Endometrial thickening can be physiologic or pathologic, physiologic does not require treatment, and pathologic requires surgery or medication to thin the endometrium. 1. Physiological: During a woman’s menstrual cycle, the endometrial lining thickens before the onset of menstruation, and may reach 10~17mm, as long as it clears within seven days after menstruation, this situation is normal, and the endometrial lining’s thickness is the thinnest after menstruation cleansing, so it generally does not need to be treated. 2. Pathologic: (1) Endometrial polyps: hysteroscopic surgery is needed to weed out and remove polyps. (2) Endometrial hyperplasia: it can be treated with progesterone drugs. (3) Endometrial cancer: If the patient does not have fertility requirements, the uterus needs to be removed, and if the patient has fertility requirements, the patient needs to use high-dose progesterone to regulate the treatment, etc. Progesterone drugs, such as progesterone capsules, dydrogesterone tablets, etc. are also used. Therefore, want to endometrial thinning need to go to the hospital for a clear diagnosis, by the doctor according to the specific conditions, to develop individualized diagnosis and treatment plan, so as not to delay the condition.