Hearing loss stands out as one of the most influential, modifiable risk factors for dementia—more so than smoking, hypertension, depression, or physical inactivity. Research indicates that compared to individuals with normal hearing, those with untreated hearing loss face increased dementia risk by approximately:
- 2× risk for mild hearing loss
- 3× risk for moderate hearing loss
- 5× risk for severe hearing loss
* It’s important to note that hearing loss doesn’t directly cause dementia, but the correlation is compelling and consistent across several studies.
There are three main theories about the possible mechanisms behind the link between untreated hearing loss and dementia. Each theory offers insight into how changes in hearing can ripple through the brain, affecting memory and thinking.
- Cognitive Load
When sounds are unclear, the brain works overtime to fill in the gaps. That extra effort takes energy away from memory and comprehension. Brain scans show that with hearing loss, thinking areas work harder to compensate for reduced activity in the part of the brain that processes sound. - Social Isolation
Hearing loss often leads people to withdraw from conversations and social activities. Less interaction means less mental stimulation, which can speed up cognitive decline. - Structural Changes
Studies using MRI scans have found that untreated hearing loss can lead to faster brain shrinkage, especially in areas that process sound. Over time, these regions reorganize in ways that aren’t always helpful for memory and thinking.
These explanations highlight why early intervention is critical, and recent research strongly supports this link. The 2023 ACHIEVE trial, designed to determine if treating hearing loss in older adults reduces the loss of thinking and memory abilities and other health outcomes, found that consistent use of hearing aids over three years reduced cognitive decline by 48% in older adults with mild to moderate untreated hearing loss and elevated dementia risk. While hearing aids do not reverse dementia, they can significantly slow progression in at-risk individuals.
Patients are sometimes misdiagnosed with early dementia when the real issue is untreated hearing loss. Symptoms of hearing loss, such as confusion, poor attention, and apparent memory issues, often mimic early dementia.Once appropriate amplification is provided, these symptoms can improve significantly, revealing “pseudo-dementia” due to untreated hearing issues.
Early intervention matters. Waiting until hearing loss is “bad enough” is outdated thinking, as delays can accelerate brain changes. Treating hearing loss early helps preserve neural pathways, improves speech understanding, and reduces isolation. Some research suggests that untreated hearing loss may speed up dementia by years, not just months.
Our ears detect sound, but the brain processes and understands it. When auditory input is unclear, the brain must work harder. This added strain over time can contribute to memory decline. Consistent hearing aid use acts like a workout for the auditory cortex, keeping neural pathways active and healthy.
Hearing loss isn’t just an inconvenience—it’s a health concern with significant implications for brain health. Hearing loss affects the brain, and addressing it is an important step in protecting your overall health.
Protect your hearing—and your brain health—with expert care from the JCMG Hearing & Balance Center. Our team specializes in comprehensive audiological evaluations for adolescents through older adults, offering personalized solutions to improve your quality of life. Call (573) 556-1732 to schedule your hearing evaluation today or visit JCMG.org/audiology to learn more.
By: Jamie Walker