If you cut yourself, fall off a scaffold, or even whack your thumb with a hammer, chances are you'll know you've been injured. But every day untold numbers of construction workers suffer irreversible damage to their hearing and have no idea they are being harmed. Unlike other occupational injuries, noise-induced hearing loss (NIHL) causes no immediate pain or trauma, leaves no scars or bruises, and is unnoticeable in its early stages. Damage compounds with each additional overexposure, and the hearing loss is permanent.
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