Some factors related to personality development can increase the risk of developing borderline personality disorder. These include:

  • Hereditary predisposition. You may be at a higher risk if a close relative — your mother, father, brother or sister — has the same or a similar disorder.
  • Stressful childhood. Many people with the disorder report being sexually or physically abused or neglected during childhood. Some people have lost or were separated from a parent or close caregiver when they were young or had parents or caregivers with substance misuse or other mental health issues. Others have been exposed to hostile conflict and unstable family relationships.
  • Personality. Personality traits that include impulsiveness and aggression may play a role in the development of borderline personality disorder.
July 30, 2015