Occupational Hearing Loss

Occupational hearing loss is damage to the inner ear from noise or vibrations due to certain types of jobs or entertainment.

Causes

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 range that can damage hearing.

Some jobs carry a high risk for hearing loss, such as:

Airline ground maintenance
Construction
Farming
Jobs involving loud music or machinery

In the U.S., the maximum job noise exposure is regulated by law. Both the length of exposure and decibel level are considered. If the sound is at or greater than the maximum levels recommended, protective measures are required.

Symptoms

The main symptom is partial or complete hearing loss. The hearing loss may get worse over time.

Sometimes hearing loss is accompanied by noise in the ear (tinnitus).

Exams and Tests

A physical examination will not usually show any specific changes. Tests that may be performed include:

Audiology/audiometry
CT scan of the head
Head x-ray

Treatment

The hearing loss may be permanent. The goal of treatment is to improve any remaining hearing and develop coping skills (such as lip reading).

Using a hearing aid may improve communication. Always protect the ear from further damage. For example, wear ear plugs in noisy areas.

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