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Studies of primitive peoples indicate that much of what has been attributed to age-related hearing loss may be long term cumulative damage from all sources, especially noise.People living in preindustrial societies have considerably less hearing loss than similar populations living in modern society. 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.As noise damage progresses, damage spreads to affect lower and higher frequencies.On an audiogram, the resulting configuration has a distinctive notch, called a 'noise' notch.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.
Noise damage is cumulative; all sources of damage must be considered to assess risk.
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.
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.
For some kinds of hearing loss the cause may be classified as of unknown cause.