Causes of Deafness and
Hearing Loss
Hearing impairment and loss are due to the following factors:
a) Conductive Deafness
is better understood when you are acquainted with the structure of the
ear.
The sound is conducted through the air into the outer ear.
On reaching the tympanic membrane the sound waves changes the fluid level in
semicircular canals. The passage of air in the outer ear is called the
'Conductive Pathway.' The conductive pathway can get affected due to build up
of wax in the ear, a foreign body in the pathway, and any swelling of the outer
ear.
The conditions can cause temporary deafness that can be medically
treated. Conductive deafness causes blockage of the Eustachian tube. The
blocking fluid becomes thick like 'glue' and can be drained out with
surgical operation.
b) Sensory Neural
Deafness is due to the damage of the ear drum, cochlea, auditory nerve and the
associated brain cells. Such a damage can be (i) congenital or (ii) acquired.
c) Congenital Deafness
can be due to genetic disorders and premature birth. A pregnant mother
having German Measles during the first trimester of pregnancy may give birth to
a deaf child. An attack of severe jaundice in which the mother's blood is
incompatible with that of the foetus also results in congenital deafness.
d. Mixed Hearing Loss is a
result of hearing impairments arising due
to a combination of conductive and sensory neural defects.
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