Eustress is created through a focus or perception that the stress one is experiencing is or may be helpful. Yes, our perception of pressure has a huge effect on the amount of stress we experience. So it is right to have strain? Hans selye, a hungarian scientific endocrinologist coined the time period eustress. Dr. Selye is taken into consideration by means of many to be the daddy of studies and take a look at on the subject of stress. He constructed the largest database of stress literature on the earth. This pioneer of strain studies said, "strain is the salt of life.