The delay of menstruation for half a month without pregnancy is considered to be related to endocrine disorders, unstable ovarian function, taking drugs and other factors. It is recommended to do relevant examinations in time to clarify the diagnosis and give appropriate treatment. 1. Endocrine disorders: generally due to disease or life factors, if a woman often stay up late, mental stress, excessive alcohol and tobacco may lead to endocrine disorders. After endocrine disorders occur, the level of estrogen and progesterone in the body changes, which can lead to menstrual cycle disorders and delayed menstruation. 2. Unstable ovarian function: Usually too much stress, emotional excitement, etc. may cause unstable ovarian function, irregular menstruation, premature ovarian failure symptoms appear. 3. Taking medication: If your period is delayed for half a month, it may be caused by taking medication. If you have used hormonal drugs, such as progesterone or emergency contraceptive pills, before ovulation or menstruation, your hormone levels will be altered. As the hormone level in the body is altered, it may also lead to delayed menstruation. In addition, you need to adjust your mindset on a daily basis, maintain a good routine and get enough sleep. Diet should be light and nutritious, do not eat stimulating food, etc..