Among the causes of female infertility, tubal factors account for 1/3, including: tubal obstruction, adhesions, post-episiotomy, tuberculosis, etc.; ovulation disorders account for about 1/3, including: polycystic ovary syndrome, premature ovarian failure, anovulation caused by abnormal adrenal and thyroid functions, etc.; other factors account for 1/3, such as: uterine malformation, submucosal myoma, endometrial tuberculosis, polyps, uterine cavity adhesions, vulvovaginal development abnormalities, scarring, etc.