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The most common cause of tinnitus is hearing loss. Hearing loss may have many different causes, ... should have minimal risk to permanent damage to their hearing.
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.
When wax builds up, it causes muffled hearing, tinnitus, or aural fullness (plugged-up feeling in the ears). ... the damage can be permanent. This is called noise-induced hearing loss (NIHL), and ...
High frequency hearing loss causes a high pitched tinnitus and low frequency hearing loss causes a roaring tinnitus. [19] Noise-induced tinnitus can be temporary or permanent depending on the type and amount of noise a person was exposed to.
Eustachian tube dysfunction can be caused by a number of factors. Some common causes include the flu, allergies, a cold, and sinus infections. [6] In patients with chronic ear disease such as cholesteatoma and chronic discharge, studies showed that they have obstructive pathology at the ear side of the Eustachian tube.
Hearing loss usually fluctuates in the beginning stages and becomes more permanent in later stages. Ménière's disease has a course of 5–15 years, and people generally end up with mild disequilibrium, tinnitus, and moderate hearing loss in one ear. [5]
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. [31] There are two basic types of NIHL: NIHL caused by acoustic trauma; NIHL that gradually develops.
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. In the US, 12.5% of children aged 6–19 years have permanent hearing damage from excessive noise exposure. [15]
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