Deafness and Hearing Loss
Hearing loss falls into two categories: conductive, which involves sound transmission abnormalities in the middle and outer ear, and sensorineural, which involves the inner ear. Conductive loss can usually be corrected; sensorineural is much more difficult to treat. Conductive hearing loss might result, for example, when impacted earwax prevents sounds from reaching the inner ear, where sounds are translated into electric nerve impulses that are transmitted to the brain. Other causes of conductive loss might be an injury to the eardrum or a middle-ear infection.In sensorineural loss, there is nerve failure. Thus, even though sound vibrations reach the inner ear, they dont get sent on as impulses to the brain. This type of hearing loss results from nerve damage, which can be caused by old age, viral infection, loud noises, or the side effects of medication, to name just a few.