It is not normal for women not to have menstruation at the age of 40. Normally, menopause occurs in women at the age of 45-55, and menstrual disorders, delayed menstruation and amenorrhea will occur. If a woman does not get her period at the age of 40, if she has sex without contraception, she may be pregnant and needs to undergo an early pregnancy test. After ruling out pregnancy, it may be caused by endocrine disorder, as well as excessive life stress, frequent late nights, excessive mental tension, and frequent use of birth control pills, etc., which can cause delayed menstruation. If you have pelvic inflammatory disease, endometritis, etc., it is easy to cause pelvic adhesions, which will lead to the absence of menstruation. If you have abnormal ovarian function, it will also affect the onset of menstruation, so you can go to the hospital for hormone six examination, and at the same time, we suggest vaginal discharge examination, abdominal ultrasound examination, etc. The most reasonable treatment according to the specific situation, you can take progesterone to promote menstruation.