Hello PF First a bit about my illness. I have been suffering from Major Depressive Disorder since I was 18 (I am 23 now). The first few years were unbelievably painful and difficult to carry on, and very risky and dangerous (too many suicidal thoughts, sometimes 100+ suicidal thoughts a day). Although at some point I attempted to end that sad painful meaningless life, I could not, I had to come back for the people who love and care for me and thinking about my duties and responsibilities towards them and society. Fortunately I got treatment, passed those scary days and now have NO intention to give up my life. Although I am a lot better now and much recovered but depression is still there and does not seem to go away. It's difficult, I still suffer, but I got used to it. Okay, here are my questions : 1. What causes depression? 2. What happens inside the brain of a person suffering from depression? 3. Is depression linked with OCD? I developed OCD few months prior to my depression. I have a strong feeling my OCD someway lead to depression. 4. Does depression totally go away?