Part of the concept of health within the WHO definition. It combines the subjective assessment of health both in terms of biological function and self esteem; it also includes a sense of social integration.
Well-being infers achieving social, emotional, and physical potential. It is a key element in the social model of health commonly adopted in the new public health strategies.

Adapted from World Health Organization. Terminology. A glossary of technical terms on the economics and finance of health services. Internet. Accessed December 18, 2015.