People want to know, why is self-injury so prevalent in borderline personality disorder. According to the National Institute of Mental Health’s website, borderline personality disorder (BPD) consists of unstable moods, behaviors, and relationships, with trouble regulating emotions and thoughts while exhibiting impulsive behavior. Another characteristic of BPD is self-injurious behaviors and increased suicidality. Cutting and other forms of self-harm are so prevalent in borderline that they seem to have become indicators of it. Of course, not everyone who self-harms has BPD, and not everyone with the disorder self-harms. However, it is widely prevalent. And I, myself have been given the borderline diagnosis probably because I cut myself.