Some people's depression is triggered by an event, a major loss or a tragedy. My first depressive episode had no inciting incident. It happened slowly and all at once. The sadness and dread was overwhelming. I couldn't stop crying. I stopped going out. I stopped talking to my roommates. I hated everything and everyone. I skipped classes. I stopped eating. I thought about suicide and I started cutting.
For me, the scariest part of depression is when the tears stop and the numbness sets in. You start to wonder if you'll ever feel anything again or if you're doomed to walk through the rest of your life like a zombie. It was when the numbness had enveloped me that I cut for the first time.