Recent findings from an American research team indicate that doctors may underdiagnose cases of borderline personality disorder (BPD) and overdiagnose cases of bipolar disorder, a second severe mental health condition that has certain features in common with BPD.
Doctors and researchers are well aware that borderline personality disorder and bipolar disorder share an overlapping set of symptoms. In fact, the two conditions sometimes appear together in the same individual. In a study review published in January 2015 in the journal Borderline Personality and Mood Disorders, researchers from two U.S. institutions sought to determine if cases of BPD are underdiagnosed by American doctors. They also sought to determine if doctors overdiagnose the presence of bipolar disorder.