Some people are born with a genetic mutation of the hair cells which limit low frequency hearing. There are drugs that are known to be ototoxic, meaning they have the potential to damage the auditory system and cause sonus complete. This can be caused by earwax buildup, fluid in the ear perhaps from an ear infection. For most children, as long as they get the care they need when they have an infection, this will never be a problem, but for other children, sonus complete is a possibility. The clear symptom of this problem is when a person is unable to respond to fair sounds. Therefore, this hearing impairment occurs in not only the outer and/or middle ear but also the inner ear and/or hearing nerve. It can be genetic or it can result from disease, trauma, certain medications, or long-term exposure to noise.
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