Depression is NOT biochemical! All spiritual..repressed resentment equals depression.
Sorry, but in many cases it is. Yes, there are trauma issues that can trigger it, but there is also a lot of evidence of chemical imbalances that can trigger it. Common examples are things like postpartum depression which is triggered by massive hormonal changes after giving birth.
We are biochemical factories and everything we feel is controlled in some form or another by chemicals. There aren't mysterious little bugs in us that turn switches on and off to trigger feelings and emotion, it is all chemical. Even trauma triggers chemical reactions that result in PTSD.