There are many possible reasons for not having a period for more than a month. Common causes include menopausal amenorrhea, pregnancy, the effects of medications, puberty, stress, and polycystic ovary syndrome or hyperprolactinemia. Different measures should be taken for different situations. I. Non-disease factors 1. Pregnancy status: If you are a woman of childbearing age and have a recent history of sexual intercourse, there is a possibility of pregnancy. Early pregnancy test paper can be applied to check, if there are signs of pregnancy, you should go to the hospital for a comprehensive examination; 2. Menopause: as women age, after the age of 40 the ovarian function will gradually decline, the ovarian secretion of hormone levels fluctuate, there will be menstrual scarcity, usually without treatment. If you have insomnia or irritability, you can apply paroxetine and mirtazapine under the guidance of a professional physician to control insomnia and bad mood; 3, puberty: the hypothalamus-pituitary-ovarian axis is not well developed during puberty, which can lead to the absence of menstruation for more than a month; 4, drug effects: such as oral contraceptives or progesterone, which can lead to a large increase in progesterone in women and inhibit ovulation This can cause the ovaries to secrete less estrogen and delay menstruation. Generally after a few months of discontinuation, menstruation may automatically return to normal. If you observe 2-3 months or not, you should go to the hospital for examination to exclude the possibility of pregnancy and gynecological lesions; 5, stress: whether it is mental stress, or work pressure, may lead to menstrual cycle disorders, the phenomenon of delayed menstruation. At this time, you need to find a way to reduce stress, such as running, swimming, playing games, travel, etc. After relieving the pressure in your heart, your menstruation will gradually return to normal. 2, disease factors 1, polycystic ovary syndrome: high androgens and suppression of ovarian function, clinical treatment is usually given estrogen and progestin drugs, such as ethinyl estradiol, dydrogesterone, etc.; 2, hyperprolactinemia: due to abnormal pituitary function, resulting in abnormally high serum prolactin levels, suppressing ovarian function, resulting in delayed menstruation, overflow of milk, loss of libido and other symptoms, can be applied methanesulfonic acid Bromocriptine, α-dihydroergotocriptine and other drugs can be used for treatment to inhibit prolactin secretion; 3, other diseases: in addition to these factors mentioned above, they can also be caused by hypothyroidism, pituitary tumors, severe anemia, uterine surgery and other diseases.