What about the hereditary link? 

My grandfather had undiagnosed Cushing's as well as my mother, that's where mine has stemmed from, I believe. My grandfather was exposed to fumes at the Railroad yard where he worked as first a switchman than up to General Manager.

My mother used to visit him there regularly, however I did not. I could see him contracting something like Cushing's from his exposure to the fumes from the Railroad cars and engines, but what about me who has never really been exposed to much the last few years?

Mari