It is generally agreed that mucosal ischemia of the gastrointestinal tract is one of the major consequences of the low‐flow state, be it due to blood loss, fluid loss, or sepsis. In the present paper, arguments are presented in favor of the hypothesis that stress‐induced mucosal injury which tends to occur preferentially in the proximal stomach, duodenum, and terminal ileum results from a mucosal energy deficit severe enough to cause cell death.