What are the causes for hearing loss (mialin damage, nerve damage, cochlea damage...) and what percentage each of the causes represent within the hearing impaired population ?
This is a huge subject , and the following site gives you the main causes:
http://www.who.int/mediacentre/factsheets/fs300/en/
I will rephrase my question:
What are the causes for hearing loss from the anatomical-physiological point of view? Is severe hearing loss caused mostly from cochlea damage or is it the cranial nerve VIII which is damaged - which is the main factor?
Most of the causes for deafness are damaged hair-cells or cranial nerve VIII (from a genetic effect, noise or diseases like measles, mumps, HIV...) - the disconnection is in the nerves, and small percentage in a myelin damage.
Hearing problems may happen by birth,through generation .Or listening sound as loud .Using unnecessary things like strong ear buds like sticks may cause hearing problem.Fault drugs also be a reason for hearing problem.I had hearing problem by listening mp3 loud ,Then I took advice from http://www.adviceonhearingaids.com/ It's cured now.I got a best advice from them
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