Borderline personality disorder (BPD), also known as emotionally unstable personality disorder (EUPD), is a mental illness characterized by a long-term pattern of unstable relationships, a distorted sense of self, and strong emotional reactions. There is often self-harm and other dangerous behavior. People may also struggle with a feeling of emptiness, fear of abandonment, and detachment from reality. Symptoms may be triggered 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. Up to 10% of people affected die by suicide.