In a normal hearing ear the sound enters the opening of the outer ear and hits the ear drum causing it to vibrate. The vibrations cause the bones of the middle ear to move and transfer the sound to the cochlea. The cochlea is a shell shaped structure in the inner ear which houses the hair cells. These hair cells are stimulated and cause electrical impulses in the hearing nerve which travel to the brain and are registered as sound.
· A hearing loss can occur if any of these processes are impaired.
· A hearing loss can have different severities ranging from mild to profound.
· A hearing loss can also have different causes.