The person who wants to have a bowel movement when he is nervous belongs to one kind of performance of irritable bowel syndrome, and its main reasons are as follows: 1, due to the abnormality of cerebral-intestinal axial neural regulation, which leads to the abnormality of the central nervous system’s intestinal regulation. 2, the abnormality of visceral sensation, due to the decrease of the visceral sensory threshold to the stimulus, the sensation of wanting to have a bowel movement can appear after the nervousness of the eating as well as the environmental changes. 3, intestinal infections, due to the decrease of the sensory threshold to the intestine, and more sensitive to inflammatory stimuli. 3, intestinal infection, due to the intestinal sensory threshold decreased, more sensitive to inflammatory stimuli, when the intestinal infection of inflammatory stimuli, accompanied by brain-intestinal axis neuromodulation abnormality, there will be a phenomenon of nervousness on the stool. 4, intestinal dysfunction, due to the intestinal neuromodulation abnormality, mainly to the intestinal hyperdynamic as the main manifestation of intestinal hyperdynamics, intestinal peristalsis increase in nervousness, then there will be a nervousness on the feeling of wanting to poop.