This condition has a variety of causes: first, chronic gastroenteritis, patients mostly manifest abdominal discomfort, bloating, reduced food intake, producing less food residues; second, colon, rectal diverticulosis, fecal masses deposited in the diverticulum, easily causing inflammation, stimulating the rectum to cause a sense of bowel movement, stool each time to pull a little; third, slow intestinal peristalsis, peristalsis of the intestine is weakened or intestinal muscle tone is reduced, the amount of defecation is reduced, mostly seen in frail and Constipation, the intake of food is too fine, resulting in less food residue, which is not enough to stimulate the normal peristalsis of the intestine; V. The presence of stenosis or obstruction in the intestinal cavity, resulting in the normal intestinal peristalsis is obstructed, the stool pulling a little, such as intestinal obstruction, left hemicolectomy.