Borderline personality disorder (BPD), also known as emotionally unstable personality disorder (EUPD), is a Cluster B Personality Disorder characterized by poorly regulated responses in five main areas: emotions, behaviors, interpersonal relationships, sense of self, and cognition. BPD is perhaps the most heavily stigmatized mental health condition both in the media and the psychiatric field.
Up to 6% of the population is reported to be affected with BPD in a given year. The male to female ratio of people diagnosed with BPD is 1:3, and it appears to become less common among older people.
The behaviors that characterize BPD typically begin by early adulthood, occur across a variety of situations, and may be triggered by events considered normal to others. BPD commonly coexists with other conditions such as substance abuse, major depressive disorder, and eating disorders.