The endometrium is invisible to the naked eye during a vaginal examination and can only be seen during an ultrasound examination. For example, the ultrasound examination can reveal the thickness of the endometrium, whether the endometrial echogenicity is uniform, and whether there are abnormal echogenicity in the endometrium, all of which can be understood very clearly through ultrasound. Therefore, the endometrium cannot be seen with the naked eye unless the uterus is removed and the uterus is cut open to see the endometrium. In clinical practice, if you want to know the condition of the endometrium, most of the time it is given by ultrasound. In addition, if the endometrium is found to be abnormal by ultrasound, a diagnostic scraping is done clinically and the scraped endometrium is sent for pathology, which is then visible to the naked eye. If the scraped endometrium looks like bean curd, it may be caused by endometrial cancer.