The book aims to cover a broad range of topics related to anxiety disorders, including symptomatology, etiology, epidemiology, diagnostic features, comorbidity, clinical neuroscience, genetics, neuroanatomy, neuroendocrinology, neurochemistry, animal models, translational science, functional neuroimaging, and preclinical and clinical psychopharmacology. The book aims at bringing these disciplines together to provide an update of the field and outlook to the future. Therefore, it will be of use to both the non-clinical and clinical expert, who may use it as a detailed reference book, and the novist to the field, to whom it may serve as an introductory text, providing an overview.