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Causes of tinnitus with hearing loss, tinnitus and no hearing loss - Test Out

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Noise-Induced Hearing Loss (NIHL) occurs when loud noise damages the working of the inner ear and causes hearing loss. Roughly 20% of adults in the US, about 48 million people, report some degree of hearing loss.
According to the American Tinnitus Association, Noise-Induced Hearing Loss (NIHL) and tinnitus is currently the number one service connected disability of veterans returning from Iraq and Afghanistan.
Hearing depends on a series of events that change sound waves in the air into electrical signals.
If a neuron in the auditory cortex is not getting input from the hearing nerve, it might well pick up electrical activity in an adjacent region and respond to that. There are many factors that have been associated with an increased risk of developing tinnitus. Another hypothesis is that tinnitus develops because of changes in how the brain processes sound in response to altered input from the cochlea.

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Sound waves cause the eardrum to vibrate and transmit the vibrations to three tiny bones in the middle ear.
The bones in the middle ear amplify and transmit the vibrations from the air to fluid vibrations in the cochlea of the inner ear, which is shaped like a snail and filled with fluid. As fluid is churned in the cochlea from vibration coming from the middle ear bones, the fluid rushes past these hairs and causes them to bend. When the cells are presented with an overstimulation of their frequency their supportive structure becomes swollen and can rupture, destroying the hair cell. Exacerbation of noise-induced hearing loss in mice lacking the glutamate transporter GLAST.
In order to better understand this, it is necessary to first understand the basics of how hearing operates and then review how noise damages hearing and its effects on the ears and brain.

The bending of these hairs opens a sort of trap door underneath them, allowing the potassium-rich fluid they live in to reach a sodium-filled fluid underneath, and potassium mixed with sodium makes electricity. This excess glutamate overexcites the neurons and causes them to fire continuously until they become chemically depleted and eventually die.
So, even though there is no real sound being generated at that frequency, it sounds as if there is and that, by definition, is tinnitus. When hearing loss occurs, certain brain neurons lack input in the regions where the hearing loss is most severe.

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