Adult children of aging parents bring this up more than anyone. They’ll come in with their mom or dad for the appointment, and at some point in the conversation, one of them will quietly ask, “Is it true that hearing loss can cause dementia? I read something.”
It’s a fair question. The headlines have been everywhere over the last several years. And the answer is more nuanced than the headlines usually let on. I want to walk through what we actually know, what we don’t, and what I tell my patients.
What the Lancet Commission actually said
The most influential report on this came from the Lancet Commission on dementia prevention. Every few years they publish an updated review of all the available evidence on what we know about preventing or delaying dementia. They identify the risk factors that appear to be modifiable — meaning things you can actually do something about, as opposed to things like genetics that you can’t.
In their most recent reports, hearing loss has consistently shown up at or near the top of the list. The estimate they’ve published is that midlife hearing loss accounts for roughly eight percent of dementia risk worldwide — a larger share than any other single modifiable risk factor in their analysis.
Two things to be careful about here.
The Commission says hearing loss is associated with higher dementia risk. They are careful not to say hearing loss causes dementia. Those are different claims. The research consistently shows the connection. The mechanism is still being studied.
The eight percent number is a population-level estimate of attributable risk. It doesn’t mean any individual person with hearing loss has an eight percent chance of dementia. It means, looking across all dementia cases worldwide, hearing loss appears to be a contributing factor in a meaningful fraction of them.
I get into this much detail because I never want to be the guy who scares somebody into a decision. I want you to make a decision with good information.
Why hearing loss might raise dementia risk
There are three leading explanations researchers have offered. Most likely it’s some combination of all three.
The first is cognitive load. When your ears aren’t sending up a clean signal, your brain has to work harder to process what little it’s getting. Over years, that constant extra workload may take resources away from other cognitive functions. The brain has a finite amount of attention, and if too much of it is going to “what did she just say,” there’s less available for memory, reasoning, and the higher-order thinking your brain depends on.
The second is social isolation. People with untreated hearing loss often pull back from conversations, family gatherings, and community life. They do this gradually, without realizing it. The trouble is that staying engaged with people is one of the most consistent protective factors against cognitive decline. So when hearing loss pulls you out of social life, it’s also pulling you away from one of the things keeping your brain sharp. I wrote more about this in the post on hearing loss and social isolation.
The third is direct neurological change. Some research suggests that the parts of the brain responsible for processing sound may shrink when they’re not used. The technical term is auditory deprivation. It’s the same general idea as a muscle atrophying when you stop using it.
None of these are settled science. But all three are biologically reasonable, and they fit the patterns we see in the research.
What’s less clear
Here’s the honest part most articles skip.
We don’t yet have a clean clinical trial showing that treating hearing loss with hearing aids reduces dementia risk. The ACHIEVE study, published a couple of years ago, was the first big randomized trial to look at this. It showed a meaningful benefit for older adults who were at higher risk for cognitive decline, but the effect across the full study population was more modest than some hoped.
What that tells me as a clinician is that hearing aids are probably part of the picture, especially for people who are already showing other risk factors, but they’re not a guaranteed shield against dementia. Nothing is.
So when somebody asks me, “Will getting hearing aids prevent dementia?” — I tell them no, that’s not a promise anyone can make. What I can tell them is that treating hearing loss appears to remove or reduce one of the most consistently identified contributors. It’s one of the few risk factors on the Lancet’s list that you can genuinely do something about with available technology today.
What this means at the kitchen table
If you’re an adult child wondering whether to push your mom or dad to get their hearing checked, here’s what I’d say. The dementia connection is one reason among several to take hearing loss seriously. The other reasons — staying connected with the people they love, staying safe on their feet, staying engaged with their life — are reasons enough on their own. The cognitive piece adds urgency, but it shouldn’t be the only frame.
If you’re the patient yourself — the person in your sixties or seventies who’s noticed your hearing isn’t what it was — the takeaway is the same. The cost of getting it evaluated is an hour of your time. The cost of waiting another five or ten years compounds across multiple dimensions of your health, of which dementia risk is one.
I’ve had patients come in already worried about cognitive changes. We treat the hearing loss, and a few months later they report sharper conversations, less mental fatigue, better follow-through on tasks. That’s not a cure for anything. But it’s the brain getting back some bandwidth it had been losing to translation work.
How we approach it in our clinic
When we work with a patient where cognitive concerns are part of the picture, we do a few specific things.
We slow down the evaluation. We make sure they understand each step. We invite a family member into the conversation if the patient wants them there.
We pay particular attention to speech-in-noise testing — how well someone can follow a conversation when there’s background sound. That’s often where the real-world difficulty is, and standard quiet-room audiograms can miss it.
We fit hearing aids with directional and noise management features tuned to the environments that matter most — family dinners, restaurants, church, doctor’s offices. This is part of what we mean by “Experience Hearing.” Adjusting for the booth isn’t the same as adjusting for life.
And we follow up. Three visits are built into a standard fitting at our clinic. If you’re working through cognitive concerns alongside hearing, you don’t want a one-and-done. You want someone who’s going to be there as the picture evolves.
A small first step
If any of this lands close to home — for you or for someone you love — getting a hearing evaluation is a low-stakes way to start the conversation. We don’t push. We explain what we find. You decide what to do.
We’ve been an independent hearing clinic in Asheville since 2014, with a second location in Hendersonville. I’m Brent Steele. Come Experience Hearing for yourself or call (828) 274-6913. For the bigger picture, explore the connections between hearing and overall health.
Knowing where you stand is the first move.