Borderline personality disorder (BPD), also known as emotionally unstable personality disorder, is a long-term pattern of abnormal behavior characterized by unstable relationships with other people, unstable sense of self, and unstable emotions.There is often an extreme fear of abandonment, frequent dangerous behavior, a feeling of emptiness, and self-harm. Symptoms may be brought on by seemingly normal events. The behavior typically begins by early adulthood, and occurs across a variety of situations. Substance abuse, depression, and eating disorders are commonly associated with BPD. BPD increases the risk of self-harm and 10% of people affected die by suicide.