Hearing loss is being partly or totally unable to hear sound in one or both ears.
Hearing loss - infants
Hearing loss of aging
Decreased hearing; Deafness; Loss of hearing; Conductive hearing loss
It is common to lose a little bit of hearing after age 20.
Hearing problems often start slowly over time. They rarely lead to total deafness.
There are many causes of hearing loss. Hearing loss can be divided into two main categories:
Conductive hearing loss (CHL) occurs because of a mechanical problem in the outer or middle ear. The three tiny bones of the ear (ossicles) may not conduct sound properly. Or, the eardrum may not vibrate in response to sound. Fluid in the middle ear can cause this type of hearing loss.
Sensorineural hearing loss (SNHL) is due to a problem with the inner ear. It most often occurs w...
Occupational hearing loss is damage to the inner ear from noise or vibrations due to certain types of jobs or entertainment.
Hearing loss - occupational
Causes, incidence, and risk factors
Occupational hearing loss is a form of acoustic trauma caused by exposure to vibration or sound. Sound is heard as the ear converts vibration from sound waves into impulses in the nerves of the ear.
Sounds above 90 decibels (dB, a measurement of the loudness or strength of sound vibration) may cause vibration intense enough to damage the inner ear, especially if the sound continues for a long time.
90 dB -- a large truck 5 yards away (motorcycles, snowmobiles, and similar engines range from 85 - 90 dB)
100 dB -- some rock concerts
120 dB -- a jackhammer about 3 feet away
130 dB -- a jet engine from 100 feet away
A general rule of thumb is that if you need to shout to be heard, the sound is in the ra...
Dear Dr. Borigini, Is TMJD (Temporomandibular Joint Disorder) often associated with migraines? I have had chronic classical migraines since Feb. 2004 due to my jaw dislocation. Patients suffering from temporomandibular joint (TMJ) disorders exhibit significantly more jaw dysfunction and pericranial muscle tenderness compared to migraine patients. Jaw pain that occurs with chewing often is considered to be TMJ dysfunction, particularly if subluxation (abnormality of the normal position of a joint) of the jaw can be shown on the physical examination. The cause of migraines is unknown; there may be some genetic influence. Regional alterations in blood flow in the brain due to dilation of the arteries in the brain accompany a migraine attack. Migraines can be on one side of the head, or they can be generalized. They may be preceded by visual changes, numbness or tingling, restlessness, or depression . The patient may have attacks daily, or every several months. I...
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