The book, based on a generalization of literary data and the authors’ own observations, presents the morphological signs of toxic damage identified at the stage of sectional research. A special feature of the presentation is the separate presentation of the morphological signs of toxic damage observed in various organs and systems. Both changes that occur under the influence of individual toxicants and morphological criteria for syndromes that develop during exogenous intoxications are presented. The book is intended for forensic doctors, pathologists, clinical toxicologists, as well as doctors of other specialties who deal with acute poisoning in practice.