Radiation can cause Hearing Loss , New Delhi, India

March 18, 2011 - PRLog -- Radiation can damage hearing. Hearing loss interferes with daily living. If you received these treatments, it is important to have your hearing checked and to obtain treatment if hearing loss is found. It’s easier to understand hearing loss if you understand how the ears work. The ear is made up of three main parts, known as the outer, middle, and inner ear.

Outer ear
Sound waves travel through the air and first enter the body through the outer ear. The part of the ear that can be seen outside the body is called the pinna. The pinna collects and funnels sound into the auditory (ear) canal. The auditory canal is like a tunnel. It makes the sound louder and directs it toward the middle ear.

Middle Ear
The eardrum separates the outer ear from the middle ear, a chamber that is normally filled with air. Inside the middle ear are three tiny bones (ossicles) that form a chain connecting the eardrum to the opening of the inner ear. Sound waves cause the eardrum to vibrate. These vibrations cause the three tiny bones in the middle ear to move, transmitting the sound to the inner ear.

Inner Ear
The inner ear is known as the cochlea, and it is filled with fluid. The cochlea contains thousands of tiny nerve endings, known as sensory hair cells. Sounds travels in waves through the fluid of the inner ear. The sensory hair cells change the sound waves into nerve impulses that are sent to the brain by way of the auditory nerve (also known as the eighth cranial nerve). In the cochlea, the sensory hair cells are arranged in order of pitch, from low-pitched sounds (such as a man’s voice) to very high-pitched sounds (such as a bird’s chirping). Each hair cell is sensitive to a specific range of pitches.

High doses of radiation to the ear or brain can cause inflammation or ear wax buildup in the outer ear, problems with fluid buildup in the middle ear, or stiffness of the eardrum or middle ear bones. Any of these problems can result in conductive hearing loss. Radiation can also damage the sensory hair cells in the inner ear, causing sensorineural hearing loss.
Damage from radiation may affect one or both ears, depending on the area of radiation treatment. Conductive hearing loss may improve over time, but sensorineural hearing loss is usually permanent.
Symptoms of hearing loss may include:
•   Ringing or tinkling sounds in the ear
•   Difficulty hearing in the presence of background noises
•   Not paying attention to sounds (such as voices, environmental noises)
•   Some people may have no symptoms at all
If hearing loss is detected, it is important to have an evaluation by an audiologist or otologist (doctor who specializes in hearing disorders). Hearing loss can cause problems with a person’s ability to communicate and carry out daily activities. It is therefore very important for a person with hearing loss to find the services that will best help to make the most of their ability to communicate well. There are many options available, and these can be used in various combinations, depending on the hearing problem.

• Hearing aids make sounds louder. Several types are available, depending on the age and size of the person and the extent of hearing loss. It is very important that the hearing aid batteries are fresh and that the hearing aid is turned to the "on" position when in use.
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