Is endometrial thickness of 1.8㎝ serious, depending on how old it is. If the endometrium is 1.8㎝ in young age, although it is thicker than the normal 1.3-1.8㎝, most of the young ones have simple endometrial hyperplasia or complex endometrial hyperplasia under the effect of estrogen. If you are 40-50 years old and the thickness of endometrium reaches 1.8㎝, it is necessary to do diagnostic scraping to see if the endometrium is combined with endometrial cancer. If there is endometrial cancer, surgery must be actively taken as the best method. If there is no problem with the diagnostic scraping of the endometrium, you can take medicine to regulate the condition.