Hearing loss not only affects the ability to hear but may also be linked to an increased risk of dementia. Numerous studies have shown that people with hearing loss have a higher risk of cognitive decline.
Hearing is one of the vital senses that helps humans communicate, receive information, and maintain brain function. However, many studies in recent years have shown that hearing loss not only affects hearing ability but may also be linked to an increased risk of dementia.
Neurologists believe that early detection and treatment of hearing problems can play a crucial role in protecting brain health, especially in older adults.
Hearing loss is quite common
According to estimates from health organizations, more than 1.5 billion people worldwide are currently living with hearing loss to varying degrees.
This condition occurs when the ear's ability to perceive sound is impaired, making it difficult or impossible for the patient to hear low-intensity sounds.
Hearing loss can occur due to many causes, such as:
- Aging is a natural process.
- Prolonged exposure to noise.
- Chronic otitis media.
- Damage to the inner ear or the auditory nerve.
In older adults, age-related hearing loss (also known as presbycusis) is quite common, with about one-third of people aged 65 to 74 experiencing hearing problems.
Hearing loss in older adults can increase the risk of cognitive decline and dementia. (Illustration)
The connection between hearing and memory
Studies in the field of neurology show that hearing loss may increase the risk of cognitive decline and dementia.
A multi-year follow-up study at Johns Hopkins University found that people with mild hearing loss are twice as likely to develop dementia compared to those with normal hearing. Those with severe hearing loss are even five times more likely to be at risk.
Another analysis based on data from hundreds of thousands of people suggests that hearing loss may be linked to approximately 8% of dementia cases globally.
These findings have led many experts to view hearing loss as one of the modifiable risk factors for dementia.
Why can hearing loss affect the brain?
Scientists have put forward several hypotheses to explain the connection between these two conditions.
- The brain is "lacking stimulation".
When hearing ability decreases, the brain receives fewer auditory signals. This causes the brain regions involved in processing sound and language to become less active.
Over time, this lack of stimulation can reduce the activity of nerve cells, contributing to cognitive decline.
- The brain has to work too hard.
When hearing is impaired, the brain has to expend more energy trying to understand speech and surrounding sounds.
This causes the brain to expend more resources processing sound, reducing its ability to focus on other functions such as memorizing or thinking.
- Reduced social interaction
People with hearing loss often have difficulty communicating. This makes them more likely to avoid conversations or social activities.
Social isolation and limited interaction with others is a proven factor that can increase the risk of cognitive decline.
- Increased risk of depression
Hearing loss can cause people to feel insecure, stressed, or depressed. These psychological factors are also associated with an increased risk of dementia.
Hearing aids can help reduce the risk of dementia
The good news is that improving hearing ability can help reduce the risk of cognitive decline.
A study that followed more than 438,000 adults found that people with hearing loss who did not use hearing aids had a 42% higher risk of developing dementia compared to those with normal hearing.
Meanwhile, those who use hearing aids regularly do not experience a significant increase in risk.
These results suggest that treating hearing loss may help reduce the negative impact on brain health.
Regular hearing tests and the use of hearing aids can improve communication and protect brain health. (Illustration)
Signs of hearing loss to watch out for
Many people don't realize they are experiencing hearing loss because the condition often progresses slowly.
Some common signs include:
- I often have to ask others to repeat things.
- Difficulty hearing in noisy environments.
- Increase the volume on your TV or phone.
- I heard but didn't understand what was being said.
- Ringing in the ears or a feeling of blockage in the ears.
If these symptoms appear, patients should have their hearing checked for early evaluation.
What can be done to protect hearing and brain health?
Experts recommend several measures to help protect hearing and reduce the risk of cognitive decline:
Get your hearing checked regularly. Especially for people over 50 years old.
Avoid exposure to loud noises. Use ear protection when working in noisy environments.
Maintain a healthy lifestyle. Exercise, a balanced diet, and sufficient sleep help protect brain health.
Treat ear problems early. Ear infections or other ear conditions, if left untreated, can lead to hearing loss.
Use hearing aids when necessary. Hearing aids can help improve communication and reduce the burden on the brain.
Early detection to protect memory
Dementia is a progressive cognitive decline that affects memory, thinking ability, and daily activities.
Although not all cases of hearing loss lead to dementia, many studies show a strong link between the two conditions.
Therefore, experts advise against taking small changes in hearing ability lightly. Early hearing testing and treatment not only improves quality of life but can also contribute to long-term brain health protection.