People with sensorineural hearing loss can choose from four basic types of hearing aid.

Type 1: In-the-ear devices fit in the outer ear and can include a telecoil that improves sound during telephone calls. Their small size can lead to adjustment problems and they're liable to be damaged by earwax.

Type 2: Behind-the-ear aids are connected to an earmould inside the ear through which the sound travels, and are suitable for users of all ages.

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Type 3: Canal aids fit in the ear canal and come in two sizes. In-the-canal hearing aids are shaped to fit the individual's ear canal, whereas Completely-in-canal hearing aids are largely concealed within the ear. Their size and placement render them difficult to adjust and they are not normally recommended for children.

Type 4: Body aids are recommended for people with profound hearing loss for whom the other types are not suitable. They are attached to a belt or pocket and are connected to the ear by a wire.

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