When borderline was first named back in the 1940's I believe, it was believed to be on the border between psychosis and neurosis, like S4 said. They have come to realize since then that that is not true and there has been a lot of people wanting to change it to something more accurate but so far it has stuck. Plus "borderline" has a bad connotation with a lot of people. We're kind of the "black sheep" of the MH family. Until DBT came out, we were looked upon as being completely incurable and a lot of people in the mental health field haven't really changed their minds. Meds don't work on us. When people with BPD have over-the-top depression, anxiety, etc, they are sometimes given meds to help with those symptoms, but unlike most mental health disorders, our issues are not based on chemical imbalance or what have you. They are learned. There's no easy fix. Yay us!