There are three types of hyperplastic endometrium: the first is simple hyperplasia, the second is complex hyperplasia, and the third is atypical hyperplasia. The first one is a normal change in the endometrium before ovulation and is not pathological, while the latter two are pathological. Studies have shown that complex hyperplasia, due to prolonged estrogen overstimulation without progesterone antagonism, is related. Such an endometrium without regular withdrawal bleeding from progesterone is hyperplastic and a pathological examination can reveal complex hyperplasia of the endometrium. If the complex hyperplasia is not effectively treated, there is further risk of atypical hyperplasia, or precancerous lesions, and the cancer rate increases. Once a woman has irregular vaginal bleeding and the thickness of the endometrium increases, or the thickness of the endometrium exceeds the diagnostic criteria after menopause, she needs to undergo timely diagnostic scraping and the changes of the endometrium.