Anxiety Disorders

This chapter discusses the similarities, differences, and comorbidities between depression and anxiety disorders broadly defined, including generalized anxiety disorder, social anxiety disorder, specific phobias, panic disorder, obsessive-compulsive disorder, and post-traumatic stress disorder. The high level of comorbidity between anxiety disorders and depression is explicated, and the negative consequences of this comorbidity, including higher severity, functional impairment, and worse response to treatment, are discussed. Major theoretical models for differentiating anxiety and depression, including the tripartite model, the integrative hierarchical model, and the quadripartite model, are explained. Translational research, including neurological, psychophysiological, and genetic underpinnings of the similarities and differences between anxiety and depression, is reviewed. The chapter concludes with broad treatment implications and recommendations.