The endometrium is 13 millimeters, although not menstruating, but will not be menopausal. Because the endometrium is thicker, it may be approaching menstruation, or it may be endocrine disorders, and pregnancy cannot be excluded, so the patient is advised to consult a doctor in time to find out the cause of the disease. The endometrium will undergo proliferation and shedding in response to cyclical changes in ovarian hormone levels, so the thickness of the endometrium varies throughout the menstrual cycle. The endometrium is usually thickest before menstruation and may reach about 12 millimeters. Now the ultrasound examination of the endometrium 13 mm, although there is no menstruation, but it does not mean that it is menopausal, because this endometrium is thicker, it may be soon to menstruation, it may be endocrine disorders, and it can not be excluded from the possibility of pregnancy. If it is endocrine disorders caused by not menstruating, you can take progesterone or dextroprogesterone and other drugs under the guidance of the doctor, to promote the shedding of the uterine lining, so that menstruation. If there is a history of sexual intercourse, the endometrium is 13 mm and menstruation does not come, it is recommended to go to the hospital for blood HCG test, except the possibility of pregnancy. If a woman is menopausal, the ovarian function declines, and the level of estrogen in the body decreases, the endometrium will no longer proliferate, so the endometrium will be thinner, usually no more than 5 mm.