Untreated hearing loss increases dementia risk by up to 91% — and almost nobody acts on it

The 2020 Lancet Commission on Dementia Prevention identified 12 potentially modifiable risk factors accounting for approximately 40% of dementia cases worldwide. Hearing loss was assigned the largest single attributable fraction — 8% of all dementia cases — ahead of physical inactivity, social isolation, depression, and high blood pressure. A Johns Hopkins study tracking 639 adults over 18 years found that mild hearing loss doubled dementia risk, moderate hearing loss tripled it, and severe hearing loss increased it 4.9-fold.

The average adult with significant hearing loss waits 7 years before seeking assessment. Those 7 years represent preventable cognitive decline.

What to Do

• Annual hearing assessment from age 50, or earlier if there is tinnitus or difficulty in noisy environments
• Hearing protection in environments above 80 dB — consistent exposure above this level causes progressive sensorineural damage
• Hearing aids for clinical hearing loss — modern devices are discreet and highly effective
• Cardiovascular health management — arterial disease drives sensorineural hearing loss through cochlear ischaemia