The main reasons for this are like middle ear infections i.e. otitis media, collection of glue in the middle ear, blockage of the outer ear by wax, damage to the eardrum by infection or an injury.
There may also be certain other conditions like otosclerosis that is a condition in which the cossicles of middle ear become immobile because of growth of the surrounding bone. Rarely, it may also occur due to rheumatoid arthritis affecting the joints between the cossicles.
Sensorineural hearing loss
It is mainly due to damage to the pathway for sound impulses from the hair cells of inner ear to the auditory nerve and the brain. The various causes are as follow-
There may e age-related hearing loss that is many people experiences hearing loss at an older age. Acoustic trauma caused by injury due to loud noise, viral infections of the inner ear, Meniere’s disease and intake of certain drugs such as aspirin, quinine and some other antibiotics, may all lead to sensor -neural hearing loss.
Diagnosis of hearing loss
In adults, hearing loss may be very gradual, as in age related hearing loss or it may be very sudden as in cases of some viral infections of the inner ear. A person who experiences hearing loss can have a wide range of tests particularly at an audiology clinic of the local hospital or health centre.
When examining a person with hearing loss, the doctor wants to know how the hearing loss has developed and what sort of problem it causes. He/she performs a physical examination. Tuning forks and a special electronic device with headphones are used to test the degree of hearing loss.
Hearing tests are like an audiometer is used which produces sounds of different volumes and pitch. Hearing loss is measured in decibels bearing level. It the cause of the hearing loss seems to be due to a brain abnormality then a magnetic resonance imaging scan of the head is usually recommended.
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