1. Irregular vaginal bleeding. The symptoms are increased menstrual flow, irregular menstruation, and intermittent bleeding during menstruation. The clinical symptoms may be prolonged menstruation and laxity, or a small amount of vaginal bleeding 3~4d after menstruation; or frequent mid-menstrual bleeding; or bloody leucorrhea, in short, the clinical manifestations vary, even without any clinical symptoms, only auxiliary examination can indicate the presence of endometrial polyps. 2, infertility. Endometrial polyps occupy the uterine cavity, and as a “foreign body” affect the contraction of the uterus, and abnormal bleeding can affect the fertilization of eggs and development; or polyps located in the cervical canal, before the mouth of the fallopian tube can affect the passage of sperm, affecting the upward movement of sperm, resulting in infertility; in addition, endometrial polyps due to the lack of progesterone receptors and the loss of response to progesterone, In addition, endometrium polyp can not be transformed into secretory endometrium due to the lack of progesterone receptors, which can affect the fertilization of eggs and lead to infertility. 3.Malignant change. The malignancy rate of polyps at the reproductive age is only 4.8%, but it can increase to 10% after menopause. Different studies found that 13.2% of endometrial cancer originated from endometrial polyps, and polyp malignancy can be used as a precursor of endometrial cancer.