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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.There are many qualities of human hearing besides frequency range and amplitude that can't easily be measured quantitatively.But for many practical purposes, normative hearing is defined by a frequency versus amplitude graph, or audiogram, charting sensitivity thresholds of hearing at defined frequencies. Hearing loss may be caused by a number of factors, including: genetics, ageing, exposure to noise, some infections, birth complications, trauma to the ear, and certain medications or toxins.

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Various governmental, industry and standards organizations set noise standards. Louder sounds cause damage in a shorter period of time.

Human hearing extends in frequency from 20-20,000 Hz, and in amplitude from 0 d B to 130 d B or more.

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.

If one is exposed to loud sound (including music) at high levels or for extended durations (85 d B A or greater), then hearing loss will occur.

Sound intensity (sound energy, or propensity to cause damage to the ears) increases dramatically with proximity according to an inverse square law: halving the distance to the sound quadruples the sound intensity.

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