If the patient’s menstruation has been very regular before the imaging, and there is a delay in menstruation after the imaging, the following possibilities should be considered: First, if the delay in menstruation is within one week of the original cycle, it is a normal fluctuation of the menstrual cycle, which may be related to the patient’s mental tension or contrast stimulation during the imaging, the patient can continue to wait for the onset of menstruation. Secondly, if the patient’s menstruation is delayed for more than one week and there is intercourse, the possibility of pregnancy must be ruled out, and blood and urine HCG can be checked to make a judgment. Third, after ruling out pregnancy, the delayed menstruation for one week should be considered as a possible episodic menstrual disorder. Patients can check the ultrasound to observe the thickness of the endometrium and wait for the onset of menstruation, or they can choose to use progesterone, shao abdomen with stasis granules or motherwort to promote the onset of menstruation according to the situation.