Cross-cultural bias in the diagnosis of borderline personality disorder.

Borderline personality disorder (BPD) is an internationally recognized disorder, although it is slightly varied in its nosology in the International Classification of Diseases, 10th Revision (ICD-10), the Diagnostic and Statistical Manual of Mental Disorders, 5th edition (DSM-5), and the Chinese Classification of Mental Disorders (CCMD). While it is recognized by genetic and neurobiological patterns, instability of affect, impaired interpersonal relationships, and unstable sense of self, its manifestation is extremely varied based on environmental factors, particularly culture. Several studies of the manifestation of BPD between and across countries, particularly in immigrant populations, identify variations in symptom prevalence based on culture. These findings reveal a need for more unified dimensional-based categorization of BPD to reduce cross-cultural bias and improve identification.