Personality disorders are a type of mental disorder in which individuals have a rigid and unhealthy pattern of thinking, functioning, and behaving. The three individual case studies presented in the following chapter have trouble perceiving and relating to situations and people, causing significant problems in relationships, social activities, and the workplace.

This chapter features five cases from across the Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM-5) and may be used as a final review. There is diversity in clientele, diagnosis, and treatment modality and may help students demonstrate their skills in diagnosis and treatment of mental health disorders.