Many patients, do not have a good understanding of how the endometrium grows, develops, and sheds. Here, I would like to compare the endometrium to leeks to explain some of the clinical phenomena associated with the endometrium. 1. The endometrium is divided into a functional layer and a basal layer The endometrium is divided into a functional layer and a basal layer, and the leek is divided into a leaf on the soil and a rhizome under the soil. The leaves of leeks are equivalent to the functional layer of the endometrium and the rhizomes are equivalent to the basal layer of the endometrium. 2, how menstruation comes Each menstrual cycle, the functional layer of the endometrium is shed to form menstruation, while the basal layer remains in place, just as the leek matures, the top leaves are cut off, and its rhizome is not pulled out. 3, the role of estrogen and progesterone on the endometrium Estrogen is equivalent to nutrients, promoting the growth of the endometrium, and progesterone has two roles, one is to make the endometrium change in the secretory phase, and the other is to make the endometrium shed when progesterone retreats. Estrogen to the endometrium is like nutrients to leeks, and nutrients can promote the growth of leeks; progesterone to the endometrium is like sunlight and a scythe to leeks. When progesterone persists, it is like sunlight, which promotes the ripening of leeks, while when progesterone withdraws, it is like a scythe, which cuts off all the leaves of leeks in a neat and tidy way. 4. Endometrium acting on estrogen alone Estrogen alone, without the action of progesterone, will lead to unrestricted growth of the endometrium, followed by breakthrough bleeding and drenching, and even lead to malignant changes in the endometrium. Just like leeks that only have nutrients but no sunlight or sickle, they will only keep growing, and when they reach a certain level, they will start to sparsely break down, and while this side is breaking down, that side will start to break down, and before that side is done, this side will start to grow again, just like that, breaking down little by little and bleeding little by little. 5. Progestin-only endometrium Progestin alone, without sufficient estrogen action, the endometrium cannot grow and keeps changing in a secretory phase. Just like leeks with only sunlight and no nutrients, it can’t grow. 6, endometrial damage There are many causes of endometrial damage, the most common is abortion and scraping, if the damage to the basal layer of the endometrium, so that the damaged part of the endometrium can not grow, there is a low menstruation, or even amenorrhea, as if the leek was uprooted, to grow leeks again, it is naturally impossible.