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There are three main types of hearing loss. These include conductive hearing loss, sensorineural hearing loss, and mixed hearing loss. Your child’s audiologist (healthcare professional who specializes in hearing problems) can tell you which type of hearing loss your child has. The audiologist can also help you determine the next steps of your child’s care. On this sheet is an overview of the different types of hearing loss.
The ear has three parts, each with its own task. The outer ear collects sound and sends it to the middle ear. There, sound is changed into vibrations. These vibrations travel to the inner ear where tiny “hair cells” (cilia) and the hearing nerve turn the vibrations into nerve impulses (signals). These signals are sent to the brain. The brain then figures out which ear the sound is coming from. With hearing loss, either a temporary blockage or a permanent problem within the ear or brain keeps sound from being heard or understood.
Conductive hearing loss is common in children. It can affect one or both ears. For someone to hear, sound signals must travel from outside the ear through the ear canal and eardrum into the inner ear. Conductive hearing loss results when sound becomes partially or fully blocked in the outer or middle ear. Some causes may include:
Fluid buildup behind the eardrum (often leading to repeated ear infections)
Wax buildup in the ear canal
Problems with the eardrum
Abnormal formation of ear bones
Object stuck in the ear canal, such as food or a toy part
Conductive hearing loss is often temporary and may be improved with medical or surgical procedures. And once the blockage or problem is taken care of, hearing often returns to normal. If fluid buildup behind the eardrum is the cause, tiny tubes may be inserted into the eardrum to help drain the fluid. Your healthcare provider can tell you more about what’s causing your child’s hearing loss and how it can be treated or managed.
Sensorineural hearing loss can affect one or both ears. It is due to problems with the inner ear or damage to the hair cells or nerves inside the inner ear. To hear properly, these hair cells and nerves must process and carry sound to the brain. The brain then senses what we “hear.” With sensorineural hearing loss, the hair cells or nerves are damaged and do not send the signals needed for hearing to the brain. Some causes include:
Exposure to very loud noise
Infection of mother during pregnancy
Certain types of infection in the child
Medications that are toxic to the ear (such as some cancer medications)
Trauma during birth
Family history of permanent hearing loss
Sensorineural hearing loss is usually permanent. So treatment involves using devices that help the child hear as well as possible. These devices include:
Hearing aids. Electronic devices that amplify sound (make sound louder).
Cochlear implants. Surgically implanted devices that help the child sense sound. Cochlear implants are used when the hearing loss is too severe to be treated with hearing aids.
Assistive listening devices (ALDs). ALDs, such as FM systems, require the person speaking to wear a microphone. The person’s voice is then transmitted into the child’s hearing aids, cochlear implants, or earphones. Assistive listening devices allow the child to hear the person speaking without distracting background noise. FM systems can be used in classrooms to help children with hearing loss hear their teachers.
Mixed hearing loss is a combination of conductive and sensorineural hearing loss. Treatment depends on the cause of the hearing loss. A combination of treatment methods can be used to help the child hear well.
Auditory Processing Disorder
A less common “hearing” problem is auditory processing disorder (APD). APD occurs when the ear works properly, but the brain doesn’t interpret sound correctly. To hear words correctly, the brain must recognize and interpret the sounds that are sent to the brain. With APD, something keeps the brain from properly processing or interpreting the sounds that make up a word or words. So subtle differences between sounds in words cannot be heard and words are misheard. It is unknown why APD occurs. Some signs of APD include:
Poor listening skills
Difficulty understanding speech and interpreting background noise
Trouble paying attention to and remembering information given orally (such as in a classroom)
Struggling with language, such as mixing up syllables in words
Trouble with reading, comprehension, spelling, and vocabulary
Poor performance, misbehavior, and frustration at school
Tests can be done to determine if your child has APD. Talk to your child’s healthcare provider if you think he or she needs to be tested. APD and auditory neuropathy (see below) are often confused with hearing loss. In fact, they are problems with understanding speech.
Like APD, the ear works properly with auditory neuropathy (AN). But there is a problem that keeps the brain from recognizing and interpreting sound correctly. This causes words to be misheard. Sounds may also fade in and out. The cause of AN is unknown. Scientists think it may be related to problems with the hearing nerve, but more research needs to be done. There are hearing tests available to check for AN.