Bloomberg View is doing a three part excerpt from my book. One of the comments on the first part, was "What Causes It?"
The answer, most of the time, is Noise. By far the majority of hearing loss is the result of noise exposure. Chapter 3 of my book is all about our love affair with noise. As I did the research I became more and more astonished -- and incensed -- at the noise we inflict on ourselves.
Here's the link to Bloomberg View.