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For example, at 100 d B (nightclub music level), a 3 d B exchange rate would limit exposure to 15 minutes; the 5 d B exchange rate allows an hour.Many people are unaware of the presence of environmental sound at damaging levels, or of the level at which sound becomes harmful.As noise damage progresses, damage spreads to affect lower and higher frequencies.

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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.

Noise-induced hearing loss (NIHL) typically manifests as elevated hearing thresholds (i.e.

less sensitivity or muting) between 30 Hz, centered at 4000 Hz.

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.

Use of the terms "hearing impaired," "deaf-mute," or "deaf and dumb" to describe deaf and hard of hearing people is discouraged by advocacy organizations as they are offensive to many deaf and hard of hearing people.

Because of the cumulative impact of age and exposure to noise and other acoustic insults, 'typical' hearing may not be normative.

Hearing loss has multiple causes, including ageing, genetics, perinatal problems and acquired causes like noise and disease.

For some kinds of hearing loss the cause may be classified as of unknown cause.

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