hearing loss caused by exposure to harmful sounds, either very loud impulse sound(s) or repeated exposure to sounds over 90-decibel level over an extended period of time that damage the sensitive structures of the inner ear.

A type of hearing loss caused by the introduction of intense volumes into a human ear system over long periods of time or very intense volumes for a short period of time. The hearing loss often is worse on the side of exposure and is most pronounced in the higher frequencies.

Irreversible hearing loss caused by exposure to very loud impulse sounds, such as an explosion, or to less-intense sounds for an extended period of time. Loud noise levels damage hair cells of the inner ear.

A sensorineural hearing loss caused by repeated exposure to high intensity sound levels. Noise induced hearing loss is characterized by irreversible damage to the sensory hair cells located within the inner ear. The condition is usually prevented by limiting noise exposures or by using personal hearing protective devices. (From: Worker Healthbook, 2000; National Institute for Occupational Safety and Health)