Aunt refers to menstruation. Delayed menstruation may be due to normal menstrual cycle fluctuation, pregnancy and other physiological conditions, or it may be due to premature ovarian failure, polycystic ovary syndrome and other pathologic conditions, which can be intervened by paying attention to warmth, improving lifestyle habits, fertility preservation treatment, medication and other methods. 1. Menstrual cycle fluctuations: the normal menstrual cycle is 21-35 days, normal menstruation will also have small fluctuations, if the menstrual delay within 7 days is normal. 2. Pregnancy: when the human body is pregnant, the most obvious manifestation is the delay of menstruation, at this time should be carried out early pregnancy test, such as pregnancy test paper, blood HCG (human chorionic gonadotropin) determination, uterine adnexa ultrasound, and so on. 3. Premature Ovarian Failure: If there is ovarian failure, menstruation may be delayed, and estrogenic drugs can be used to regulate, such as estradiol, estriol, ethinyl estradiol, ethyl estradiol, progesterone and so on. 4. Polycystic ovary syndrome: this disease will affect ovulation leading to delayed menstruation, can use ethinyl estradiol cyproterone, drospirenone ethinyl estradiol tablets and other drugs to adjust the menstrual cycle. If there is a delay in menstruation for more than 7 days, it is recommended to go to the hospital in a timely manner, under the guidance of the doctor to take the appropriate methods of treatment, such as the need for medication, it is recommended to use under the guidance of the doctor to avoid unauthorized use of medication, so as to avoid adverse consequences.