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Etiology

Biological

~ Genetics

- Genes inherited from ones parents might make you more vulnerable to developing borderline personality disorder

- Norwegian study of identical twins = Heritability of 42 percent

- Chromosome 9 highest linkage rate

~ Neurotransmitters or "messenger chemicals" responsible for reg. of sleep, learning, and mood may be at lower levels

~ Brain/Prefrontal cortex

- Prefrontal cortex may be smaller or less developed than most (regs. emotions, self control, and behavior)

Environmental

~ Childhood events & Social/cultural surroundings play great role in personality development

- Unstable family relationships

- Childhood neglect/abandonment

- Chronic intense stress & fear

~ Childhood trauma

- Sexual/Emotional/Physical Abuse

& - Brain formation also shaped by environment

Risk Factors

- Childhood abuse

- Brain abnormalities

- Direct relative with mental health disorder

- Hereditary predisposition

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