Delayed menstruation after intercourse without pregnancy, for this case, may be the patient’s recent stress or often stay up late and so on, may cause menstruation delay occurs. If the patient has hyperprolactinemia or polycystic ovary syndrome, in this case, there will also be a delay in menstruation. If the patient has recently lost too much weight, it can also cause irregular menstruation and delayed menstruation. Delayed menstruation and absence of menstruation can also occur if the patient experiences a decline in ovarian function, such as premature ovarian failure. In addition, if the patient has adhesions in the cervix after an abortion or a previous uterine operation, etc., the patient may also experience delayed menstruation and absence of menstruation.