There are probably a number of different causes of hyperacusis but researchers don’t really have a clear understanding of why some people have it. It is possible that some functions of the hearing system, which normally ‘balance’ sounds and protect the system, may be affected.
When you are in a noisy environment your brain sends 'information' about loud noise back to the inner ear, so that the 'volume' can be turned down and the inner ear can be protected. It is thought that damage to this feedback mechanism may be an underlying cause of hyperacusis.
Our brain also plays a vital role in processing the sound signals it receives from the inner ear. Problems in the way these signals are processed could be another cause of hyperacusis.We do know that some people first develop hyperacusis after sudden exposure to very high levels of sound or after a head injury. This may damage delicate structures within the inner ear, which could lead to hyperacusis.
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