The normal thickness of the endometrium is between 2-10mm. The thickness of the endometrium varies in different periods, from 0.5-3.5mm in the value-added phase and thickens in the secretory phase, which can reach 10mm. It is best to have regular ultrasound examinations to see the condition of the endometrium. If the endometrium becomes thin, it may be caused by frequent abortions or by lack of estrogen in the body. Endometrial thickening is considered to be caused by endometrial hyperplasia, which may be caused by endocrine disorders, polycystic ovaries or functional ovarian tumors. It is best to choose the right treatment according to the condition of the endometrium. If the endometrium is thin, it can be regulated with estrogenic medication such as Tegretol, and if the endometrium is too thick, the uterus needs to be scraped and pathological examination is performed to rule out the possibility of malignancy.