What Is a Personality Disorder? Symptoms of Borderline, Histrionic, Narcissistic & Other PDs

Personality disorders are mental health conditions like borderline, histrionic, narcissistic, or antisocial personality disorder that cause unhealthy patterns of thought and behavior. Though they occur in one out of every ten adults, personality disorders remain largely misunderstood. Here, we review the symptoms, types, causes, and treatments of Cluster A, B, and C PDs.