The main reasons for sour stools are the following: 1, dietary factors, such as long-term or excessive consumption of spicy, stimulating, fried, barbecued, high-fat, high-sugar, and high-protein endoplasmic food. As the stool in the intestine, the bacterial decomposition of more ammonia substances, so that the discharge produces a more intense odor. 2, the intestinal tract inflammation and inflammatory diseases of the intestine, such as various causes of enteritis, gastritis, and Crohn’s disease, ulcerative colitis, etc., can make the intestinal flora dysbiosis, so that the absorption function is abnormal, causing incomplete decomposition of food in the intestine, the discharge produces a more serious odor. 3, constipation, due to constipation when the stool in the intestinal tract for too long, stool in the decomposition of bacteria, as well as stool in the intestinal tract silt, so that the discharge of the stool produces a more obvious odor. 4, malignant tumors of the intestine, malignant tumors in the intestine in its larger size, will cause complete or incomplete obstruction of the intestine, so that the stool in the intestine for too long, bacterial decomposition caused The foul smell of stool is heavier.