Loud music played on earphones causes deafness by having a similar effect on nerves as multiple sclerosis (MS), scientists have learned.
New research shows that noise above 110 decibels strips insulation from nerve fibres carrying signals from the ear to the brain. Loss of the protective coating, called myelin, disrupts electrical nerve signals.
The same process, this time due to an attack from the immune system, damages nerves in the brain and results in MS.
Loud noises are well known to lead to hearing problems, such as temporary deafness or tinnitus, but this is the first time scientists have been able to identify the underlying damage to nerve cells.
The findings are published in the journal Proceedings of the National Academy of Sciences.
Lead researcher Dr Martine Hamann, from Leicester University, said "The research allows us to understand the pathway from exposure to loud noises to hearing loss.
"Dissecting the cellular mechanisms underlying this condition is likely to bring a significant healthcare benefit. The work will help prevention as well as progression into finding cures for hearing loss."
The scientists found that myelin lost as a result of noise exposure regrows, and hearing can recover.
"We now understand why hearing loss can be reversible in certain cases," Dr Hamann added. "We showed the sheath around the auditory nerve is lost in about half of the cells we looked at. The effect is reversible and, after three months, hearing has recovered and so has the sheath."
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