Types of Sensorineural Hearing Loss
Bilateral sensorineural hearing loss – This is a hearing loss that is present in both ears, and is typically an equal amount of hearing loss in each ear. Bilateral sensorineural hearing loss is the most common type of hearing loss, as typically your ears have been exposed to all of the same sounds and genetic factors throughout your life. Most typically bilateral sensorineural hearing loss may be seen as part of typical aging, genetic hearing losses, noise induced hearing losses, or medication induced hearing losses.
Unilateral sensorineural hearing loss – This is a hearing loss that is present in only one ear; the non-affected ear will present with normal hearing. If the hearing loss in the affected ear is severe this condition can sometimes be referred to as single-sided-deafness. Individuals with unilateral sensorineural hearing loss may have difficulty telling where sounds are coming from, as everything sounds louder in their normal hearing ear. Unilateral sensorineural hearing loss can be caused from unilateral loud noise exposure (such as an explosion) or injury to the head or ear. It can also be caused by conditions such as a sudden hearing loss, Meniere’s disease, or a (typically benign) tumor compressing the nerve of hearing often called an acoustic or vestibular schwannoma.
Asymmetrical sensorineural hearing loss – This hearing loss, like bilateral sensorineural hearing loss, is a hearing loss that is present in both ears. However, asymmetrical hearing loss means that the hearing loss is worse in one ear than the other. Individuals with asymmetrical sensorineural hearing loss may have difficulty telling where sounds are coming from, as everything sounds louder in their better hearing ear. Asymmetrical hearing losses can occasionally occur naturally as part of the aging process. Additional causes may include loud noise exposure on one side of the head or injury on one side of the head, Meniere’s disease, middle ear dysfunction, or a (typically benign) tumor compressing the nerve of hearing often called an acoustic or vestibular schwannoma.