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Causes of Hearing loss
Nov 05, 2013

Some causes of hearing loss include damage to the inner ear, a build-up of earwax,infections and a ruptured eardrum. To understand how hearing loss occurs, it can be helpful to understand how you hear.

How you hear

Hearing occurs when sound waves reach the structures inside your ear, where the sound wave vibrations are converted into nerve signals that your brain recognizes as sound.


Your earconsists of three major areas: outer ear, middle ear and inner ear. Sound wavespass through the outer ear and cause vibrations at the eardrum. The eardrum andthree small bones of the middle ear — the hammer, anvil and stirrup — amplifythe vibrations as they travel to the inner ear. There, the vibrations passthrough fluid in the cochlea, a snail-shaped structure in the inner ear.


Attached to nerve cells in the cochlea are thousands of tiny hairs that help translate sound vibrations into electrical signals that are transmitted to your brain.The vibrations of different sounds affect these tiny hairs in different ways,causing the nerve cells to send different signals to your brain. That's how you distinguish one sound from another.


How hearing loss can occur

Causes of hearing loss include:



  • Damage to the inner ear.


Aging and prolonged exposure to loud noise may cause wear and tear on the hairs or nerve cells in the cochlea that send sound signals to the brain. When these hairs or nerve cells are damaged or missing, electrical signals aren't transmitted as efficiently, and hearing loss occurs. Higher pitched tones may become muffled to you. It may become difficult for you to pick out words against background noise. Heredity may make you more prone to these changes. This type of hearing loss is known as sensorineural hearing loss, which is permanent.


  • A gradual build-up of earwax.


Earwax canblock the ear canal and prevent conduction of sound waves. Earwax blockage is acause of hearing loss among people of all ages. This causes conductive hearingloss, which usually can be restored with earwax removal.



  • Ear infection and abnormal bone growths or tumors.


In the outeror middle ear, any of these can causehearing loss.



  • Ruptured eardrum (tympanic membrane perforation). Loud blasts of noise, sudden changes in pressure, poking your eardrum with an object and infection can cause your eardrum to rupture and affect your hearing.