What are acoustic trauma and noise induced hearing loss?
Acoustic trauma occurs when any excessive sound energy strikes the inner ear. If it is brief, the noise may cause a reversible, temporary auditory fatigue, technically known as a temporary threshold shift. For example, after a loud rock concert, it is common to experience hearing dullness and ringing for several hours. In this situation, if symptoms persist beyond several days, oral steroids (cortisone-type medications) may help the inner ear recover. If the noise is loud enough and the duration of exposure long enough, however, it may cause a permanent threshold shift. This condition is called noise induced hearing loss, and has no cure and is irreversible. Hearing loss produced by a sudden and very loud noise (blast injury) is called acute acoustic trauma. If the sound is loud enough, it can cause the eardrum to rupture or the person to have a complete loss of hearing. Sometimes, particularly if the sudden loss is total and combined with dizziness, immediate surgical exploration of t
