This book aims at providing the reader with an introduction to psychiatry and to the study of mental disorders. While still addressing basic theoretical concepts of importance for the understanding of psychiatry as a specific field of knowledge, its main focus is not an extensive discussion or a comprehensive review of research findings. Instead, whenever possible, the different topics are addressed from a practical point of view, allowing the reader not only to expand their base knowledge but, most importantly, to obtain a good picture of how patients experiencing these conditions usually present themselves in clinical contexts. Moreover, the treatment of mental disorders is addressed in an objective, straightforward way, based on the respective authors’ own clinical experience in the management of a high number of patients, in different settings.