Drenching menstruation with an abnormal endometrial lining of 11mm is considered to be a thick endometrial lining. The endometrium sheds periodically to form menstruation. When the lining of the uterus reaches 10mm, it is time for menstruation. If the menstruation has already started and is always heavy (not completely cleared), and the endometrium is still 11mm thick, then the endometrium is considered to be thickened. At this time, we should consider endometrial lesions, endometrial cancer, endometrial polyps and other effects. Specific need to do relevant hysteroscopy to confirm the diagnosis, according to the results of the examination, if necessary, need to carry out scraping. Endometrial polyps may need to be removed surgically. Keep the pubic area dry and hygienic, and change underwear frequently.