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Causes

There are many different causes of hearing loss such as: meningitis, hearing loss associated with a symdrome, genetic and glue ear.

Hearing loss originates from issues associated with different parts of the ear.

Ear

Conductive Hearing Loss (CHL)

This occurs when sound cannot pass from the outer ear to the inner ear. This may be due to excessive earwax; a damaged eardrum; an ear infection or a blockage in the middle ear (as occurs in glue ear) or it may be due to problems with the structure of the outer or middle ear. In a purely conductive hearing loss, the inner ear (sensory organ of hearing known as the cochlea) functions normally. A CHL maybe medically treatable. Where this isn't possible or effective, hearing aids are often very helpful.

Sensorineural Hearing Loss (SNHL)

A sensorineural hearing loss (SNHL) is where the hair cells in the inner ear or the hearing nerve is damaged and either does not respond typically to sound or is unable to pass some/all (depending on the severity) of the sound information to the brain. This can result in a reduction of loudness and a lack of clarity. This type of hearing loss is usually permanent and cannot be corrected with medicine or surgery. Hearing aids and other listening devices are often beneficial.

Mixed Hearing Loss (MHL)

This is where both a CHL and SNHL exist in combination.  This is a combination of conductive and sensorineural hearing loss.