Endometrium 1.0cm if in the endometrium secretion period is generally normal, in the proliferation period, menstrual period, menopause is not normal. Normal human endometrium will undergo cyclic changes, in the proliferative period is generally 3 ~ 5mm, the secretory period is the thickest generally about 10mm, menstrual period Fei thin, so when the endometrium is in the secretory period, 1.0cm thick may be normal. In other periods 1.0cm of endometrium is not normal and is considered endometrial thickening. Thickening of the endometrium may be related to endometrial diseases such as endometrial hyperplasia, endometritis, etc., or ovarian dysfunction. When a woman’s uterine lining is abnormally thickened, she needs to clarify the cause and actively treat it under the guidance of her doctor.