This is the whole nature vs nurture. But in my personal thoughts, it is abit of everything. Depression is in the genes for some. I had a good childhood, but I still got depressed. I didn't even think of depression when I was a teen, I just called them my black times or blamed it on my period...whatever was at hand at the time. So in my opinion, it has the propensity to come sometime in our lives. I guess what we do to cope in the end...

Melanie