There are multiple reasons for immature eggs, mainly these factors: a. Pituitary problems. One of the causes of poor ovarian development and common diseases that lead to abnormal ovulation, including pituitary prolactinoma, hyperprolactinemia, and high prolactin levels can inhibit ovulation. Second, hypothalamic anovulation. Primary organic factors, primary functional factors, secondary organic lesions, secondary functional factors. Third, premature ovarian failure. Poor follicular development in some women is due to premature ovarian failure. Fourth, polycystic ovary syndrome. One of the causes of poor follicular development is polycystic ovary syndrome, which is the most common cause of female non-ovulation. The ovaries are characterized by increased ovarian volume, with multiple small follicles but failing to develop to maturity. Therefore, the causes of immature eggs are many, and you need to go to the hospital to find out the cause and then target the right treatment according to the specific situation.