Stool is particularly smelly due to excessive intake of protein, indigestion, dry stool or intestinal diseases, as follows: First, excessive intake of protein, if the intake of too much fish, eggs, milk and other high-protein food, the body can not be completely digested, absorbed, part of the protein by the intestinal flora decomposition, utilization, the process will produce ammonia, indole, sulfide and other smelly substances, so the stool will be particularly smelly. Second, poor digestion, digestive function of the gastrointestinal lower, eat into the food can not be digested and absorbed in a timely manner, a large number of stagnation in the body, excessive fermentation will produce odor. Third, dry stool, stool water content is low, in the intestinal tract for too long in the retention of odor, so patients with constipation stool usually with odor. Fourth, intestinal diseases, common bacterial enteritis, Crohn’s disease and ulcerative colitis.