Constipation in late pregnancy is not the exact manifestation of labor. Constipation in late pregnancy is mainly caused by the enlarged uterus pressing on the gastrointestinal tract of pregnant women, which obstructs the peristaltic and emptying functions of the gastrointestinal tract, thus causing constipation symptoms. In addition, the activity of pregnant women is significantly reduced in late pregnancy, which also makes the peristaltic function of the intestinal canal weakened and aggravates the symptoms of constipation. If a pregnant woman’s diet is too homogeneous, her dietary fiber intake is insufficient, or she drinks too little water, it can also cause and aggravate constipation. When constipation is serious in late pregnancy, prolonged squatting or excessive straining during defecation will increase the pressure in the abdominal cavity, which is detrimental to the health of the baby. It is recommended that pregnant women should pay attention to adjusting their dietary structure, eat more coarse fiber foods such as bananas, carrots and sweet potatoes, drink more water and move around appropriately to promote bowel movements.