DefinitionPersonality disorders are a group of psychiatric conditions in which chronic behavior patterns cause serious problems with relationships and work.Causes, incidence, and risk factorsThe exact cause of personality disorders is unknown. However, many genetic and environmental factors are thought to play a role.Mental health professionals categorize these disorders into the following types:Antisocial personality disorderAvoidant personality disorderBorderline personality disorderDependent personality disorderHistrionic personality disorderNarcissistic personality disorderObsessive-compulsive personality disorderParanoid personality disorderSchizoid personality disorderSchizotypal personality disorderSymptomsSymptoms vary widely depending on the specific type of personality disorder.P