Mid-Frequency Sensorineural Hearing Loss
You may not have heard of cookie-bite hearing loss, and for good reason. It’s extremely rare, affecting just .7% of people.*
Formally known as mid-frequency sensorineural hearing loss (MFSNHL), cookie-bite loss can be challenging to manage, but better hearing is possible with the right hearing care.
When you have a hearing test, your results appear on a graph called an audiogram. This graph shows the frequencies where you have trouble hearing.
Cookie-bite hearing loss appears U-shaped on an audiogram, as if someone took a bite out of it. This is because mid-frequencies drop while low and high frequencies remain stable.
Cookie-bite hearing loss impacts mid-range frequencies and is typically sensorineural, which means there is permanent nerve damage in the inner ear. You can also have sensorineural hearing loss with high- or low-frequency loss.
High-frequency hearing loss makes it tough to hear higher pitches like birds chirping or children's voices, while low-frequency loss makes it hard to hear deep tones like truck engines.
Outside of sensorineural, there is conductive hearing loss, which is not permanent. It stems from blockages in the outer or middle ear, such as ear wax or a structural issue.
Understanding Root Causes
Genetic and hereditary factors
Cookie-bite hearing loss is frequently passed down through families. If your parents or grandparents experienced mid-range hearing drops, you may be more likely to inherit it.
Inner ear or cochlear changes
The tiny hair cells inside the cochlea are responsible for processing mid-frequency sounds. When these specific cells fail to transmit signals properly to the brain, a mid-range dip occurs.
Other possible contributing factors
Though less common than genetics, aging, prolonged noise exposure, underlying medical conditions, or certain medications can possibly contribute to mid-range hearing loss.
As with any form of hearing loss, progression varies from person to person.
For some, the dip remains stable over a lifetime. For others, the U-shape may gradually deepen or widen over time, making regular hearing checks is very important.
The Impact on Daily Well-Being
Diagnosing Cookie-Bite Hearing Loss
Hearing tests and audiograms
Your hearing specialist will conduct your hearing test, which usually takes about an hour. Cookie-bite hearing loss will be diagnosed if the audiogram (the graph of test results) shows the “dip” (or “bite”) in mid-frequency hearing.
Proper diagnosis
A proper diagnosis is key to hearing your best. Working with a licensed hearing care specialist is important for proper testing, diagnosis of hearing loss type and causes, and treatment.
A hearing specialist will ask questions about your family history, symptoms, noise exposure, medical history, and communication challenges. They’ll help to ensure you’re using the right solutions for your type of hearing loss and protecting your remaining hearing ability as well.
Provide or refer you for additional medical screening
If your specialist notices sudden, one-sided, or rapidly changing hearing loss, they'll refer you to an ear, nose, and throat (ENT) physician or other medical professional for additional screening.
How to Manage Cookie Bite Hearing Loss
While classified medically as an impairment, cookie-bite or any form of hearing loss may qualify as a legally recognized disability. This depends on the severity of the hearing loss, and how significantly it impacts your daily communication and work.
Talk with your hearing care provider or the Social Security Administration if you believe your hearing loss may be a disability.
FAQs
Sources:
*National library of medicine: Characteristics of Mid-Frequency Sensorineural Hearing Loss Progression (April 12, 2021): pmc.ncbi.nlm.nih.gov.