The causes of immature follicles are: 1) poor egg quality due to smoking, alcohol consumption, irregular lifestyle, staying up late, etc. 2) pelvic inflammatory disease and ovarian inflammation, which prevent the follicles from developing normally. 3) hormonal disorders, such as low follicle growth hormone, can also cause immature follicles. 4) polycystic ovary syndrome, pituitary tumors, lactinomas, etc. 5. Immature follicles can also be caused by hyperthyroidism or altered adrenal cortical function. Therefore, when a woman has immature follicles, she should adjust her lifestyle and go to the hospital for gynecological ultrasound and sex hormone tests. If it is due to inflammation, you need to actively treat the inflammation, and if it is due to hormonal disorders, you need to actively adjust the hormone levels and treat the primary disease in order to recover from the condition.