What is a common symptom of borderline personality disorder?

Intense and unstable interpersonal relationships are indeed a hallmark symptom of borderline personality disorder (BPD). Individuals with BPD often experience significant fluctuations in their relationships, swinging from idealization to devaluation of others, which can lead to tumultuous interactions. This instability is typically due to their intense emotions, fear of abandonment, and difficulty in regulating their feelings.

In contrast, excessive self-criticism, while it may be present in some individuals with BPD, is not as central to the disorder as the instability in relationships. Long-term mood stability is contrary to the emotional dysregulation commonly observed in BPD, where mood swings can be sudden and drastic. Consistent conformity to social norms also does not characterize BPD, as individuals may struggle with their identity and may act out in ways that defy social expectations. Thus, the focus on interpersonal relationships captures the essence of the disorder effectively.