There are two kinds of cases in which menstruation is delayed every month, one of which belongs to the normal menstrual cycle, and the other is delayed menstruation due to pathological factors, such as endocrine disorders, medications, diseases, and so on. 1. Normal menstrual cycle: If menstruation is delayed for 7 days or less every month, which is relatively regular, it is a normal menstrual cycle. If menstruation is delayed once in a while or delayed for about 7 days, and the duration and amount of menstruation are within the normal range, it is also a normal menstrual cycle change and does not need treatment. 2. Pathological factors: Delayed menstruation caused by pathological factors may be caused by polycystic ovary syndrome due to ovarian endocrine dysfunction, hyperprolactinemia or thyroid dysfunction, etc., which requires active medical treatment, ultrasound and hormone 6 and other related tests to make a clear diagnosis as soon as possible. There may be other reasons for delayed menstruation every month, so it is recommended to consult a doctor in time to rule out abnormalities, and follow the doctor’s instructions to standardize treatment if necessary.