The causes of postpartum constipation: 1, puerperium gastrointestinal function is weakened, slow intestinal peristalsis, intestinal contents stay in the intestine for a long time, so that water absorption caused by dry stools. 2, after pregnancy abdominal over-expansion, so that the abdominal muscles and pelvic floor tissue relaxation, defecation power is weakened. 3, after the birth of the body weak defecation power is weakened, so there is often constipation after delivery. 4.The diet structure is not reasonable, and the vegetables and fruits are not eaten.