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Types of Hearing Loss Hearing loss can be categorized by which part of the auditory system is damaged.
Causes of Hearing Loss Congenital Hearing Loss (Hearing Loss at Birth) Non-genetic factors can account for about 25% of congenital hearing loss. There are two different types of hearing impairments, conductive hearing loss and sensorineural hearing loss. A conductive hearing loss is present when the sound is not reaching the inner ear, known as the cochlea. Dysfunction of the three small bones of the middle ear, the hammer, anvil and stapes may result in conductive hearing loss.
A sensorineural hearing loss is one resulting from dysfunction of the inner ear, the cochlea, the nerve that transmits the impulses from the cochlea to the hearing center in the brain or damage in the brain. Another common reason for hearing loss due to hair cell damage is noise-induced hearing loss.


Total or near-total sensorineural deafness may be the result of congenital malformations, head trauma, inner ear infection, genetic factors, or long history of excessive noise exposure. Send Home Our method Usage examples Index Contact StatisticsWe do not evaluate or guarantee the accuracy of any content in this site. There are three basic types of hearing loss: Conductive Hearing Loss Conductive hearing loss occurs when sound is not conducted efficiently through the outer earcanal to the eardrum and the tiny bones (ossicles) of the middle ear. The mobility of these bones, or ossicles, may be impaired for different reasons and disruption of the ossicular chain due to trauma, infection or other process may also result in hearing loss.
Chronic ear infection can result in a defective eardrum or middle ear cavity, and often in addition to the conuctive hearing loss the individual may have a sensorineural hearing impairment. Hearing impairments are categorized by their type - conductive, sensorineural or both, by their severity, and by the age of onset. This will often interfere with speech understanding, as it is in the high frequency range that we find the consonant sounds that are most important especially in noisy surroundings.


Furthermore, a hearing impairment may exist in only one ear (unilateral) or in both ears (bilateral). Head trauma, ear infections, tumors and toxic medications such as certain strong antibiotics and chemotherapeutics are other reasons for sensorineural hearing loss. Depending on the definition it could be estimated that more than 50% of the population over the age of 70 has impaired hearing.




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