The endometrium is made up of a portion of the uterine lining and usually varies in thickness in a cyclical fashion and is not fixed. If a patient has an endometrial lining of 8 mm, this may or may not be normal for a normal non-menopausal woman. However, for menopausal women, it usually indicates the possibility of abnormal symptoms.1. Non-menopausal women: If a woman is in the first half of the menstrual cycle, that is, the follicular phase, the endometrial lining of 8mm is normal, because at this time the endometrium is often around 8-10mm for the fertilization of the egg. If she is in the late luteal phase, the endometrium may be thin at 8mm. However, if a woman is at the end of her menstrual period, an endometrial lining of 8mm is abnormal, as the normal endometrial lining is often between 3-5mm. This condition may be caused by incomplete shedding of the endometrium, and if diagnosed, hormone supplementation is often required for treatment. In addition, if the endometrium is still 8mm when a woman is about to have her period, it often indicates a delay in menstruation, generally at least 10mm endometrium before menstruation will come; 2. Postmenopausal women: 8mm endometrium means thickened endometrium, because the endometrium is bounded by 5mm after menopause. If ultrasound suggests endometrial 8mm, consider endometrial thickening, common as endometrial polyps, further hysteroscopy plus scraping is needed to confirm the diagnosis.