Hearing aids and cochlear implants
- Topic
Hearing aids amplify sound for an ear that still works; a cochlear implant stimulates the hearing nerve directly when the ear no longer responds.
What it is
Hearing rehabilitation aims to help people with permanent hearing loss communicate again. It includes technologies (hearing aids, cochlear implants, bone-conduction and middle-ear implants), speech and language therapy, sign language and supports such as captioning. The choice depends on the type and degree of loss, on age and on whether the person had acquired language before losing hearing. This page summarises what each option does and when to refer; the underlying disease has its own page.
Key facts
- Parts of a cochlear implant: microphone, speech processor, transmitter and receiver-stimulator, and an electrode array that reaches different regions of the auditory nerve.
- The processor and microphone sit behind the ear; the receiver-stimulator and electrodes are implanted under the skin and into the cochlea.
- Types of hearing aid: behind-the-ear (all ages, mild to profound loss), in-the-ear (mild to severe) and in-the-canal (mild to moderately severe).
- Digital hearing aids can amplify specific frequencies and focus on sound from one direction.
- When starting hearing aids, the occlusion effect (one's own voice sounds blocked), feedback and background noise are common; most people adapt with regular use.
- The WHO also lists bone-conduction implants, middle-ear implants, FM and loop systems, captioning and sign language interpretation.
Step by step
- Confirm the type and degree of hearing loss with audiometry (and objective tests in children).
- Exclude treatable causes: wax, otitis, cholesteatoma, sudden hearing loss.
- Ask which communication situations are hardest for the person and what their goal is.
- Arrange a hearing aid trial with fitting and follow-up by audiology.
- If benefit is minimal with the best amplification, refer for cochlear implant assessment.
- Add speech and language therapy, counselling and communication supports for the person and the family.
Hearing rehabilitation options
| Option | How it works | For whom | What it does not do |
|---|---|---|---|
| Hearing aid | Picks up, amplifies and delivers sound to the ear canal | Mainly sensorineural hearing loss with enough hair cells | Does not restore normal hearing; also amplifies background noise |
| Cochlear implant | Turns sound into electrical impulses that stimulate the auditory nerve | Deafness or severe to profound loss with little benefit from hearing aids | Hearing differs from natural hearing and needs therapy to learn to hear |
| Bone-conduction and middle-ear implants | Implantable technologies the WHO lists alongside hearing aids | Cases selected by otology | Do not replace a full audiological assessment |
| Communication and supports | Sign language, speechreading, captioning, FM and loop systems | Anyone with hearing loss and their family, according to preference | Do not depend on hearing technology; they complement it |
In clinical practice
- In older adults with presbycusis, lack of information and stigma hold back help-seeking (WHO): ask about hearing at every review.
- In a child with confirmed hearing loss, intervention should start no later than 6 months of age (Resolution 207 of 2024).
- Since 2020 the United States regulator has approved cochlear implants for eligible children from 9 months of age.
- The WHO estimates that over 430 million people need rehabilitation for disabling hearing loss.
Next step / Initial management
- Initial workup: otoscopy, pure-tone audiometry and speech audiometry (speech discrimination); objective tests in children.
- First line: hearing aids fitted by audiology, with speech and language therapy and counselling.
- Routine referral to otology for cochlear implant assessment if there is bilateral severe to profound sensorineural loss with little benefit from hearing aids.
- Urgent referral to ENT and paediatric audiology if a child has confirmed hearing loss: intervention should start before 6 months.
- Same-day referral if the loss is sudden: treat the cause first, then rehabilitate.
Test yourself
Think of the answer, then tap the question to see it.
An adult became deaf in both ears after meningitis and cannot understand sentences with the best hearing aids. Which option is assessed?
Cochlear implant: bilateral severe to profound sensorineural hearing loss with sentence discrimination of 30 % or less with the best amplification.
Why may a hearing aid fail in a badly damaged cochlea?
Because it only amplifies sound; it needs surviving hair cells to pick up the amplified vibration. If the inner ear is badly damaged, nothing turns it into a signal.
What is the essential difference between a hearing aid and a cochlear implant?
A hearing aid amplifies the sound that reaches the cochlea; a cochlear implant bypasses the damaged cells and stimulates the auditory nerve directly with electrodes.
Connections
Educational content; it does not replace a medical assessment and is not a clinical instruction. For a real case, follow current guidelines and specialist advice.
Sources: Hearing Aids (National Institute on Deafness and Other Communication Disorders (NIDCD), 2022); Cochlear Implants (National Institute on Deafness and Other Communication Disorders (NIDCD), 2024); Deafness and hearing loss (fact sheet) (World Health Organization, 2026); Guía de Atención Integral Basada en la Evidencia para Hipoacusia Neurosensorial Inducida por Ruido en el Lugar de Trabajo (GATI-HNIR) (Ministerio de la Protección Social, República de Colombia, 2006); Resolución 207 de 2024: lineamientos técnicos y operativos del Programa de Tamizaje Neonatal (Ministerio de Salud y Protección Social (compilación normativa de la Superintendencia Nacional de Salud), 2024); World report on hearing: executive summary (World Health Organization, 2021).
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Representative model, for educational purposes only.