A randomized trial published Sept. 28 in JAMA Neurology found that giving hearing aids to older adults with mild cognitive impairment and hearing loss did not significantly reduce the rate of dementia-level impairment after 24 months. The study was led by researchers at Shanghai Ninth People's Hospital, part of Shanghai Jiao Tong University School of Medicine in China.
For adult children who have spent months urging a parent to get a hearing test, that result may sound like a reason to drop the subject. The broader evidence says otherwise. The trial asked whether hearing aids prevent dementia in people whose memory is already slipping. It was not designed to answer whether they help someone hear family at dinner, follow a doctor's instructions, or stay socially connected.
That difference matters for many U.S. households. The FDA estimates that close to 30 million U.S. adults have some degree of hearing loss, and only about one in five who could benefit from a hearing aid seeks help.
A Narrow Question About Memory, Not Hearing
The JAMA Network summary states the main result plainly: among older adults with mild cognitive impairment and coexisting hearing loss, the hearing aid intervention did not significantly lower the incidence of dementia-level impairment at two years. Mild cognitive impairment describes memory or thinking problems that are noticeable but do not yet take away daily independence.
The summary did not list how many people took part. The same Shanghai team previously published the design of a multicenter randomized trial comparing hearing aid fitting with health education in older adults with hearing loss and mild cognitive impairment, with checkups at 6, 12, and 24 months. A 2025 baseline report from that project described 703 enrolled participants with moderate to severe hearing loss and an average age of about 75. MedicalDaily has not yet confirmed that the new results come from that same group.
A randomized design is the strongest way to test cause and effect, but this one had clear limits. Participants already had cognitive decline when they enrolled, follow-up lasted two years, and the study took place in China, so results may not apply to U.S. patients with milder hearing loss or longer device use. The published summary reports only the dementia outcome, not hearing, mood, or quality of life.
An accompanying editorial by Justin Golub, an otolaryngologist at Columbia University, appeared the same day in JAMA Otolaryngology-Head & Neck Surgery.
Benefits That Showed Up in Earlier Research
The largest U.S. trial on this question, called ACHIEVE, reached a similar overall conclusion in 2023. Among 977 adults aged 70 to 84 with untreated hearing loss, three-year cognitive change did not differ significantly overall between people who received hearing care and those who received health education. In a subgroup already at higher risk of decline, the hearing intervention slowed the loss of thinking and memory skills by 48% over three years, though subgroup findings are less certain than a trial's main result.
The same trial found gains families can see day to day. "In both the ARIC group and the new group of community volunteers, we also found that the hearing intervention improved communication abilities, social functioning and loneliness," Frank Lin, a Johns Hopkins researcher who co-led the trial, said in a 2023 release from UNC's Gillings School.
A later ACHIEVE analysis led by NYU Langone Health, summarized by ScienceDaily, found that participants treated for hearing loss kept about one more social connection on average over three years than those who received only healthy-aging education.
Those are not dementia-prevention effects. They are quality-of-life effects, and they are usually the ones families notice first.
Starting the Conversation with an Aging Parent
Many older adults resist hearing aids because of cost, stigma, or the belief that their hearing is fine. Pointing to specific moments tends to work better than raising fears about memory. A parent who keeps missing phone calls, turns the TV up loudly, or nods through medical appointments without catching instructions has a concrete reason to get tested.
Adult children should avoid promising that hearing aids will prevent dementia. Taken together, the Shanghai trial and ACHIEVE suggest any cognitive effect is modest or limited to certain groups. A more honest pitch is that better hearing can make conversations easier, reduce isolation, and keep a parent involved in family life.
A hearing evaluation with an audiologist or primary care clinician is a sensible first step. The FDA advises seeing a doctor before buying a device if hearing changed suddenly, one ear is worse, there is ear pain or drainage, or there is dizziness or ringing in only one ear.
Cost and Coverage Can Shape the Decision
Price remains a major barrier. Since October 2022, the FDA has allowed over-the-counter hearing aids for adults 18 and older with perceived mild to moderate hearing loss, sold without an exam or prescription. Prescription devices fitted by a professional remain the option for more severe loss. Over-the-counter models can lower the upfront cost, but they put more of the setup work on the user, which can be harder for a parent with memory problems.
Original Medicare does not cover hearing aids or exams for fitting them, according to Medicare's hearing aid coverage page, though some Medicare Advantage plans offer hearing benefits. Families should check a parent's plan, ask about trial periods and return policies, and plan for follow-up adjustments, which often decide whether a device actually gets worn.
The full JAMA Neurology paper may clarify secondary results such as hearing, mood, and daily function. Until then, the evidence supports treating hearing loss for what it reliably does: helping people hear the people around them.
Key Questions Answered
What did the new trial find?
Hearing aids did not significantly reduce dementia-level impairment after two years in older adults who already had mild cognitive impairment and hearing loss.
Does this mean hearing aids are useless?
No. Earlier research found hearing care improved communication, social functioning, and loneliness, even when overall cognitive results were mixed.
Should my parent stop wearing hearing aids?
The trial gives no reason to stop. Its published summary did not report hearing or quality-of-life outcomes, which are the main reasons devices are recommended.
Who can use over-the-counter hearing aids?
Adults 18 and older with perceived mild to moderate hearing loss. More severe loss calls for a professional evaluation and fitting.
Does Medicare pay for hearing aids?
Original Medicare does not. Some Medicare Advantage plans include hearing benefits, so families should check plan details.
When should hearing loss be checked by a doctor first?
Sudden hearing changes, hearing loss in one ear, ear pain or drainage, dizziness, or ringing in one ear should be evaluated before buying a device.
Published by Medicaldaily.com
