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There are basically two types
of deafness. One is caused by problems with the sound
reaching the inner ear. Since the sound travels there via
conduction, this is called conductive hearing loss. It's the
far less common mechanism of hearing loss.
More common is sensor neural
hearing loss. This is often called nerve deafness, but this
is a mislead, because the auditory nerve is almost never the
cause. The problem is usually in the hair cells of the
cochlea. |
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Noise, induced hearing loss
can affect people of all ages and most often develops
gradually over many years. Over time, the noise experienced
at work, during recreation, or even common chores, can lead
to hearing loss.
Hearing loss may also occur as a result of disease,
infections or drugs. It may be inherited or be a result of
physical damage to the ears or serious injuries to the head. |
