The uterus is a hollow organ, and in terms of anatomical position on the surface of the body, the side of the uterus next to the bladder is called the anterior wall of the uterus; the side of the uterine wall next to the rectum is called the posterior wall of the uterus. The histology of both the anterior and posterior uterine walls is the same, with the mucous membrane, myometrium, and plasma layer of the uterus. After pregnancy, often the fertilized egg will be deposited in the uterus, may be deposited in the anterior wall, may be deposited in the posterior wall, there is no great difference, are normal phenomenon. It is recommended to have a gynecological examination once a year, mainly to find out whether there are abnormal fibroids in the uterus, whether there is abnormal enlargement, and whether there is abnormal thickening of the endometrium.