Hearing loss identified as top modifiable dementia risk factor in Japan

Recent research has identified hearing loss as the leading modifiable risk factor for dementia in Japan. According to a 2026 study, addressing hearing loss could theoretically reduce the overall dementia population by 6.7%. This is followed by physical inactivity at 6.0% and cholesterol issues at 4.5%.

Medical experts note that hearing loss often begins with a decline in high-frequency perception during middle age, even if significant difficulty in conversation does not manifest until after age 65. The condition is primarily caused by damage to the hair cells in the cochlea or the auditory nerves connecting the ear to the brain.

To mitigate risks, health officials recommend early detection through regular testing and lifestyle adjustments. The World Health Organization suggests limiting earphone volume to 60% of maximum capacity and taking breaks from loud environments to prevent permanent noise-induced hearing loss.