Pelvic vein stasis syndrome is a special syndrome with chronic pelvic pain as the main clinical manifestation due to chronic pelvic vein stasis. Etiology: 1, anatomical factors: the female pelvis is rich in venous vessels, with a plexiform distribution and thin vessel walls, which makes it easy to form blood stagnation. Circulatory factors: various factors such as prolonged standing, posterior uterus, childbirth, habitual constipation have caused poor blood return and increased pelvic venous load. 3, endocrine factors: ovarian endocrine disorders, estrogen and progesterone ratio imbalance in a certain degree caused. 4, mental factors and others: mental factors have a role in its development.