The thickness of the endometrium during menopause is usually less than 4mm or less as normal. Generally speaking, women’s endometrium will become thinner after menopause, so a thin endometrium is a normal performance. Normally women will have menstruation because the endometrium gradually thickens with cyclic changes and when it reaches a certain level, menstruation occurs, i.e. the endometrium is shed, so women’s endometrium does not thicken for too long. If it thickens for a long time, for example, some women do not have menstruation for several months and suddenly have one, the amount of menstruation will definitely increase. Therefore, it is a clinical criterion to know whether there is any lesion in the endometrium by detecting the thickness of the endometrium. If abnormal uterine bleeding occurs after menopause, the thickness of the endometrium can be understood by ultrasound. It may not be necessary to panic if the thickness of the endometrium is within the normal range, so it is also essential to know the thickness of the endometrium.