This case study analyzes the application of the biopsychosocial model in nursing care for a 30-year-old male patient, Matthew, diagnosed with borderline personality disorder (BPD). The assignment explores the interplay of biological, psychological, and social factors influencing the patient's condition. Biological factors, including genetic predispositions and substance use disorder, are considered, along with the potential use of medications like mood stabilizers and antipsychotics. Psychological aspects such as childhood trauma and self-harm are addressed, with recommendations for therapies like cognitive behavioral therapy and psychotherapy. Social factors, including relationships and past abuse, are examined for their impact on the patient's mental well-being. The nurse's role in providing holistic care, patient education, and fostering a positive environment is emphasized, highlighting the comprehensive approach of the biopsychosocial model in treating BPD.