The loss of hearing that occurs or develops some time
during a person's life but was not present at birth.
Acquired deafness contrasts to congenital deafness which is present at birth.
The distinction between acquired and congenital deafness specifies only the time
that the deafness appears. It does not specify whether the cause of the deafness
is genetic (inherited).
Acquired deafness may or may not be genetic. For example, it may be a manifestation
of a delayed-onset form of genetic deafness. Or acquired deafness may be due to
damage to the ear from noise.
Congenital deafness similarly may or may not be genetic. For example, it may
be associated with a white forelock and be caused by a genetic disease called Waardenburg
syndrome. Or congenital deafness may be due to something such as the rubella virus
to which the mother was exposed during pregnancy.
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