<unk>  (also spelled<unk> , from Greek presbys "old" + akousis "hearing"), or age-related hearing loss, is the cumulative effect of aging on hearing. It is a progressive and irreversible bilateral symmetrical age-related sensorineural hearing loss resulting from degeneration of the cochlea or associated structures of the inner ear or auditory nerves. The hearing loss is most marked at higher frequencies. Hearing loss that accumulates with age but is caused by factors other than normal aging (nosocusis and sociocusis) is not<unk> , although differentiating the individual effects of distinct causes of hearing loss can be difficult. The cause of<unk>  is a combination of genetics, cumulative environmental exposures and pathophysiological changes related to aging. At present there are no preventive measures known; treatment is by hearing aid or surgical implant.<unk>  is the most common cause of hearing loss, afflicting one out of three persons by age 65, and one out of two by age 75.<unk>  is the second most common illness next to arthritis in aged people. Many vertebrates such as fish, birds and amphibians do not suffer<unk>  in old age as they are able to regenerate their cochlear sensory cells, whereas mammals including humans have genetically lost this regenerative ability.
Presbycusis
Autistica
Alogia
Pyromania
Pleurothotonus
Lonomia
Pellagra
Grisi siknis