Endometrial hyperplasia is not cancer; the normal endometrial lining is in a proliferative state. Endometrial hyperplasia occurs due to a lack of secretion of progesterone. If it continues to develop, it can progress to atypical endometrial hyperplasia, which is a precancerous condition of the endometrium. If not treated in time, it could develop into endometrial cancer. Thus, active treatment of endometrial hyperplasia is necessary. Large doses of progesterone can be used to promote the transformation of the endometrial lining. Once the endometrium transforms into the secretory phase, it indicates that the endometrial hyperplasia has been effectively treated and can prevent the progression to endometrial cancer.