It has been clinically found that women are prone to developing hemorrhoids or worsening symptoms of existing hemorrhoids during pregnancy and childbirth. There are several reasons why women are prone to developing hemorrhoids or worsening symptoms of hemorrhoids during pregnancy and childbirth: (1) The enlarged uterus compresses the blood vessels (inferior vena cava and portal vein), resulting in impaired venous blood return. (2) Compression of the intestinal canal by the enlarged uterus, resulting in obstruction of defecation, hardening of the stool, and increased straining to defecate. (3) Pregnancy hormones such as progesterone and relaxin cause dilatation of pelvic blood vessels and increase arterial blood flow (about 25% increase), while organ tissues in the pelvis and rectal tissues of the anal canal become brittle or flaccid and easily injured or inflamed. (4) Changes in diet and life after pregnancy and reduced activity lead to constipation and poor anorectal blood flow.