http://www.borderlinepersonalitydisorder.com/what-is-bpd/bpd-overview/ Making for Diagnosis Unfortunately, BPD is too often misdiagnosed. Some people who have borderline personality disorder are misdiagnosed with bipolar disorder. There are important differences between these conditions but both involve unstable moods. For the person with bipolar disorder, the mood changes exist for weeks or even months. TheContinue Reading