The study guide presents the results of research on emotional and bodily stress, conducted by the author over the years. Changes in emotions and behavior of different people under short and long-term stress are analyzed. From the position of pathopsychology, alexithymia (“lack of words of feelings”) and the phenomenon of “splitting of emotions” are considered. "Engine Storm" and "Imaginary Death" were studied in battles in the North Caucasus. The results of the author's fundamental studies of the "sickness disease" syndrome and methods of its prevention are presented. Particular attention is paid to how psychological stressors affect the vegetative sphere (physiological systems) of the body. Methods and techniques for maintaining health and performance under stress are shown.For students, graduate students and teachers of psychology, psychophysiologists, medical, military, marine psychologists, and everyone affected by stress.