Hearing loss and dementia are more connected than most people realize. In 2024, a major international commission published in The Lancet named hearing loss as one of the two largest modifiable risk factors for dementia, alongside high LDL cholesterol. Two in three Americans over 70 have some hearing loss, yet many never get it checked. The hopeful part is that hearing is one of the most addressable risk factors on the list.
Quick Answer
- Hearing loss is one of the two largest modifiable risk factors for dementia.
- Two in three Americans over 70 have some hearing loss.
- In the ACHIEVE trial, hearing care slowed thinking decline by about half in higher-risk adults.
- Get a baseline hearing test around 50 and use hearing aids if recommended.
This guide covers what the research shows about hearing and brain health, why the link may exist, whether hearing aids help, and simple steps to protect your hearing.
How Common Is Hearing Loss?
Hearing loss becomes more common with age. A U.S. analysis found that about two in three adults aged 70 and older have hearing loss, and the numbers rise sharply after 60 (Goman and Lin, Am J Public Health, 2016). Because it develops gradually, many people adapt without noticing, and on average adults wait years before seeking help.
What the Research Shows About Hearing Loss and Dementia
1. Hearing loss ranked among the top modifiable risk factors
The 2024 Lancet Commission on dementia reviewed global evidence and identified 14 modifiable risk factors that together may account for nearly half of dementia cases. Hearing loss and high LDL cholesterol in midlife each accounted for about 7% of cases, the largest share of any single factor (Livingston et al., Lancet, 2024). The commission recommended making hearing aids accessible to everyone who needs them.
2. Hearing care slowed decline in higher-risk adults
The ACHIEVE trial randomly assigned 977 adults aged 70 to 84 with untreated hearing loss to either a hearing intervention, including hearing aids and counseling, or a health education program. Over three years, there was no significant difference in cognitive decline in the full group. But among participants from a long-running heart study who had more risk factors for dementia, hearing care slowed cognitive decline by about 48% (Lin et al., Lancet, 2023).
Why Might Hearing Loss Affect the Brain?
Researchers are still working out the mechanisms, but three explanations have the most support:
- Cognitive load: when sound is unclear, the brain works harder to decode speech, which may divert resources from memory and thinking.
- Social isolation: struggling to hear can make conversations tiring, leading people to withdraw. Loneliness and low social engagement are themselves dementia risk factors.
- Brain changes: reduced input from the ears has been linked with faster shrinkage in brain regions involved in processing sound and memory.
Chronic stress may also play a role. Straining to follow conversations all day can be exhausting, and ongoing stress affects sleep, mood and the brain.
What researchers are exploring next
Most evidence linking hearing loss and dementia is observational, which means other factors could explain part of the connection. The ACHIEVE trial did not show a benefit in its full population, only in a higher-risk subgroup. Hearing aids are not a guaranteed way to prevent dementia, but treating hearing loss clearly improves communication and quality of life, which are worthwhile on their own.
Signs You May Have Hearing Loss
- Often asking people to repeat themselves
- Trouble following conversations in noisy places like restaurants
- Turning up the TV or phone volume more than others prefer
- Feeling tired or stressed after social gatherings
- Ringing in the ears (tinnitus)
5 Simple Steps to Protect Your Hearing and Brain
- Get a hearing test. A baseline check around age 50, or sooner if you notice changes, gives you something to compare against.
- Use hearing aids if recommended. Over-the-counter hearing aids are now available in the U.S. for mild to moderate loss.
- Protect your ears from loud noise. Use earplugs at concerts, with power tools, or in loud workplaces.
- Stay socially connected. Regular conversation and group activities keep the brain engaged.
- Manage stress and sleep. Simple tools like cyclic sighing and a steady sleep schedule support brain health.
Curious which brain and body signals to prioritize? Take the free Signal Map quiz. High LDL cholesterol shares the top spot with hearing loss, and our guide to the ApoB test explains a better way to measure it.
Frequently Asked Questions
Does hearing loss cause dementia?
Hearing loss is linked with a higher risk of dementia, and the 2024 Lancet Commission ranked it among the largest modifiable risk factors in midlife. Researchers are actively studying how hearing loss and dementia are connected, with several strong pathways in focus, including extra strain on the brain, social isolation, and changes in brain structure.
Can hearing aids lower dementia risk?
Evidence is encouraging but not final. In the ACHIEVE trial, hearing care slowed thinking decline by about half in older adults at higher risk, though not in the overall group. Treating hearing loss clearly improves communication and quality of life, and the 2024 Lancet Commission recommends hearing aids for everyone who needs them.
How often should I get a hearing test?
Many experts suggest a baseline hearing test around age 50 and then every few years, or sooner if you notice trouble following conversations, turning up the TV, or asking people to repeat themselves. Ask your clinician or an audiologist.
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Sources
- Livingston G, et al. Dementia prevention, intervention, and care: 2024 report of the Lancet standing Commission. Lancet. 2024;404(10452):572-628. doi:10.1016/S0140-6736(24)01296-0
- Lin FR, et al. Hearing intervention versus health education control to reduce cognitive decline in older adults with hearing loss in the USA (ACHIEVE): a multicentre, randomised controlled trial. Lancet. 2023;402(10404):786-797. doi:10.1016/S0140-6736(23)01406-X
- Goman AM, Lin FR. Prevalence of hearing loss by severity in the United States. Am J Public Health. 2016;106(10):1820-1822. doi:10.2105/AJPH.2016.303299
This article is for education only and is not medical advice. Talk with your healthcare professional before changing your health routine.