Why does the endometrium thicken?

Endometrial thickening is mainly due to estrogen stimulation, thus causing endometrial growth and development. Endometrium is in the process of continuous dynamic changes. After menstruation, the endometrium reaches its thinnest, generally about one millimeter. As it enters the proliferative period and secretory period, the endometrium will gradually thicken. This situation is a normal physiological phenomenon. Generally, when it reaches about 14 mm, it means that menstruation is coming soon. If the thickness of the endometrium exceeds 14 mm, this situation does not rule out the possibility of endometrial hyperplasia. Mainly due to endocrine disorders caused by this situation is mainly considered for simple hyperplasia, only a very small number of malignant change of the possibility, can consider diagnostic curettage, and do pathological tests to carry out, whether there are malignant lesions.