Usually, a woman’s period is delayed for a maximum of 7 days. If it exceeds 7 days, examination is required to determine the exact cause. A woman’s normal menstrual cycle is 21-35 days, with slight fluctuations of 3 – 5 days earlier or later in some people, but up to a maximum of 7 days. If menstruation is delayed for more than 7 days, women of childbearing age who are sexually active need to consider pregnancy, and it is recommended to use early pregnancy tests or blood tests to make a clear diagnosis. Some women taking drugs containing hormones, such as progesterone and emergency contraceptive pills, can also lead to menstrual disorders and delayed menstruation. In addition, ovarian dysfunction, polycystic ovary syndrome, nervousness, anxiety, stress and environmental changes can also lead to delayed menstruation. Therefore, women should not delay menstruation for more than 7 days. For women who often experience delayed menstruation, they should go to the hospital to clarify the cause of delayed menstruation and undergo targeted treatment.