The following gynecological diseases can cause delayed menstruation: First, because of endocrine disorders, anxiety, emotional changes, environmental changes, or excessive work stress may lead to endocrine disorders and delayed menstruation in clinical practice. Secondly, polycystic ovary syndrome may prolong the menstrual cycle and reduce the menstrual volume, or even cause amenorrhea. Thirdly, premature ovarian failure may lead to delayed menstruation and progressive amenorrhea. Fourthly, pelvic tumor can cause delayed menstruation. Therefore, once menstruation is delayed, it is recommended to find out the cause before giving treatment.