Hearing Loss Education Center

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Hearing Loss Education Center
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Types and Causes of Hearing Loss

Review the information below to find out which hearing loss treatment may be right for you. 

Type

What’s wrong

Causes

Degree of hearing loss

Treatment Options

Conductive hearing loss
  • parts in the outer or middle ear (eardrum and 3 bones) are damaged or don’t work correctly
  • middle ear infections
  • head injury that damages middle ear bones 
  • birth defects
  • disease such as otosclerosis
  • ranges from mild to moderately-severe hearing loss
  • putting fingers in ears mimics conductive hearing loss (sounds from outside ear are softer; your own voice may sound louder)
  • often treated with medical intervention (tubes for middle ear infections)
  • depending on amount of hearing loss, may be treated with hearing aids or Baha® System
Sensorineural hearing loss
Also known as Nerve Deafness
  • parts in the inner ear (cochlea, auditory nerve system) don’t work correctly
  • heredity/genetics
  • too much loud noise
  • head injury
  • certain medications (damage inner ear hair cells)
  • diseases (measles, mumps, meningitis, Menieres)
  • normal aging process
  • birth defects

 

  • ranges from mild to profound degree of hearing loss
  • sounds are not only softer, but may seem muffled or garbled; harder to separate one sound from another and interpret meaning of speech and sounds
  • depending on amount of hearing loss, most often treated with hearing aids
  • moderate-to-profound hearing loss may be treated with cochlear implants
Mixed hearing loss
  • a combination of conductive and sensorineural hearing loss
  • a combination of damage in the outer or middle ear and in the inner ear (cochlea) or auditory nerve system
  • ranges from mild to profound degree of hearing loss
  • sounds can be both softer in volume and more difficult to understand (less clarity/more garbled)
Unilateral profound sensorineural  hearing loss
(single sided deafness)
  • no hearing or very little hearing in one ear(sensorineural hearing loss), the other ear functions normally or close to normal
  • sudden deafness (rapid hearing loss of unknown cause)
  • birth defects
  • tumors on the hearing nerve
  • head injury
  • diseases
  • profound hearing loss/deafness in one ear with normal hearing in the other ear 
  • plugging one ear somewhat mimics SSD
  • impaired ability to tell direction of sound


 



 
   

Hearing Loss

For hearing loss, refers to less than average ability to hear and understand sounds due to one or more parts of the hearing system not working properly.

Hearing Loss

For hearing loss, refers to problems hearing in both ears, not just one.

Hearing Loss

For hearing loss, refers to problems hearing in one, but not both ears

Mild Hearing Loss

People with mild hearing loss have some difficulty following speech, mainly in noisy situations; quietest sounds they can hear in their better ear average between 25 and 39 decibels (a standard measure of sound)

Moderate Hearing Loss

People with moderate hearing loss have difficulty following speech without a hearing aid; quietest sounds they can hear in their better ear average between 40 and 69 decibels (a standard measure of sound).

Severe Hearing Loss

People with severe hearing loss get help from powerful hearing aids, but often rely on lip-reading even when using an aid; quietest sounds they can hear in their better ear average between 70 and 89 decibels (a standard measure of sound).

Profound Hearing Loss

People with profound hearing loss mostly rely on lip-reading and/or sign language; the quietest sounds heard in their better ear average from 90 decibels or louder (a standard measure of sound).

Otosclerosis

A disease in which bone grows abnormally in the middle ear preventing structures within the ear from working properly and causing hearing loss.

Cochlea

Part of the ear that contains both the organ of hearing (the cochlea) and the organ of balance (the labyrinth).

Feedback

A high-pitched, sometime painful, whistling sound that occurs when a microphone picks up sound from a nearby speaker and replays it again and again (commonly occurs when a poorly fitting hearing aid earmold allows sound to “leak” from the speaker back into the microphone).

Assisstive Listening Devices

Electronic devices or accessories for hearing aids that provide extra help in specific listening situations (telephone, noisy backgrounds, small or large group settings, etc.).

Sensorineural Hearing Loss

Hearing loss due to failure of the auditory nerve, also called nerve deafness.

Mastoid Bone

A portion of the lower skull bone that contains the inner ear.

Rehabilitation

For individuals who previously experienced hearing and get a cochlear implant, the comprehensive training program that “re-teaches” them how to hear and interpret sounds, to recover any lost speech skills, and to properly use the cochlear implant speech processor and controls.

Habilitation

For individuals who had not previously experience hearing and get a cochlear implant, the comprehensive training program that teaches them to hear and interpret sounds, to develop or improve speech skills, and to properly use the cochlear implant speech processor and controls.

Coverage

For health insurance, coverage involves making sure a health plan or policy pays for the cochlear implant device and related professional services (for example, physician and audiology services). Usually, you go through a preauthorization process. This means getting a guarantee from the health insurance plan that they will pay for the implant and services before getting treatment.

Billing

For health insurance, billing involves the process by which health care providers charge, code, and submit their bills (in the form of a claim) to the health insurance company or plan.

Payment

For health insurance, payment involves getting the full amount allowed for services given a health plan’s limitations, allowables, deductibles, and co-payments.

Menieres

A disorder of the fluid volume of the inner ear that can cause hearing loss, dizziness/vertigo, tinnitus (ringing in the ear), and/or pressure or pain in ear.

Meningitis

a viral or bacterial infection that causes inflammation and swelling of the membranes covering the brain and spinal cord; among possible serious complications are hearing loss or deafness.

Mumps

a viral infection that causes swelling of the salivary glands; sometimes spreads to central nervous system which can result in hearing loss.

Measles

a viral infection that causes rash, fever, and cold-like symptoms; sometimes causes complications like ear or brain infections which can result in hearing loss.

Unilateral

on one side, but not the other; used to describe a type of hearing loss in which there is normal or somewhat impaired hearing in one ear and little or no hearing in the other ear.

Unilateral Hearing Loss

condition in which one ear has little or no hearing ability and the other ear has normal or close to normal hearing. Also referred to as Single Sided Deafness (SSD).

Osseointegration

the natural process of bone growing into the titanium fixtures creating a direct connection between an artificial implant and living bone.