If you usually have very regular periods and your period is delayed for 25 days to check that you are not pregnant, you have to consider that it is an episodic menstrual disorder. It may be related to the recent work and study stress, or the change of work and study environment, weather changes, excessive dieting, weight loss and other factors. You can find the cause according to your own situation, and you need to do gynecological ultrasound to observe the endometrium. If the thickness of the endometrium can reach 1.0cm, you can use motherwort and Shaogangxu Pellet to activate blood circulation and eliminate blood stasis to promote menstruation. If the endometrial lining is relatively thin, estrogen can be added to the treatment according to the situation, or progestin alone can be used to promote menstruation. After menstruation, observation can be continued as long as the next menstruation can return to normal. If menstruation is delayed for 25 consecutive days on two or more consecutive occasions, it is considered a menstrual disorder and requires systematic examination and treatment.