The Mayo Clinic research group defines Narcissistic Personality Disorder (NPD) as “a mental condition in which people have an inflated sense of their own importance, a deep need for excessive ...

Where mood disorders can cause temporary or fluctuating changes in mood, personality disorders cause symptoms that remain consistent over time and across a range of situations. For example, bipolar ...

Paranoid personality disorder involves a persistent suspicion and mistrust of other people. This can lead to difficulties with functioning socially and in relationships. Treatment for paranoid ...

Genetics is just one of several factors thought to influence personality disorder development. Life experiences, family dynamics, coping mechanisms, and social learning may all be contributing factors ...