Borderline personality disorder is a serious mental illness, which usually stems from some form of childhood trauma, abandonment, neglect, or abuse. Over time the effects of these childhood occurrences cause a skewed sense of self. Most sufferers of this disorder will at some point think about or attempt suicide, and should be treated as soon as possible. For a look at 7 warning signs and symptoms of borderline personality disorder, which you should be wary of, read on below.