The author observes that, apart from K. Dabrowski, four major North American Psychological theorists now view the positive aspect of psychological disequilibrium, namely: E. Erikson, E. Shostrom, R. May and V. Frankl (from Vienna and San Diego). Having compared the particular way in which each of the mentioned authors approaches this positive aspect and noted their interrelationship, he argues that it becomes necessary to change the meaning of the concepts of health and disease as related to psychological disequilibrium. A new definition of these concepts is thus offered and illustrated.