The complete reference book contains all the most necessary information on caring for patients and providing assistance in extreme situations involving a threat to life and health. The technique of basic medical procedures is clearly shown, and recommendations are given for their implementation in a medical institution and at home. The principles of rational care for sick and healthy people in different life periods are discussed in detail. The reference book describes the basic elements of hygiene and self-hygiene in all age groups. Professional doctors provide information on disease prevention, proper nutrition, physical activity, and formation of a daily routine in order to maintain long-term health. The publication is relevant for nurses, teachers and students of medical schools and colleges, as well as a wide range of readers.