It is possible to get pregnant with a thin endometrium, but it depends on the degree of thinness, and it is possible to get pregnant with a little thinness within the normal range. If it is significantly lower than the normal thickness, there is no way for the fertilized egg to be implanted and no pregnancy will occur. It is necessary to understand the cause of thin endometrium through laboratory tests or ultrasound examination combined with past medical history to understand whether the thin endometrium is caused by adhesions in the uterine cavity, to treat it with medicine or to separate the adhesions under hysteroscopy, and then to treat it with medicine to make the endometrium thicken and restore it to the normal range before getting pregnant. When thin endometrium is found, the cause should be found and treated according to the cause.