Menstruation and each person’s environmental stress, mental factors, including changes in endocrine hormones, may produce some changes, delayed 7-10 days is a normal phenomenon, menstruation delayed half a month has not come, this time there is menstrual irregularities. The first thing to rule out is that there is no chance of pregnancy, because there is no measure of sexual intercourse that month, this time may cause pregnancy, and will cause the menstrual period for a long time not to come. In ruling out the case of no pregnancy, consider the endocrine hormone disorders may be greater, the same oral some drugs, such as emergency contraceptive pills, this time may cause menstruation delayed for a long time. Because it has been delayed for half a month, as far as possible to go to the hospital registered ultrasound gynecological ultrasound according to the situation need to look at the thickness of the uterine lining to decide whether to take oral menstrual stimulation to stimulate menstruation to achieve the restoration of the normal uterus, including the situation of menstruation. If a long time delay, as far as possible, also need to check the endocrine hormone six, to rule out any endocrine hormone disease, according to the situation can be oral short-acting contraceptive drugs, Yusmin, Yusiyue for cycle regulation for 3 months.