The studies have found that seniors and elderly people who say that they have a hearing loss and do not use hearing aids are at a much higher risk of dementia and cognitive decline.
Some of the studies have also found that the use of hearing aids eliminated the increased risk of dementia. For people using hearing aids in the studies, there was no higher risk compared to people reporting no hearing loss.
Why this relationship?
Some researchers suggest that the reduced audiological input to the brain may contribute to cognitive decline and dementia. Others suggest that a common pathology may cause both conditions or that the strain of decoding sounds over the years may overwhelm the brains of people with hearing loss, leaving them more vulnerable to dementia.
Yet another theory is that hearing loss could lead to dementia by making individuals more socially isolated, a known risk factor for dementia and other cognitive disorders.