As dwellers in the same house, it seems only logical that psyche and soma would be interdependent , that well-being in one would promote health in the other, and that illness in one would soon become manifest in its partner. Yet quantifying this intuitive relationship has long been a difficult task. Establishing a mechanism for disease-heart disease, infectious disease, neoplastic disease which can withstand the scrutiny of experimental rigor, is difficult enough. To introduce a seemingly not quantifiable entity such as psychology in the form of stress or anxiety presents such great complexity that for a long time it seemed that the relationship between mind and body would remain a purely speculative one.
Edelstein, MD, Bernard M.
"The Stress Factor: Exploring the Possibility of a Psychological Component to Cancer,"
Jefferson Journal of Psychiatry: Vol. 4
, Article 6.
Available at: http://jdc.jefferson.edu/jeffjpsychiatry/vol4/iss1/6