God is an idea.

Well, Depression is obviously caused by problems in your life, they may be real problems or sometimes they are problems you make for yourself by just seeing them as problems.
But not every person with the same problems will be depressed. I think you have to have the tendency to depression, having problems alone is not enough.

Luckily today we have very good medications, i take cipralex and wellbutrin and they both seem to be helping a lot