직업성 난청은 근로자가 노출되는 환경으로 인해 난청이 발생한 것으로 그 정도는 경도에서부터 심지어 전농까지 발생할 수 있고, 난청의 유형은 전음성, 감각신경성 그리고 혼합성 난청의 모든 형태가 가능하다. 직업성 난청의 경우에는 양측성으로 오는 것이 일반적이지만 편측성으로 올 수도 있다. 원인에 따라서는 소음성 난청이 가장 대표적이나 그 외 주로 중추신경 독성의 특성을 갖는 여러 산업화학물질에 의한 이독성 난청, 음향외상성 난청, 이상기압으로 인한 난청, 외상성 난청으로 분류할 수 있다
"This study performed an epidemiologic investigation of several cases of work-related hearing loss that fell short of acoustic trauma. The cases addressed in this study included sudden deafness, sensorineural hearing loss by noise, and hearing loss mixed with middle ear diseases. In some cases, sensorineural hearing loss was found in workers whose working environments were unchecked or had noise levels estimated to be 85 dBA and less. The levels of exposed noise were unknown in most cases in this study. Moreover, there was a lack of data because most patients did not have regular hearing tests; thus, we only had the most recent test results of theirs. Nevertheless, this study revealed that the patients were exposed to high levels of noise at work and discovered the correlation between hearing impairment and noise exposure. KEY WORDS : Hearing loss, Noise, Noise induced hearing loss(NIHL), Sensorineural hearing loss, Sudden deafness."
\"INTRODUCTION MATERIALS AND METHODS RESULTS DISCUSSIONS AND CONCLUSIONS REFERENCES\"
