Chapter 17: Mental and Physical Health

The chapter then presents the DSM-5 organizational framework, which categorizes personality disorders into three distinct clusters: Cluster A encompasses odd and eccentric presentations, Cluster B includes dramatic and emotionally erratic patterns, and Cluster C comprises anxious and fearful manifestations. Rather than relying solely on categorical diagnoses, the chapter introduces the dimensional approach through the "Big Five" maladaptive traits model, which identifies negative affectivity, detachment, antagonism, disinhibition, and psychoticism as core dimensions underlying personality pathology. A significant portion of the chapter explores how personality traits predict physical health and longevity, moving beyond the traditional separation of mental and physical medicine. The relationship between Type A personality and cardiovascular disease receives particular attention, with the chapter clarifying that hostility and cynicism—rather than ambition or competitiveness—constitute the truly problematic elements associated with increased heart disease risk. Conscientiousness emerges as a protective factor, with research demonstrating that conscientious individuals tend to live longer due to their engagement in health-promoting behaviors, better adherence to medical recommendations, and reduced engagement in risky activities. The chapter establishes that psychological well-being operates as a bidirectional influence on physical health, meaning that mental health interventions can improve physiological outcomes and vice versa. Throughout, the material emphasizes the integrated nature of personality and health, challenging students to recognize personality psychology as fundamental to understanding human illness and wellness rather than as a separate academic domain.