The first reason is endocrine disorder, this situation is the recent work pressure, insomnia, anxiety will lead to endocrine disorder, you can take oral progesterone to promote menstruation. Second, polycystic ovary syndrome caused by the pelvic long tumor can also lead to menstruation, it is recommended that the B ultrasound can be examined, through the laboratory test comprehensive analysis, the clinical then give the corresponding treatment. The third is caused by the decline of ovarian function, the cause of premature ovarian failure is still unclear, but with often stay up late, excessive smoking and drinking have a direct relationship. If a woman has premature ovarian failure, the corresponding clinical symptoms will appear and oral medication can be given to intervene.