The feeling of anal distension in late pregnancy is not necessarily about to give birth, but may also be caused by the descent of the fetal prelude or aggravation of hemorrhoids. The feeling of anal distension in late pregnancy is not necessarily about to give birth, but may also be due to the fetal prelude descending into the pelvis, the pelvic floor tissue compression caused by aggravation of hemorrhoids, or late pregnancy due to the increasing uterus on the pelvic floor compression aggravation of hemorrhoids and cause, at this time, is not accompanied by contraction pain, can be through the physical examination and prenatal examination can assist in the diagnosis. Regular contractions in late pregnancy began to enter the labor process, and after the opening of the uterus due to the fetal first dew drop pressure on the pelvic floor tissues, so that the mother appeared to be obvious anal swelling feeling of defecation, but also involuntarily downward breath holding force, and at this time there is also perineum swelling, anal sphincter relaxation, is the performance of the imminent delivery, the need to be ready to deliver the baby.