Borderline personality disorder is a complex mental health condition. Those with the condition have unstable moods, a history of difficulty functioning in relationships, and a dysfunctional self-image. Patients have emotional dysregulation that can lead to impulsive behaviors, self-harm, and fear of abandonment and have significant challenges in life that can lead to poor psychosocial outcomes. Interpersonal relationships can often be intense and dysfunctional and demonstrate frequent conflicts. Emotional dysregulation can lead to rapid and intense mood swings. Impulsivity can lead to issues such as reckless spending, risky sexual behaviors, and substance abuse. The treatment of borderline personality disorder is largely through long-term psychological therapy and the gold standard therapy approach is dialectical behavior therapy. This therapy focuses on optimizing emotional regulation, distress tolerance, interpersonal effectiveness, and mindfulness skills.