A delay in menstruation of 7 days is within the normal range and the normal menstrual cycle for women is between 28 and 30 days. Sometimes a woman may experience a delay in menstruation for 1-2 days due to mental stress or environmental changes. It may also be caused by the application of special medication that affects the endocrine system of the body and causes a delay in menstruation. When menstruation is delayed for more than 7 days, it is an abnormal delay of menstruation and you should consider the possibility of pregnancy and go to the hospital for a specific examination. Frequent delay of menstruation is a menstrual disease, such as endometritis or disorders of the uterus, which requires prompt medical attention.