Medicalisation is the process by which human conditions and problems come to be defined and treated as medical conditions, and thus become the subject of medical study, diagnosis, prevention, or treatment.
A personality disorder is a way of thinking, feeling and behaving that deviates from the expectations of the culture. Personality disorders include Borderline Personality Disorder (BPD), Narcissistic Personality Disorder (NPD), Antisocial Personality Disorder, etc.