VEGFA and endometrial polyp: This study mainly investigated the clinical effect of post hysteroscopic progesterone hormone therapy in the treatment of endometrial polyps, deeply studied whether the combined therapy could effectively control the recurrence of endometrial polyp, identify the changes of the serum level of Vascular Endothelial Growth Factor (VEGF) before and after treatment, and explored the possible mechanism of the formation of endometrial polyp, which provides a reliable and effective evidence for the clinical treatment of endometrial polyps.