There are several causes of follicular dysplasia: the first one is pituitary problems, one of the causes of follicular dysplasia, common diseases that lead to ovulation abnormalities, including pituitary prolactinoma, hyperprolactinemia, and Silhan syndrome, where high prolactin levels can inhibit ovulation. The second, a hypothalamic anovulation, is a primary organic factor, primary functional factor, secondary organic lesion, and secondary functional factor, all of which can lead to hypothalamic anovulation. The third one is premature ovarian failure. In some women, follicular dysplasia is caused by premature ovarian failure. Patients have normal early menstruation and even a history of fertility, but then they develop scanty menstruation and even gradual amenorrhea. In these patients, the follicles in the ovaries are depleted and it is not possible to develop them with ovulatory drugs, or they may have primordial follicles but they do not respond to gonadotropins. The fourth is polycystic ovary syndrome, which is one of the causes of ovulatory dysplasia. The fifth, like excessive obesity, mental stress, or other health factors, can also lead to endocrine disorders in women, which can affect the development of follicles.