There are many reasons why women do not ovulate: 1. When endocrine hormone disorders exist, the ratio between ovulatory hormone and luteinizing hormone exceeds the normal range by 2-3, suggesting the presence of ovarian hypofunction. For example, when the presence of anti-Mullerian hormone has fallen below the normal range, it is also indicative of ovarian hypofunction. For example, in the presence of prolactinemia or polycystic ovary syndrome, the absence of mature follicles may cause irregular menstruation, which may lead to anovulation or even the absence of mature follicles. 3. This may even lead to anovulation and the absence of mature follicles. In this case, the cycle can be restored to a normal cycle through manual cycle management and then treated with ovulation-promoting medication to restore normal ovulation.