Bipolar and Borderline Personality Disorder: The Bottom Line
So far, there is not enough research to suggest that BPD and bipolar disorder are related. Although there are definitely some shared features, there are also some marked differences between BPD and bipolar disorder. Also, the co-occurrence of BPD and bipolar disorder is not large enough to suggest that the two disorders are related. However, more research is needed on this topic. It may be that future research, for example on the genetic and biological causes of BPD and bipolar disorder, may reveal some undiscovered elationships between the two conditions.
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Gunderson JG, Weingberg I, Daversa MT, Kueppenbender KD, et al. “Descriptive and Longitudinal Observations on the Relationship of Borderline Personality Disorder and Bipolar Disorder.” American Journal of Psychiatry, 163:1173-1179, 2006.
Paris, J. “Borderline or Bipolar? Distinguishing Borderline Personality Disorder from Bipolar Spectrum Disorders.” Harvard Review of Psychiatry, 12:140-145, 2004.