Modern medicine continues to confront controversies regarding the interaction of nature and nurture; that is, how significant are the contributions of environment or genetics to illness. Does the heart attack developing in the 48-year-old man devolve more from his increasing weight and fondness for french fries or from a genetic predisposition? Most doctors believe some combination of genetic vulnerability and environment inform disease.
Borderline Personality Disorder (BPD) is often associated with past emotional and physical trauma. It also appears to be linked to BPD and other disorders, such as depression, in blood relatives. Some individuals who have experienced severe trauma never exhibit BPD symptoms; and some who have been reared in healthy environments without crises demonstrate severe BPD pathology.