Causes of Deafness
Conductive hearing loss occurs when sound vibrations don't go from the air around a person to the moving bones of the inner ear as well as they should. If something is blocking the ear canal, like ear wax, there is a conductive hearing loss. If there is fluid inside the inner ear where the bones are, like the fluid from an inner ear infection, there is a conductive hearing loss. If the bones of the ear get a buildup of calcium, from a disease perhaps, and they can't move as freely as they need to, there is a conductive hearing loss. Generally, conductive hearing loss doesn't cause a total inability to hear, but it does cause a loss of loudness and a loss of clarity. In other words, sounds are heard, but they are weak, muffled, and distorted.
loss (Nerve deafness) occurs
when the auditory nerve, which goes from the inner ear to the
brain, fails to carry the sound information to the brain. Neural
hearing loss can cause a loss of loudness or a loss of clarity in
hearingloss is a
combination of conductive and neural hearing losses.
Heredity. Some people are born deaf. Usually the cause is unknown. Sometimes people will say it's because of something that happened to the mother during her pregnancy, but this is often just guessing. Although deafness does sometimes "run in families," deaf parents often have hearing children and hearing parents often have deaf children.
Diseases of the
Ear infections are diseases which can cause fluid or mucus to build up inside the ear. If pressure builds up inside the ear, the eardrum is less flexible than it should be. As the ear heals, the fluids drain out of the ear or are absorbed into the body. Some hearing may be lost during the infection; it may or may not return when the infection is healed.
Injuries of the Ear
Punctures of the Eardrum. Hearing loss can be the result of a hole in the eardrum, which could be caused by either injury or disease. The eardrum is the thin membrane that separates the ear canal and the middle ear. The middle ear is connected to the throat by the eustachian tube, which relieves the pressure in the middle ear. So a hole in the eardrum causes a loss of hearing and sometimes fluids can drain from the ear. Luckily the eardrum usually heals itself, although it can take a few weeks or months. While the eardrum is healing, it must be protected from water and from further injuries. If the eardrum doesn't heal by itself, it may need surgery. The amount of hearing that is lost depends on the size of the hole in the eardrum and a lot of other things.
Injuries which can perforate the eardrum include:
Hearingand Hearing Loss |Causes of Deafness| Sign Language | Living With Deafness| About the Authors | Notes, Letters, and Posted Questions