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Tinnitus is usually subjective, meaning that the sounds the person hears are not detectable by means currently available to physicians and hearing technicians. [3] Subjective tinnitus has also been called "tinnitus aurium", "non-auditory", or "non-vibratory" tinnitus. In rare cases, tinnitus can be heard by someone else using a stethoscope.
In some cases, tinnitus may become a permanent condition. [10] There is no specific study done on Life Expectancy or statistical information for the prognosis of acoustic trauma. Overall, depending on how powerful the noise was and how and what degree of the severity, the prognosis is quite difficult to predict.
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.
However, many people with tinnitus can still perform normally on commonly administered hearing tests, he said. Such evaluations, called pure tone tests, often require patients to raise their hands ...
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.
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.