Noise-induced hearing loss (NIHL) is hearing loss caused or contributed to by exposure to excessively loud sound, either suddenly or through repeated exposure over time.
Very loud sound can damage delicate structures within the inner ear. Repeated exposure can cause gradual, often permanent hearing loss, while an exceptionally intense sound may cause injury after a single exposure.
NIHL commonly affects the ability to hear certain frequencies and may make speech harder to understand, particularly in noisy environments. Once significant permanent sensory damage has occurred, the lost hearing generally cannot be restored naturally.
NIHL is preventable in many cases through measures such as reducing sound levels, shortening exposure time, increasing distance from loud sources, and using appropriate hearing protection.
QUICK FACT
Noise-induced hearing loss can develop gradually, so a person may not notice the change until communication becomes difficult.
COMMONLY CONFUSED WITH
- Temporary threshold shift: a temporary reduction in hearing sensitivity after noise exposure.
- Tinnitus: perception of sound without an external sound source; it can occur with NIHL but is not synonymous with it.
SEE ALSO
