The surprising link between hearing loss and dementia

If you think hearing loss is “just” an old age problem, or only means you’ll ask people to repeat themselves, read on: not keeping your ears healthy might actually put your brain at risk, too.

Multiple studies have shown that folks with hearing loss have a higher risk of developing dementia compared to those with normal hearing. To get specific:

Older Americans with moderate or severe hearing loss were found to have a 61% higher prevalence of dementia compared to people with normal hearing.

Untreated hearing loss is now considered the single largest modifiable risk factor for dementia, according to the influential 2020 Lancet Commission on Dementia.

And—it’s not just about Alzheimer’s. Hearing loss is associated with all-cause dementia, not just one specific type.

How does hearing loss affect the brain?
Alright, so why does not hearing well mess with your memory and thinking? Here’s what the science from various research studies suggest:

Cognitive load: With hearing loss, your brain has to work a lot harder just to understand words. It ends up burning mental energy on listening, so less is available for memory, learning, and thinking. Over time, this “cognitive overload” might wear down the brain’s resources.

Brain changes: When the brain isn’t getting regular input from the ears, the areas responsible for processing sound can shrink or weaken, sort of like “use it or lose it.”

Social isolation: People with hearing loss often retreat from conversations and social activities. Loneliness and less mental stimulation create a perfect storm for dementia risk.

Biological effects: There’s some research showing other brain changes, like increased levels of proteins linked to Alzheimer’s, in people with age-related hearing loss.

What about hearing aids? Do they help?
Here’s the exciting part! Several major studies, including a nationwide trial funded by the NIH and led by Johns Hopkins, are showing that treating hearing loss may help lower dementia risk:

Hearing aid users with hearing loss had a 32% lower prevalence of dementia compared to non-users in a large national sample.

One big randomized trial (ACHIEVE) is tracking almost 1,000 older adults with hearing loss to see if those using hearing aids score better on memory and thinking over several years. Early results are promising and suggest that hearing aids could slow cognitive decline, especially in people with high dementia risk.

Should you worry about your ears?
If you’re thinking “I’m too young for this”—rethink that! The most important research shows that midlife hearing loss (not just in your 70s or 80s) is key. Catching and treating hearing loss early could make a huge difference for your brain down the road.

Tips for protecting both ears and mind
Get your hearing tested regularly, especially from age 50 and up.

Don’t ignore mild hearing loss. Even small changes matter over time.

Consider hearing aids or assistive devices if recommended, they’re not just for “old folks,” and using them might literally protect your brain.

Stay socially active even if you have hearing challenges, don’t let hearing struggles push you into isolation.

Keep your body and brain healthy: Treat other risk factors like high blood pressure, diabetes, and get plenty of exercise and mental stimulation.

Bottom line? Taking care of your hearing is actually a big part of taking care of your mind. If you or a loved one is struggling to hear, don’t brush it off—it’s not just about missing words, but about keeping your memory, mood, and mind sharp for years to come.