The more smelly the stool is, the better the health is. Normal stool is not usually particularly smelly. Stool is the residual product of digestion and absorption of ingested food in the body, and its odor is related to the type of food eaten, disease and other factors. Normal stool decomposes indole, fecal odor, and other substances, which will produce a certain odor, but usually not particularly smelly. Stool especially smelly may be related to diet, may also be caused by disease. 1, food factors: smelly stool is often seen in the more meat-eating people, due to the decomposition of protein in food indole, fecal odor, hydrogen sulfide and other substances and odor, more malodorous. Consumption of heavy-smelling food may also make the stool more smelly, usually no significant changes in stool properties and frequency of defecation, there is no bloating, abdominal pain and other uncomfortable symptoms; 2, dysbiosis: dysbiosis of the intestinal flora, the reduction of beneficial bacteria may also lead to smelly stools, food digestion can lead to unformed stools, more sour odor, fermentation indigestion, serious dysbiosis can lead to gastrointestinal diseases Appear, you can take probiotics and other drugs under the guidance of a doctor; 3, defecation disorders: such as constipation, gastrointestinal polyps and other diseases, resulting in the accumulation of stool in the intestine for a longer period of time, may also aggravate the smell of stool, usually odor is not very serious, the stool has a dry, hard texture. In addition, gastrointestinal polyps infection, rupture, will also cause foul-smelling stools, there may also be abdominal pain, mucus stool, blood in the stool; 4, gastrointestinal tract infection: the presence of infection in the gastrointestinal tract, bacteria multiplying in the intestines, can cause putrid odor, often accompanied by changes in stool habits. Fishy odor is seen in patients with amoebic enteritis, mostly accompanied by abdominal pain, diarrhea symptoms, and an increase in the number of stools. The foul-smelling stools are often the result of hemorrhagic necrosis and inflammation of the small intestine, with symptoms such as low-grade fever, nausea and vomiting.