The concept of health is evolving over time. Traditional paradigms of health, with disease being the central focus, have emerged into complex, multidimensional models centering on a positive, holistic approach towards the phenomenon of health. The subsequent emphasis on health promotion has concomitantly affected the concept of nursing. The concept of health is a basic building block for nursing theory. How health is defined dictates how nurses should be educated and how they should practice. Incorporating the self-care model of nursing practice, health is conceived of as the effective functioning of self-care resources which ensure the operation and adequacy of self-care actions.