Public health refers to "the science and art of preventing disease, prolonging life and promoting
health through organized efforts and informed choices of society, organizations, public and private, communities and individuals." It is concerned with threats to health based on population health analysis. The population in question can be as small as a handful of people, or as large as all the inhabitants of several continents (for instance, in the case of a
pandemic). The dimensions of health can encompass "a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity", as defined by the United Nations'
World Health Organization. Public health incorporates the
interdisciplinary approaches of
epidemiology,
biostatistics and
health services.
Environmental health,
community health,
behavioral health,
health economics,
public policy,
insurance medicine and
occupational safety and health are other important subfields.