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Although there are many levels of hearing loss, when the hearing threshold falls below 30 dB, one can objectively speak about a deafness issue. One might speak about deafness or severe hearing loss in situations where the noise level is between 80 and 100 dB. Cofosis, or total loss of hearing, is the inability to sense anything at all.
Deafness does not always have the same cause. Sometimes the issue is with the middle or outer ear. Sound cannot reach the inner ear due to this defect. One of the reasons of this form of hearing loss, known as transmission deafness, is a malfunctioning eardrum as a result of ruptures, inadequate ventilation or otitis, or some congenital change of the chain of bones (the malleus, the incus, and the stirrup) that amplify and transmit sound to the inner ear.
Perception or neurosensory deafness is a different kind of hearing loss. It happens when a lesion affects either the auditory nerve, which sends sound waves to the brain and is what actually causes us to hear, or the inner ear (cochlea). In this way, even if every component of the ear is functioning normally, we will still be unable to perceive anything if the nerve that sends the sound signal to the brain is damaged.

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