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Stress is “the nonspecific response of the body to any demand made upon it,” that is, the rate at which we live at any one moment. All living beings are constantly under stress and anything, pleasant or unpleasant, that speeds up the intensity of life, causes a temporary increase in stress, the wear and tear exerted upon the body. A painful blow and a passionate kiss can be equally stressful.
Hans Selye (Fri,) studied this question.