Hearing Intervention for Older Adults With Mild Cognitive Impairment: The CHOICE Randomized Clinical Trial

ACHIEVE vs. CHOICE: What Did the Two Trials Actually Show?

The studies examined related questions, but their participants, outcomes, and follow-up periods differed.

Both trials contribute important evidence.

Neither established that hearing aids universally prevent dementia.

Sources: ACHIEVE Trial and CHOICE Trial.

Do Hearing Aids Improve Memory?

This is a different question from whether hearing aids improve communication.

Cognitive functions include several domains, such as memory, attention, processing speed, and reasoning.

Researchers sometimes measure these outcomes separately.

What does the latest Cochrane review say?

On August 26, 2026, Cochrane published an updated systematic review examining hearing aids for adults with mild-to-moderate hearing loss.

The review included 16 studies involving 2,261 participants.

Researchers found evidence that hearing aids likely improve hearing-related quality of life and listening ability.

However, the evidence concerning working memory was considered very uncertain.

The authors did not establish that hearing aids reliably improve working memory.

This distinction is particularly important when interpreting promotional statements about hearing aids and brain health.

Hearing technology has documented communication-related benefits, but those benefits should not automatically be translated into claims about preventing dementia or restoring memory.

Source: Cochrane — Hearing Aids for Mild to Moderate Hearing Loss in Adults, Updated August 2026

What's the Difference Between Cognitive Decline, Mild Cognitive Impairment, and Dementia?

These terms frequently appear together in research articles, but they describe different concepts.

Not everyone who experiences age-related cognitive changes develops dementia.

Similarly, a reduction in performance on a cognitive test is not equivalent to a dementia diagnosis.

The U.S. National Institute on Aging explains that mild cognitive impairment can occur without progressing to Alzheimer's disease.

These distinctions are essential when reading research headlines.

For example, a study reporting slower cognitive decline is not necessarily showing fewer cases of Alzheimer's disease.

Source: National Institute on Aging — Memory, Forgetfulness, and Aging: What's Normal and What's Not?

Why Do Studies Sometimes Report Different Results?

Hearing loss and cognition research involves several methodological challenges.

Different study populations

A study involving healthy older volunteers may produce different results from a study involving participants who already have several risk factors for cognitive decline.

Different hearing-loss measures

Some studies use formal audiological tests.

Others rely on questionnaires or self-reported hearing difficulties.

These measurements are not necessarily interchangeable.

Different cognitive outcomes

Researchers may examine memory, attention, global cognitive performance, mild cognitive impairment, or diagnosed dementia.

These are related but distinct outcomes.

Different follow-up periods

A two-year study and a ten-year study may capture different patterns of cognitive change.

Confounding factors

Characteristics such as age, education, general health, and social circumstances may influence observed associations.

Overlapping research evidence

Umbrella reviews sometimes include multiple meta-analyses that share the same original studies.

Without accounting for overlap, evidence may appear more extensive than it actually is.

The August 2026 umbrella review explicitly examined several of these issues and cautioned that causal interpretations remain uncertain.

Source: Liang et al. (2026) — Frontiers in Aging Neuroscience

What Does the 2024 Lancet Commission Say?

The 2024 Lancet Commission on dementia prevention, intervention, and care identified hearing loss among 14 potentially modifiable risk factors for dementia.

The report discussed hearing loss in the context of population-level dementia prevention research.

It also reviewed evidence from the ACHIEVE randomized trial and observational studies examining hearing aid use.

However, the term potentially modifiable risk factor must be interpreted carefully.

It does not automatically mean that changing that factor has been proven to prevent dementia in every person.

The Commission's conclusions have also been the subject of scientific debate.

In November 2024, the British Academy of Audiology, British Society of Audiology, and British Society of Hearing Aid Audiologists published a joint position statement urging caution about claims that hearing loss causes dementia or that hearing aids directly prevent the condition.

Both perspectives recognize the association between hearing loss and cognitive outcomes.

The central disagreement concerns how confidently existing research can be interpreted as demonstrating causation or prevention.

Sources:

• The Lancet Commission — Dementia Prevention, Intervention, and Care (2024)
• British Academy of Audiology — Hearing Loss and Dementia Position Statement

What Has Research Actually Established About Hearing Aids?

The evidence can be separated into three questions.

Do hearing aids improve access to speech and communication?

Randomized-trial evidence summarized by Cochrane supports improvements in listening ability and hearing-related quality of life for adults with mild-to-moderate hearing loss.

Are hearing aids associated with better cognitive outcomes in some studies?

Yes. Some observational research and subgroup analyses have reported more favorable cognitive outcomes among hearing aid users or participants receiving hearing interventions.

Have hearing aids been proven to prevent dementia?

No. The randomized trial evidence discussed here has not established a general dementia-prevention effect.

These statements are consistent with the distinction between demonstrated communication benefits, observational associations, and unresolved causal questions.

Sources: Cochrane Review (2026), ACHIEVE Trial, and CHOICE Trial.

What Questions Are Researchers Still Trying to Answer?

Several questions remain open.

Does hearing loss contribute directly to dementia?

Research has established associations, but the precise causal relationship is not settled.

Do hearing interventions influence cognition differently across populations?

The ACHIEVE trial suggests that effects may vary according to baseline cognitive risk.

Further studies are required to clarify these differences.

Can hearing aids reduce the incidence of dementia?

Available randomized clinical trials have not established a general preventive effect.

Longer follow-up and additional research may provide clearer evidence.

How do hearing changes affect cognitive testing?

Research and professional guidance recognize that hearing difficulties can complicate spoken communication during some cognitive assessments.

What role does social engagement play?

Social participation has been proposed as one possible link between hearing difficulties and cognitive outcomes, but the direction and magnitude of this relationship remain uncertain.

Are particular cognitive abilities more closely associated with hearing loss?

Studies examine memory, processing speed, attention, and other domains.

Findings vary depending on study design and the tests used.

Sources: 2026 Umbrella Review and British Academy of Audiology Position Statement.

Frequently Asked Questions

Does hearing loss cause dementia?

Research consistently identifies an association between hearing loss and dementia, but a direct causal relationship has not been conclusively established.

Does everyone with hearing loss eventually develop dementia?

No. Hearing loss does not mean that a person will inevitably develop dementia. Population-level associations cannot predict an individual's outcome.

Does wearing hearing aids prevent Alzheimer's disease?

Current randomized clinical trial evidence has not established that hearing aids prevent Alzheimer's disease or dementia in the general population.

What did the ACHIEVE study find?

The ACHIEVE trial found no significant difference in its primary measure of cognitive decline across the overall study population after three years. A prespecified subgroup of participants at higher risk of cognitive decline showed slower decline with the hearing intervention.

Did ACHIEVE prove a 48% reduction in dementia risk?

No. The 48% figure referred to slower cognitive decline in a particular higher-risk subgroup, not a reduction in diagnosed dementia cases.

What did the 2026 CHOICE trial find?

The CHOICE trial found no statistically significant reduction in progression to dementia-level impairment over 24 months among older adults with mild cognitive impairment and hearing loss.

Are hearing loss and Alzheimer's disease the same thing?

No. Hearing loss is a sensory condition, while Alzheimer's disease is a neurodegenerative disease and a common cause of dementia.

Can hearing aids improve memory?

The August 2026 Cochrane review found very uncertain evidence regarding working memory, even though evidence for improvements in listening and hearing-related quality of life was stronger.

Why is hearing loss called a potentially modifiable dementia risk factor?

The term reflects a population-level association and the possibility that hearing-related interventions could influence relevant outcomes. It does not mean a dementia-prevention benefit has been conclusively established.

Has the connection between hearing loss and dementia become clearer in 2026?

Recent research has strengthened the evidence for an association and added new randomized trial findings. However, important questions about causation, prevention, and individual outcomes remain unresolved.

Final Thoughts: What Does the Evidence Really Say?

Research has established a consistent relationship between adult hearing loss and cognitive outcomes, including dementia.

The August 2026 umbrella review reinforced that association.

However, a statistical relationship is not the same as proof that hearing loss directly causes dementia.

The randomized ACHIEVE and CHOICE studies provide important experimental evidence, but neither established a universal dementia-prevention effect from hearing interventions.

Meanwhile, the updated 2026 Cochrane review supports communication-related benefits of hearing aids while finding substantial uncertainty about their effects on working memory.

The most accurate conclusion is that hearing loss and cognitive health are related areas of scientific research, but their precise causal relationship remains incompletely understood.

For readers exploring the subject, distinguishing established findings from proposed mechanisms and unproven claims is essential.

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Related reading:

10 Early Signs of Hearing Loss in Adults (and What to Do Next)

Sources and References

1. Liang, J., Yu, P., You, Q., & Yang, K. (2026). The Association Between Hearing Loss in Adults and Cognitive Outcomes: An Umbrella Review and Meta-Analysis. Frontiers in Aging Neuroscience, 18, 1852163. Published August 24, 2026.

2. Yu, R.-C., et al. (2024). Adult-Onset Hearing Loss and Incident Cognitive Impairment and Dementia: A Systematic Review and Meta-Analysis of Cohort Studies. Ageing Research Reviews, 98, 102346. DOI: 10.1016/j.arr.2024.102346.

3. Lin, F. R., et al. (2023). Hearing Intervention Versus Health Education Control to Reduce Cognitive Decline in Older Adults With Hearing Loss: The ACHIEVE Randomized Controlled Trial. The Lancet, 402, 786–797. DOI: 10.1016/S0140-6736(23)01406-X.

4. Chen, Y., et al. (2026). Hearing Intervention for Older Adults With Mild Cognitive Impairment: The CHOICE Randomized Clinical Trial. JAMA Neurology. Published September 28, 2026. DOI: 10.1001/jamaneurol.2026.3395.

5. Ferguson, M. A., et al. (2026). Hearing Aids for Mild to Moderate Hearing Loss in Adults. Cochrane Database of Systematic Reviews, Issue 8. Published August 26, 2026. DOI: 10.1002/14651858.CD012023.pub3.

6. Livingston, G., et al. (2024). Dementia Prevention, Intervention, and Care: 2024 Report of the Lancet Standing Commission. The Lancet. Published July 31, 2024.

7. British Academy of Audiology, British Society of Audiology & British Society of Hearing Aid Audiologists (2024). Hearing Loss and Dementia: Joint Position Statement and Practice Guidance. Published November 2024.

8. National Institute on Aging (NIA). Memory, Forgetfulness, and Aging: What's Normal and What's Not?. Definitions of cognitive aging, mild cognitive impairment, and dementia.

9. ACHIEVE Collaborative Research Group. ACHIEVE Study — Key Findings. Research explanations and published findings from the NIH-funded randomized trial.

Editorial disclosure

This article summarizes independently published scientific research, including systematic reviews, randomized clinical trials, and professional position statements.

Audiology Digital did not conduct these studies or independently collect patient data.

Research findings are attributed to their original authors. The article distinguishes observational associations, randomized trial outcomes, subgroup analyses, and hypotheses.

No claim is made that hearing loss causes dementia or that hearing aids prevent Alzheimer's disease.

Medical information disclaimer

This article is provided solely for general educational and research-information purposes. It does not offer medical advice, assess individual hearing or cognitive symptoms, provide diagnosis, recommend treatment, or predict dementia risk for any individual.

Scientific findings involving populations cannot be used to determine an individual's health status or future cognitive outcomes.