Hearing Loss

Hearing loss is a condition in which a person loses some or all of their hearing in one or both ears, making it difficult to perceive sounds in the environment or understand speech. The condition varies in severity: mild hearing loss, moderate, severe, and complete deafness. It can be present from birth (congenital) or develop later in life.

When discussing hearing loss, it is important to distinguish between medical and social perspectives. From a medical standpoint, the focus is on the degree of hearing loss and its physical causes. From a social perspective, many deaf and hard of hearing people view themselves as a linguistic and cultural community—particularly those who use sign languages—rather than as a group with a disease.

Types and Causes

Medical professionals typically divide hearing loss into three types. Conductive hearing loss results from obstruction or damage in the outer or middle ear, such as cerumen impaction, fluid buildup, or trauma to the ear canal. Sensorineural hearing loss arises from damage to the inner ear or to the auditory pathways that carry sound to the brain. Mixed hearing loss combines both types.

Common causes include genetics, ear infections in children, illnesses such as meningitis and untreated infectious diseases, certain medications that damage hearing, prolonged exposure to loud noise (such as in factories or amplified music), and aging. Hearing loss caused by aging is known as presbycusis.

Testing and Measurement

Hearing is measured through audiometry, in which a person listens to sounds of varying frequencies and intensities, with results recorded on a chart called an audiogram. Other tests include tympanometry, which assesses ear canal function, and newborn screening performed shortly after birth to detect hearing loss early.

Management and Communication

Hearing loss has no single solution. Some people use hearing aids to amplify sound. Those with severe or profound hearing loss may receive a cochlear implant, a device surgically placed in the inner ear that directly stimulates the auditory nerve. For conductive hearing loss, medical treatment or surgery may be possible. Sign languages, lip reading, and written captions are also used for communication.

Sign languages are natural languages with their own grammar and vocabulary, each distinct from other countries' sign languages—they are not manual representations of spoken language. Early access to hearing aids and exposure to language are crucial for the language development of deaf children, with significant effects on overall linguistic development.