This textbook of internal medicine is intended for the training of nurses - direct medical assistants, who often conduct independent work. The textbook outlines the methods of clinical and laboratory research of patients, describes individual diseases of internal pathology, which must be known not only in order to reasonably help the patient, but also in order to understand those painful forms, the treatment of which is subject exclusively to medical competence. In addition, the textbook provides reference materials needed in the day-to-day activities of a health professional.