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It is often categorized into four subtypes: loudness, pain (also called noxacusis), annoyance, and fear. [1] [2] It can be a highly debilitating hearing disorder. [3] There are a variety of causes and risk factors, with the most common being exposure to loud noise. [1] It is often coincident with tinnitus. [1]
Acoustic trauma is the sustainment of an injury to the eardrum as a result of a very loud noise. Its scope usually covers loud noises with a short duration, such as an explosion, gunshot or a burst of loud shouting. Quieter sounds that are concentrated in a narrow frequency may also cause damage to specific frequency receptors. [1] The range of ...
The ear can be exposed to short periods of sound in excess of 120 dB without permanent harm — albeit with discomfort and possibly pain — but long term exposure to sound levels over 85 dB(A) can cause permanent hearing loss.
“As the ear has some of the smallest arteries and blood vessels, any disruption in the blood flow, like that associated with cardiovascular disease, can cause irreversible damage to the various ...
NIHL can be either permanent or temporary, called a threshold shift. Unsafe levels of noise can be as little as 70 dB (about twice as loud as normal conversation) if there is prolonged (24-hour) or continuous exposure. 125 dB (a loud rock concert is ~120 dB) is the pain level; sounds above this level cause instant and permanent ear damage.
Acoustic shock is the set of symptoms a person may experience after hearing an unexpected, loud sound. The loud sound, called an acoustic incident, can be caused by feedback oscillation, fax tones, or signalling tones. Telemarketers and call centre employees are thought to be most at risk. [1]
Noise-induced threshold shifts are seen as a notch on an audiogram from 3000 to 6000 Hz, but most often at 4000 Hz. [16] Exposure to loud noises, either in a single traumatic experience or over time, can damage the auditory system and result in hearing loss and sometimes tinnitus as well. Traumatic noise exposure can happen at work (e.g., loud ...
Measures to prevent tinnitus include avoiding chronic or extended exposure to loud noise, and limiting exposure to drugs and substances harmful to the ear . [ 2 ] [ 15 ] If there is an underlying cause, treating that cause may lead to improvements. [ 3 ]