Health is the level of functional or metabolic efficiency of a living organism. In humans, it is the general condition of a person‘s mind and body, usually meaning to be free from illness, injury or pain (as in “good health” or “healthy“).^[1] The World Health Organization (WHO) defined health in its broader sense in 1946 as “a state of complete physical, mental, and social well-being and not merely the absence of disease or infirmity.”^[2][3] Although this definition has been subject to controversy, in particular as lacking operational value and because of the problem created by use of the word “complete,” it remains the most enduring.^[4][5] Other definitions have been proposed, among which a recent definition that correlates health and personal satisfaction.^[6][7] Classification systems such as the WHO Family of International Classifications, including the International Classification of Functioning, Disability and Health (ICF) and the International Classification of Diseases (ICD), are commonly used to define and measure the components of health.

Systematic activities to prevent or cure health problems and promote good health in humans are undertaken by health care providers. Applications with regard to animal health are covered by the veterinary sciences. The term “healthy” is also widely used in the context of many types of non-living organizations and their impacts for the benefit of humans, such as in the sense of healthy communities, healthy cities or healthy environments. In addition to health care interventions and a person’s surroundings, a number of other factors are known to influence the health status of individuals, including their background, lifestyle, and economic, social conditions, and spirituality; these are referred to as “determinants of health.” Studies have shown that high levels of stress can affect your health.^[8]