It's hard to say. I've had it ever since I can remember, even as a child. I believe my father had it pretty strongly as well, so I've inherited it somewhat.

Some of mine is situational (because of my young life beliefs, I haven't had a lot of good things happen, or allowed them to anyway), and I have had some terrible luck.

Again, it's hard to say - I would say mine is a combination of genetic, anatomical, and reactive.