The typical dysfunctional beliefs and maladaptive strategies expressed in personality disorders make individuals susceptible to life experiences that impinge upon their cognitive vulnerability. Thus, the dependent personality disorder is characterized by a sensitivity to loss of love and help; the narcissistic by trauma to self-esteem; the histrionic by failure to manipulate others to provide attention and support. The cognitive vulnerability is based on beliefs that are extreme, rigid, and imperative. We speculate that these dysfunctional beliefs have originated as the result of the interaction between the individual’s genetic predisposition and exposure to undesirable influences from other people and specific traumatic events.