How to Diagnose and Treat Borderline Personality Disorder! Borderline Personality Disorder (BPD) interferes with someone's ability to regulate emotion. Because of this emotional instability, the individual experiences extreme and sudden mood swings, impulsive behavior, poor self-image, and intense interpersonal relationships. *** Support Us By Rating Us 5 Stars*** **** Please contact us if you have any question! ****, a loved one, or someone you know may have this disorder, then keep reading to know what the criteria in order to be diagnosed with BPD is. *** Support Us By Rating Us 5 Stars*** **** Please contact us if you have any question! ****