Noise induced hearing loss...
Continuous exposure to loud noise can damage the structure of hair cells, resulting in hearing loss and tinnitus.
When a person is exposed to loud noise over a long period of time, symptoms of noise induced hearing loss (NIHL) will increase gradually. Over time, the sounds a person hears may become 'distorted or muffled' and it may be difficult for the person to understand speech, especially in background noise. Someone with NIHL may not even be aware of the loss, they just think that everyone mumbles. A NIHL can be detected with a hearing test.
Tinnitus...
Tinnitus is the perception of sounds or noise within the ears with no external sound source. These sounds are often described as ringing, humming or buzzing noises and they can be constant or periodic.
Tinnitus can be triggered by a variety of causes, but is commonly linked to exposure to loud sounds, which can damage the delicate sensory cells of the inner ear.
Hyperacusis...
Hyperacusis is a condition characterised by an over sensitivity to certain frequency ranges of sound. A person with severe hyperacusis has difficulty tolerating everday sounds.
The most common cause of hyperacusis is over exposure to excessively high noise. The symptoms are ear pain, annoyance, and general intolerance to any sounds most people don't notice or consider unpleasant.
Diplacusis...
Diplacusis is the perception of a single auditory stimulus as two seperate sounds which may differ in pitch or in time. It is typicaly experienced as a secondary symptom of sensorineural hearing loss

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