Diarrhea is reported as a major complication of enteral feeding. Recen
t studies show that there is a staggering amount of confusion in defin
ing diarrhea in this setting. This causes major problems both in estim
ating the incidence of diarrhea, as well as determining its clinical i
mpact In many cases, careful review of the patients' records and evalu
ation of the diarrhea may lead to ifs accurate diagnosis and treatment
The frustration involved in the management of these patients may lead
investigators to measure quantitatively the patient's fecal output an
d to come up with a standardized definition of diarrhea. We describe h
ere three cases that show various forms of enteral feeding-induced dia
rrhea. Subsequently we will review the important issues regarding the
definition of related diarrhea and attempt to understand ifs pathogene
sis.