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Hearing Aids - NIDCD

DEPARTMENT OF HEALTH AND HUMAN SERVICES National Institutes of Health NIDCD Fact Sheet | Hearing and Balance Hearing aids What is a Hearing aid? A Hearing aid is a small electronic device that you wear in or behind your ear. It makes some sounds louder so that a person with Hearing loss can listen, communicate, and participate more fully in daily activities. A Hearing aid can help people hear more in both quiet and noisy situations. However, only about one out of five people who would benefit from a Hearing aid actually uses one. A Hearing aid has three basic parts: a microphone, amplifier, and speaker. The Hearing aid receives sound through a microphone, which converts the sound waves to electrical signals and sends them to an amplifier.

A hearing aid magniies sound vibrations entering the ear. Surviving hair cells detect the larger vibrations and convert them into neural signals that are passed along to the brain. The greater the damage to a person’s hair cells, the more severe the hearing loss, and the greater the hearing aid ampliication needed to make up the difference.

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