Top 10 Causes of Hearing loss.    1.  Ongoing Exposure to Noise on the Job Long-term exposure to continuous loud noise can cause lasting hearing loss. A common culprit is workplace noise, like machinery. About 30 million Americans face hazardous levels of noise at work. Things like motorcycles and power tools also can damage hearing over time. If you can, avoid or take breaks from noisy activities. Wear earplugs or ear protectors that fit over the ear. 2. Injury or Pressure Changes