The causes of delayed menstruation for half a month are the following: first, it may be female pregnancy, for women of childbearing age if they have sex and delayed menstruation for more than a week, consider the possibility of pregnancy, it is recommended to use early pregnancy test paper to see if you are pregnant. Second, may be caused by endocrine disorders, if the pituitary gland secretion gonadotropin low or ovarian secretion sex hormone low, will affect the normal endometrial proliferation and shedding bleeding, may lead to delayed menstruation half a month, common in pituitary atrophy, pituitary tumors, premature ovarian failure and other diseases. Third, there are other reasons that may cause delayed menstruation for half a month, such as environmental changes, stress, irregular life, etc. It is recommended that if you are not pregnant, you can take progesterone and other drugs to promote menstruation, you need to follow the doctor’s advice. If your period is delayed for more than three consecutive months, you need to have a blood test for sex hormone six between the second and fifth day of menstruation, combined with the results of pituitary CT examination and pelvic ultrasound to further determine what the cause is, and then consider the next step of treatment.