Aunt here refers to menstruation, what is the reason that menstruation is always delayed has many aspects, such as endocrine disorders, pituitary microadenomas, ovarian lesions, endometrial lesions, other factors. 1. Endocrine disorders: women with high stress, mental tension or irregular life will have irregular menstrual cycles, such as delayed or early menstrual cycles, low menstrual flow and other symptoms. 2. Pituitary microadenomas: when suffering from pituitary microadenomas, women may have low menstrual flow, prolonged menstrual cycle or amenorrhea. 3. Ovarian lesions: when women have polycystic ovary syndrome, they will have obesity, hyperandrogenism, hirsutism, infertility, anovulation, etc., and will also have prolonged menstrual cycle and decreased menstrual flow. 4. Endometrial lesions: Most of the women have a history of abortion, scraping and other operations, due to excessive damage to the uterine lining, which can also cause delayed menstrual cycles and decreased menstrual flow. 5. Other: Women with other diseases need to take certain drugs can also cause delayed menstrual cycle, such as antipsychotics, some contraceptives, and so on. Women need to pay attention to menstrual hygiene, and if they always have delayed menstrual cycles, they need to go to the hospital and be examined by a professional doctor to get a clear diagnosis and treatment for the cause of the disease.