Borderline personality disorder (BPD) is a serious mental illness characterised by a persistent pattern of varying moods, low self-image, and challenging behaviours. These symptoms often result in impulsive actions and problems in relationships. People with borderline personality disorder may experience intense episodes of anger, depression, and anxiety that can last from a few hours to days.
Because some people with severe BPD have brief psychotic episodes, experts originally thought of this illness as atypical, or borderline, versions of other mental disorders. While mental health experts now generally agree that the name “borderline personality disorder” is misleading, a more accurate term does not exist yet.