Infertility is the result of many factors, and there are many causes of female infertility, such as: 1. congenital malformations of the female uterus, such as longitudinal uterus, infantile uterus, primordial uterus; 2. poor ovarian function in women, which does not allow them to discharge eggs normally, such as patients with polycystic ovary syndrome or premature ovarian failure; 3. inflammatory diseases, such as endometrial tuberculosis, tubal tuberculosis; 4, The most common cause of secondary infertility is adhesions of the uterine cavity after repeated abortions or curettage. 5. Submucosal fibroids, endometrial polyps, etc., can easily lead to difficulty in pregnancy or early miscarriage after pregnancy.