Hearing Loss and Dementia

Untreated hearing loss is linked to higher dementia risk—and treating it may help protect thinking and memory.

Last reviewed: October 2026

Hearing loss is common with age—and research consistently links untreated hearing problems with a higher risk of dementia and faster cognitive decline. The good news: hearing loss is one of the most treatable of the modifiable dementia risk factors, and getting help may protect both your brain and your quality of life.

Hearing loss does not mean you will get dementia. It raises risk, just as smoking or high blood pressure do. Many people with hearing loss never develop dementia, and many other factors shape your outlook.

How strong is the link?

A landmark 2011 study of older adults found that the risk of dementia rose with the severity of hearing loss: roughly twice as high with mild loss, three times with moderate loss, and nearly five times with severe loss, compared with normal hearing. Later studies and reviews, including work highlighted by the Lancet Commission on dementia prevention, have reinforced hearing loss as a major midlife risk factor.

Researchers have proposed several explanations, which may all play a role:

Cognitive load – When hearing is poor, the brain works overtime to decode speech, leaving fewer resources for memory and thinking.
Brain structure – Hearing loss has been linked with faster shrinkage in areas involved in sound processing and memory.
Social isolation – Difficulty following conversations can pull people away from friends, family, and activities—another dementia risk factor (see Social Connection).
Shared pathways – In some cases, hearing changes and brain changes may share underlying causes, or hearing loss may be an early marker rather than a pure cause.

Can hearing aids help?

That is the practical question. The ACHIEVE trial, funded by the National Institute on Aging (NIA) and led by researchers at Johns Hopkins, tested hearing care in nearly 1,000 adults ages 70–84 with untreated hearing loss. Overall, hearing aids did not clearly slow cognitive decline across the full group. But in a higher-risk subgroup (people already enrolled in a heart-health study who were older and declining faster), hearing intervention slowed cognitive decline by nearly 50% over three years compared with a health-education control group.

NIA and other experts emphasize that hearing loss is treatable in later life and is an important public health target. Hearing aids will not reverse dementia, and they are not a guaranteed prevention tool—but for many people they improve communication, mood, and daily life, and they may protect thinking skills in those at higher risk.

Signs you may need a hearing check

Consider a hearing test if you:

Often ask people to repeat themselves
Turn up the TV louder than others prefer
Struggle in noisy restaurants or group conversations
Hear ringing, buzzing, or muffled speech
Avoid social events because listening is exhausting

Age-related hearing loss (presbycusis) usually comes on gradually. Family members often notice it before the person does. Sudden hearing loss in one or both ears is a medical emergency—seek care right away.

What you can do

Get screened. Ask your primary care doctor for a hearing check, or see an audiologist. Medicare and many plans cover testing; coverage for hearing aids varies.
Treat what's treatable. Wax, infection, or certain medications can affect hearing (see Reversible Causes of Memory Problems). Fixing those may help without aids.
Use hearing aids if prescribed. Modern devices are smaller and smarter than older ones. Over-the-counter hearing aids are available for mild to moderate loss in adults; an audiologist can help you choose.
Protect remaining hearing. Limit loud noise; use ear protection at concerts, with power tools, and in noisy workplaces.
Support conversation. Face the person, reduce background noise, speak clearly (not necessarily louder), and use captions on TV and video calls.

Caregivers and hearing

If someone you care for has dementia and hearing loss, communication can be doubly hard. Untreated hearing problems can look like confusion, withdrawal, or "not listening." Check hearing early; clean or replace batteries; and combine hearing aids with the communication strategies that work best for dementia—short sentences, calm tone, and one idea at a time.

Bottom line

Hearing loss is common, often overlooked, and clearly linked to dementia risk. Getting your hearing checked and treating problems when they appear is one of the most concrete steps you can take for brain health—alongside exercise, blood pressure control, and the other strategies in Reducing Dementia Risk: The 14 Risk Factors. Talk with a clinician about what is right for you; this page is general information, not personal medical advice.

Sources

Not medical advice. This article is general information, not a diagnosis or treatment plan for any individual. Talk with a doctor about your situation.

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