Physiological stability is a omnipresent concept in the scientific literature. However, there is a limited number of conceptual definitions of this concept in the literature. A concept analysis of physiological stability is a way to establish the theoretical basis of this multidimensional concept. Its multidimensional character is illustrated by the multiples uses of the concept. Identifying the attributes, the antecedents, and the consequences of the concept of physiological stability leads us to develop a conceptual definition. The aim of this article is also to develop a discussion of the use of the concept, without initially defining it.