Refers to the hearing loss which occurs throughout the life. The onset of this kind of hearing loss can be sudden or progressive. 

The example of sudden onset hearing loss is usually caused by traumatic incident (e.g. vehicle accident, slapped/punched directly on the ear ;bullied victim, directly exposed to grenade explosion ;those involved in war),

while the example for progressive hearing loss is those with acoustic neuroma (tumour on the eigth cranial nerve) whereby the hearing worsen by time, or elderly with presbycusis, hearing problem which happens due to aging factor, or those with cancer under chemotherapy treatment, the hearing loss will be progressively worsen.




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