The delay of menstruation for half a month in a 38-year-old woman may be related to pregnancy, endocrine disorders, diseases and other factors. 1. Pregnancy: If a woman is pregnant as a result of recent sexual activity, her period may be delayed for half a month. It is recommended to consult a doctor for a pregnancy test in time, or you can use pregnancy test paper to conduct an early pregnancy test. 2. Endocrine disorders: when a woman’s long-term mental stress, tension, changes in the work environment may lead to endocrine disorders, which can cause delayed menstrual cycles 3. Diseases: When the patient has uterus and ovary lesions, such as polycystic ovary syndrome, uterine fibroids, etc., it may affect the secretion pattern of estrogen and progesterone, which may cause menstruation to be delayed for half a month. In addition, taking progesterone drugs, excessive weight loss, bad habits and other factors may also cause delayed menstruation, it is recommended that timely medical examination, follow the doctor’s instructions to clarify the cause of the targeted treatment.