Endometrial thinning is a very common gynecological disease, formed for a number of reasons, mainly the following: 1, endocrine disorders: the body is controlled by endocrine, when the endocrine disorder will produce a series of diseases. The endometrium is regulated by estrogen and progesterone. When the secretion of estrogen and progesterone decreases, the endometrium has no more power to grow and will become thinner. Similarly when these two hormones increase, the endometrium will thicken. 2, abortion: some women choose abortion to abort an unwanted pregnancy, too many abortions, or in small clinics doctor action too heavy and other reasons can lead to thinning of the endometrium. There are also girls who choose medical abortion, which is also extremely harmful, although there is no knife, the composition of drugs in medical abortion is a lot of harmful ingredients, this composition will not distinguish the child or the mother, a general damage, even more than the surgical abortion damage. Even some patients have never had a period after the abortion procedure. This situation means that the abortion has seriously harmed the endometrium of the human body, causing the disease of thin endometrium. 3, uterine development malformation: the normal uterus is inverted pear-shaped, but some people are slender strips, because this is congenital, in the body that this is normal, so it is difficult to treat. In ordinary times, we should pay attention to the protection of their own, encounter the situation to go to a regular and reliable hospital diagnosis.