The authors review the role of psychiatric and behavioral factors in the
practice of medicine in three areas: 1) prevalence of psychiatric
morbidity, 2) the role of behavioral or lifestyle factors in illness onset,
and 3) the overlapping of psychiatric and behavioral factors with medical
illness. Within each areas they review behavioral factors to the practice
of medicine, the limits of current treatment approaches, and future
research needs. In their final section they draw implications for health
care delivery and manpower development.