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Causes
 
 
The following are some of the major causes of hearing loss.

Age
There is a progressive loss of ability to hear high frequencies with increasing age known as Presbycusis.


Noise
Noise is the cause of approximately half of all cases of hearing loss, causing at least some degree of problems in 5% of the population globally. Louder sounds cause damage to hearing in a shorter period of time. Many people are unaware of the presence of environmental sounds at damaging levels, or of the level at which sound becomes harmful. Common sources of damaging noise levels include car stereos, transportation, factory engines, maintenance equipments, power tools, gun use, construction sites etc. If one is exposed to loud sound (including music) at high levels or for extended durations (85 dB A or greater), then hearing impairment will occur.

Genetic
Hearing loss can be inherited genetically. Dominant and recessive hearing impairment can be syndromic or nonsyndromic. Eg. DFNA1, DFNB1 (also known as Connexin 26 deafness), Stickler syndrome, Waardenburg syndrome, Pendred syndrome, Usher syndrome etc.

The congenital defect microtia (small pinna) can cause full or partial deafness depending upon the severity of the deformity and whether or not certain parts of the inner or middle ear are affected.


Illness

Measles may cause auditory nerve damage
Meningitis may damage the auditory nerve or the cochlea
Autoimmune disease has only recently been recognized as a potential cause for cochlear damage.
Mumps may result in profound sensorineural hearing loss (90 dB or more), unilateral (one ear) or bilateral (both ears).
Presbycusis is a progressive hearing impairment accompanying age, typically affecting sensitivity to higher frequencies (above about 2 kHz).
Adenoids that do not disappear by adolescence may continue to grow and may obstruct the Eustachian tube, causing conductive hearing impairment and nasal infections that can spread to the middle ear.
People with HIV/AIDS frequently experience auditory system anomalies.
Premature birth causes sensorineural hearing loss approximately 5% of the time.
Syphilis is commonly transmitted from pregnant women to their fetuses, and about a third of infected children will eventually become deaf.
Otosclerosis is a hardening of the stapes (or stirrup) in the middle ear and causes conductive hearing loss.
Brain tumors can cause hearing loss

Neurological disorders
Neurological disorders such as multiple sclerosis and strokes can have an effect on hearing as well. Depending on what nerves are damaged from a stroke, one of the side effects can be deafness.

Medications
Some medications cause irreversible damage to the ear, and are limited in their use for this reason. The most important group is the aminoglycosides (main member gentamicin) and platinum based chemotherapeutics such as cisplatin.

Chemicals
In addition to medications, hearing loss can also result from specific drugs, metals, solvents such as:
Drugs: antimalarial, antibiotics, anti-inflammatory (non-steroidal), antineoplastic, diuretics etc.
Solvents: toluene (found in crude oil, gasoline and automobile exhaust), styrene, xylene, n-hexane, ethyl benzene, white spirits/Stoddard, carbon disulfide, fuels
Asphyxiants: carbon monoxide, hydrogen cyanide
Metals: lead, mercury, organotins (trimethyltin)
Pesticides/Herbicides: paraquat, organophosphates

Combined with noise, these ototoxic chemicals have an additive effect on a person’s hearing loss.

Physical trauma
People who sustain head injury are especially vulnerable to hearing loss or tinnitus, either temporary or permanent.

 


 
 +91-361-2545258
 98640-44198
Email ID
nawkahearingaidcentre
@gmail.com

Col. J. Ali Road, Lakhtokia,
Guwahati, Assam
 
 
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