Historically, pain has been associated with many different meanings an
d views about its causes and appropriate treatment. Nurses have contri
buted to pain knowledge through research on psychosocial variables aff
ecting the pain experience, assessment and intervention practices, und
erstanding patient and family meanings of cancer pain, and sytematic s
tudies of pain intervention programs. Nurses also have been leaders in
promoting public policy on effective pain management and in implement
ing and evaluating innovative programs on pain management in a variety
of healthcare institutions and agencies.