Diabetes May Cause Moderate-to-Severe Hearing Loss in One in Four Adults

One in four adults with type 2 diabetes could be living with moderate-to-severe hearing loss, according to findings highlighted by neurologist Dr. Sudhir Kumar in a recent post on X.

The warning comes as growing evidence suggests diabetes may affect the ears alongside the eyes, kidneys, nerves and heart, prompting doctors to urge early hearing checks.

Diabetes has long been linked to complications involving the eyes, kidneys, heart and nerves. Now, hearing loss is increasingly being recognised as another organ system that may be affected by persistently high blood sugar.

In a post shared on X this week, Dr. Sudhir Kumar, a Hyderabad-based neurologist, drew attention to new research showing that nearly one in four adults with type 2 diabetes has moderate-to-severe hearing loss and that people with diabetes have more than twice the odds of clinically significant hearing loss compared with those without the condition.

Sharing the findings, Dr. Kumar wrote that hearing loss may be "another microvascular complication of diabetes" and stressed that early detection can improve quality of life.

He advised people living with diabetes to maintain good blood sugar control, protect their ears from excessive noise, seek medical attention if they notice difficulty hearing conversations or find themselves increasing the television volume, and consider a formal hearing assessment, particularly if they have been living with diabetes for several years.

How diabetes may damage hearing

The connection between diabetes and hearing loss isn't entirely new, but researchers say the biological explanation is becoming clearer.

According to Dr. Kumar, persistently high blood sugar can damage the tiny blood vessels that supply the cochlea, the spiral-shaped organ in the inner ear responsible for converting sound into nerve signals.

Chronic inflammation and oxidative stress, both common in people with poorly controlled diabetes, are also believed to injure delicate hearing cells over time.

Unlike many other cells in the body, these sensory hair cells do not regenerate once damaged, making hearing loss difficult to reverse.

Research has pointed to the same trend for years

The latest findings add to a growing body of evidence linking diabetes with hearing impairment.

One of the largest studies on the subject, published in the Annals of Internal Medicine by researchers from the National Institute on Deafness and Other Communication Disorders, analysed data from more than 5,000 adults participating in the US National Health and Nutrition Examination Survey (NHANES).

The researchers found that hearing loss was about twice as common in adults with diabetes as in those without the condition, even after accounting for age and other risk factors.

Another 2023 systematic review and meta-analysis published in the journal Frontiers in Endocrinology found from multiple studies across different populations that adults with diabetes consistently faced a significantly higher risk of hearing impairment, reinforcing concerns that hearing should be considered another target organ affected by diabetes.

Together, the studies suggest the relationship extends beyond coincidence and may represent a genuine complication of long-term metabolic disease.

Why experts say early screening matters

Unlike blurred vision or numbness in the feet, hearing loss often develops gradually.

Many people don't notice the change until conversations become harder to follow or family members point out that the television volume has become unusually loud.

Doctors say that makes routine screening particularly important for people with long-standing diabetes.

While hearing loss cannot always be prevented, maintaining healthy blood sugar levels remains one of the best ways to reduce damage to small blood vessels throughout the body.

Avoiding prolonged exposure to loud noise and seeking medical advice at the earliest signs of hearing difficulty may also help preserve hearing and improve day-to-day communication.

As diabetes continues to rise worldwide, experts say awareness of lesser-known complications is becoming increasingly important.

Hearing may not be the first thing people think about after a diabetes diagnosis, but growing research suggests it deserves far more attention than it currently receives.