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“We know now that the hearing test does not tell you the whole story,” Maison said. The study involved 294 participants ages 18 to 72 who all performed normally on a pure tone test.
Tinnitus is described as hearing a sound when an external sound is not present. [13] Noise-induced hearing loss can cause high-pitched tinnitus. [14] An estimated 50 million Americans have some degree of tinnitus in one or both ears; 16 million of them have symptoms serious enough for them to see a doctor or hearing specialist.
Since most people with tinnitus also have hearing loss, a pure tone hearing test resulting in an audiogram may help diagnose a cause. An audiogram may also facilitate fitting of a hearing aid in those cases where hearing loss is significant. The pitch of tinnitus is often in the range of the hearing loss.
Though the pathophysiology of tinnitus is not known, noise exposure can be a contributing factor, therefore tinnitus can be associated with hearing loss, generated by the cochlea and central nervous system (CNS). High frequency hearing loss causes a high pitched tinnitus and low frequency hearing loss causes a roaring tinnitus. [19]
The doctor will also look at your blood pressure, which can also affect tinnitus. To rule out other conditions, you may also have imaging (such as an MRI of the head and neck), CT scan, or an MRA ...
The individual will deny hearing anything if he/she is a malingerer. An individual with true hearing loss should continue to hear the sound on the better hearing side. Alternatively, this test can be performed more accurately using a two-channel audiometer using pure tone signals. [3]
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