What does the “borderline” in BPD mean?
Though not overly descriptive of the illness, it means “on the border between neurotic and psychotic”; in other words, even though it is a very destructive illness, sufferers can appear to be deceptively functional. It wasn’t meant to mean “bordering on other mental illnesses”, even though that’s how BPD is often perceived, sort of a fuzzy mix of several mental problems.