子宫内膜异位症的病因和导致不孕的机理尚不明。子宫内膜的种植可由不同的途径引起,最常见为逆行月经。此外,子宫内膜异位症可位于腹腔外,不仅经淋巴、而且经血液良性转移。还有医源性子宫内膜的播散,如剖宫产或子宫切除时。当然还有体腔组织化生学说。除机械的、内分泌学的或发生学的变化,近十年来子宫内膜异位症免疫学调节机理的改变逐渐增加。子宫内膜异位症晚期发展为不孕系因机械性障 The etiology of endometriosis and the mechanism leading to infertility are not known. Endometrial implantation can be caused by different routes, the most common of which is retrograde menstruation. In addition, endometriosis can be located outside the abdominal cavity, not only through the lymphatic, but also benign metastasis of blood. There are iatrogenic endometrial dissemination, such as cesarean section or hysterectomy. Of course, there is body cavity theory of tissue formation. In addition to mechanical, endocrinological or generative changes, endometriosis in the past 10 years to adjust the mechanism of immune regulation increased gradually. Late development of endometriosis infertility due to mechanical barriers