In this important edition of "Modern Psychiatry" presented by VITA Medical Publications and Professors of Psychiatry G.N. Papadimitriou, I.A. Liappa, and E. Lykoura, more than 100 experienced and renowned authors participate. Most of them have multiple contributions to the individual chapters. The established educational rules are followed, while regarding psychopathological conditions, the sequence of chapters does not differ from the order followed by the latest diagnostic classification systems. The textbook consists of eleven thematic units, which fully cover the General framework of Psychiatry, the nature and contribution of Psychology and Neuropsychology to the evolution of Medicine, various classification issues, psychiatric examination and diagnosis, as well as laboratory tests. The authors also analyze the significant doctor-patient relationship, higher cognitive functions and their disorders. They describe the etiology of mental disorders, Psychiatric nosology, psychological and biological therapies commonly used in psychiatric therapy, social-community Psychiatry, Subspecialties of Psychiatry (such as Child Psychiatry, Geriatric Psychiatry, Liaison Psychiatry, Substance Abuse Psychiatry, and Forensic Psychiatry), the relationship between Psychiatry and society, as well as Preventive Psychiatry and various education topics in Psychiatry. The present book is primarily addressed to Medical students, but it will also be useful to postgraduate students in the cognitive subjects of Psychiatry and related sciences. However, it is also of interest to trainee and specialized psychiatrists, psychologists, and other mental health professionals. Moreover, it undoubtedly contributes to the promotion of mental health of the population, the assurance of which is a social good, therefore a priority of the State and a testament to the culture of a country.