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On the other hand, borderline personality disorder involves a complex web of emotional, behavioral, and identity disturbances. While mood swings are prominent, they are not the primary clinical feature. Instead, BPD is characterized by intense fear of abandonment, unstable interpersonal relationships, impulsivity, and a persistent sense of emptiness. The mood changes are often reactive responses to perceived threats or conflicts, rather than intrinsic mood cycles. This fundamental difference explains why someone's emotional state in BPD can be unpredictable and reactive, making relationships particularly turbulent.