The Greek theory positing four essential bodily fluids (blood, black bile, yellow bile, phlegm)
Early cultures believed disease was caused by these entering the body, sometimes addressed by trephination
In the Middle Ages, disease was attributed to these forces, and religion was associated with health
This Renaissance concept, introduced by Descartes, separated the mind and body
A key function of the World Health Organization related to guidance for governments
Understanding psychological influences on staying healthy, getting ill, and responding to illness defines this field
The World Health Organization defines this as a state of complete physical, mental, and social well-being
