Occupational hearing loss is when someone gets too much sound in their ears over a long period of time that damages their hearing. This can happen when a person works in a loud place, like a factory with loud loud machines. The loud sound damages the tiny hairs in the ears that help send sound to the brain. When these tiny hairs get damaged, they don't work so well and it is harder to hear. Sometimes occupational hearing loss is permanent and the person can never hear normally again. It is important for people in loud places to protect their ears with things like earplugs and special headphones.