Women’s menstrual cycle is always delayed, the reasons are as follows: First, if the delay in less than a week is in a normal situation, may be due to mental psychology, stress, emotional fluctuations in the impact of change; Second, there may be women’s bodies have hormone secretion disorders, that is, menstrual dysfunction, for example, low levels of hormones secreted by the ovarian hypoplasia, which will make the endometrial growth of the uterine lining is thin, resulting in the emergence of a Third, when a woman has a combination of medical diseases, such as hypothyroidism or hyperthyroidism; fourth, if a woman is pregnant, she will also experience menopause, which is mistaken for menstrual delay. When a woman’s menstrual cycle is delayed, she needs to go to the hospital in time to do gynecological ultrasound, sex hormones, HCG and other tests, and according to different reasons to take appropriate medication.