Which disorders are included in the differential diagnosis for Borderline Personality Disorder?

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When evaluating Borderline Personality Disorder, clinicians look for other conditions that can imitate its mood and behavior patterns, especially mood disorders with fluctuating affect. Major depressive disorder and bipolar I disorder are key parts of the differential because the mood instability, rapid shifts in affect, and impulsive behaviors seen in BPD can resemble mood episodes in these disorders. Mania or hypomania in bipolar disorder can be mistaken for the heightened arousal and risk-taking aspects of BPD, while depressive episodes can mirror the depressive symptoms that sometimes appear in BPD presentations. While generalized anxiety disorder, schizophrenia, and PTSD may share some overlapping features such as anxiety or dissociation, they tend to present with patterns that are distinct from the pervasive, unstable self-image and relationships that define BPD. Thus, the most notable and commonly considered differential alongside BPD’s core features involves major depressive disorder and bipolar I.