The absence of menstruation in women may be caused by an endocrine disorder, but in the case of women of childbearing age, pregnancy cannot be ruled out as a cause. In the case of perimenopausal women, amenorrhea may also be caused by low ovarian function. Therefore, if you do not have menstruation, you should look for the cause. You can have a hormone test to check the condition of your ovaries, and an ultrasound to check the condition of the uterine adnexa and the endometrium. If there is no contraception, a blood HCG test can also be performed to find out if the absence of menstruation is caused by pregnancy, and the results of the test should be used to treat the symptoms. If it is not caused by pregnancy, it may be caused by endocrine disorder, and effective regulation should be carried out to promote menstruation.