Very small and fine stools may be related to gastrointestinal disorders, abdominal masses, digestive tract tumors and other factors. 1. Gastrointestinal dysfunction: Gastrointestinal dysfunction leads to weakening of digestion and absorption ability of the gastrointestinal tract, and a large amount of food residue remains in the intestinal tract, which changes the rhythm of emptying and causes a shorter period of time to pass through the rectum, and the phenomenon of small and thin stools will occur. 2. Abdominal mass: If the abdominal mass is large, it can press the intestinal cavity inward and cause narrowing of the intestinal tract, and the stool is squeezed through the narrowed intestinal tract, resulting in the discharge of very small and thin stools. You can improve the abdominal CT and other examinations to make it clear. 3. Tumor in digestive tract: if there is tumor in digestive tract, such as right half colon cancer, rectal cancer, etc., the tumor compresses the intestine to make the intestine become narrow, resulting in very small and thin stool. The patient’s stool may be mucus, pus and blood, which can be clarified by colonoscopy and microscopic biopsy. There may also be other pathological causes for very small stools, so it is recommended to go to the hospital for examination and take corresponding measures.