Yes I agree with Sannah. I see it as the result of development that is disrupted or incomplete. When we don't get what we needed *when* we needed it, it affects our personality and shows up in our perceptions, our internal experiences, and especially our relationships (from avoiding them to troubled ones).

In therapy, my therapist and I talk about things I experience now and follow the possible trail to unmet needs during developmental years. It's very interesting to explore and helpful too.