Borderline patients have long reported a higher than expected rate of early
childhood separations and troubled relationships with their parents. More
recent research has highlighted the role of biparental abuse and neglect. H
owever, it has been repeatedly found that sexual abuse is neither necessary
nor sufficient for the development of borderline personality disorder. In
general, all of the research concerning the etiology of borderline personal
ity disorder is consistent with a multifactorial model. Temperamental facto
rs, difficult childhood experiences, and subtle forms of neurological or bi
ochemical dysfunction have all been found to be characteristic and distingu
ishing.