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For some kinds of hearing loss the cause may be classified as of unknown cause.There is a progressive loss of ability to hear high frequencies with aging known as presbycusis.For men, this can start as early as 25 and women at 30.Although genetically variable it is a normal concomitant of ageing and is distinct from hearing losses caused by noise exposure, toxins or disease agents.

0 d B does not represent absence of sound, but rather the softest sound an average unimpaired human ear can hear; some people can hear down to -5 or even -10 d B. But the ear doesn't hear all frequencies equally well; hearing sensitivity peaks around 3000 Hz.Common sources of damaging noise levels include car stereos, children's toys, motor vehicles, crowds, lawn and maintenance equipment, power tools, gun use, musical instruments, and even hair dryers.Noise damage is cumulative; all sources of damage must be considered to assess risk.Hearing loss due to noise may be temporary, called a 'temporary threshold shift', a reduced sensitivity to sound over a wide frequency range resulting from exposure to a brief but very loud noise like a gunshot, firecracker, jet engine, jackhammer, etc.or to exposure to loud sound over a few hours such as during a pop concert or nightclub session.

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