This document provides information on borderline personality disorder (BPD), including a case presentation, diagnostic criteria, associated features, prevalence, etiology, course, differential diagnosis, and treatment approaches. The case involves a 17-year-old female with a history of self-injurious behaviors, mood swings, insomnia, and anger issues. Upon examination, she displays impulsivity, impaired judgment, and an unstable self-image. Her mother also has BPD. The document outlines the diagnostic criteria for BPD and discusses cognitive-behavioral therapy and dialectical behavior therapy as evidence-based treatment options.