The uterus gradually increases in size during pregnancy, which increases the abdominal pressure and increases the pressure on the inferior vena cava, especially when the fetal position is not correct, the pressure is more pronounced, causing obstruction of venous reflux in the lower rectum and anal canal, leading to stasis and expansion of the hemorrhoidal plexus; the influence of endocrine hormones during pregnancy can make the pelvic vessels and rectal vessels dilate and aggravate hemorrhoids. In addition, the pregnant woman’s activity is reduced, gastrointestinal peristalsis slows down, which can make the stool stay longer in the intestinal cavity, leading to constipation, and the difficulty of defecation can intensify the onset of hemorrhoids, again, the perineum anger earned during childbirth, can aggravate the obstruction of hemorrhoidal venous reflux, so that the hemorrhoid block prolapse, can not be retracted, pain is obvious, and even thrombosis, affecting the recovery of the body after childbirth, usually after childbirth hemorrhoid disease worsens the mother, most of the pre-pregnancy is already Therefore, it is best for women to receive an examination and diagnosis from anorectal surgery before and after pregnancy.