If menstruation is often delayed, it is often related to the following factors: first, due to endocrine disorders, for example, in clinical practice, prolonged anxiety, mood changes, and exposure to cold stimuli, will lead to delayed menstruation. The second is due to certain diseases, such as polycystic ovary syndrome, which often causes amenorrhea, weight gain, and hirsutism. In addition, if menstruation is delayed, such as regular delay, the menstrual cycle has been 40 days, this situation is also a normal phenomenon, because every woman has her own menstrual cycle, as long as the color of the menstruation, the amount of menstruation, the time of menstruation, as well as the menstrual cycle, there is no change of the phenomenon, it is a normal phenomenon. For patients with irregular menstrual delay, it is recommended to go to the hospital for a sex hormone six test and ultrasound examination.