Hearing loss is defined as either conductive or sensorineural.
Conductive
When sound cannot reach the inner ear through normal air conduction channels, the hearing loss is considered to be conductive.
Conductive hearing loss is often responsive to medical or surgical treatment.
Some possible causes of conductive hearing loss are impacted cerumen (earwax), perforated eardrum, or fluid in the middle ear.
Sensorineural
This type of hearing loss results from disease or damage in the cochlea (inner ear) or along the nerve pathway from the inner ear to the brain.
This type of hearing loss is permanent.
One of the most common types of hearing loss in adults is sensorineural, as a result of aging and/or noise exposure.