Latest classifications led to an inflamed debate urging for change or validation in the way personality disorders are classified. The placement in psychiatric classifications of several personality disorders, particularly Borderline Personality Disorder (BPD), is also a matter of discussion.

The present work aims to question BPDs place in classification alongside with other personality disorders, rather than focusing on the algorithms used to classify it. The authors review updated literature on core features of the disorder collected from online scientific databases.

Studies reveal that the stability of the diagnosis of BPD over the longer term is less than what standard general definitions of personality disorders would appear to require. It is a chronic and debilitating syndrome with severe functional and psychosocial impairment that remain relevant when comparing to other personality disorders. Additionally, these measures show further declines over time in spite of improvement in psychopathology, in contrast to what happens with other personality disorders. Several misconceptions may have led to the placement of BPD on former axis II, namely being a direct consequence of trauma and merely explained by environmental factors. However, recent research on heritability shows the contrary and several neurobiological markers suggest it has got a nature of its own.

BPD is probably the most studied and validated personality disorder and has substantially greater empirical basis, clinical significance and public health implications, being both enduring and distinct from other personality disorders. We suggest the placement of BPD as major psychiatric disorder in classifications.

The authors have not supplied their declaration of competing interest.