1. Body hearing aid- for mild to profound deafness.
Adv- prevents acoustic feedback through seperation of reciever and microphone for high amplification.
Disadv-  bulky, requires long wire which may be cosmetically displeasing.

2. Behind the ear hearing aid- for mild to profound deafness.
Adv- larger size lets the use of larger components for more power and features, and versatile due to size and it no longer needs long wires.
Disadv- large size is the only disadvantage.

3. In the ear hearing aid- for mild to moderately severe deafness.
Adv- custom fit to contour of ear, needs no tubes or cords and a miniature microphone located in the ear to look more natural and cosmetically more apealing due to easy concealment.
Disadv- smaller size limits the output. Those who have arthritis who cannot perform tasks requiring manual dexterity may have difficulty with the small size of aid and battery.

4. In the canal hearing aid- for mild to moderately severe deafness.
Adv- the same advantage as of in the ear hearing aid. It is even less visible and more cosmetically pleasing.
Disadv- smaller than the in the ear hearing aid requires good manual dexterity.

Hearing aids should be generally cared carefully. The patient must know how to take care of it and what to do if it fails. They must also have spare parts readily available.

Common medical problems among hearing aid users are otitis externa and pressure ulcers in the external auditory canal or meatus.

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