Endometrial thickening 19mm can be best treated by choosing a treatment depending on the cause. The main causes of endometrial thickening 19mm include hormonal imbalance, endometrial polyps, endometrial cancer or ectopic pregnancy. Hormonal imbalance refers to the hormonal imbalance in the body caused by the living environment, diet or medication, which will easily lead to the thickening of the uterine lining. This situation can be treated with oral medication, such as dydrogesterone tablets, etc., and if the effect of the medication is not obvious, the uterus should be scraped. Endometrial polyp is a foreign body that grows in the endometrium, it can lead to the thickening of the endometrium and cause irregular bleeding, the main treatment is hysteroscopic surgery to remove it. Endometrial cancer is an epithelial malignant tumor that occurs in the endometrium, which is also prone to endometrial thickening, and should be further examined to see if it can be treated surgically. Ectopic pregnancy is a pregnancy in which the fertilized egg does not enter the uterus to develop, and then the lining will also continue to thicken. In this case, blood tests for HCG and ultrasound are needed to determine this, and if ectopic pregnancy is determined, hospitalization is required. Continuous thickening of the lining requires prompt medical attention to find out the cause of the disease and treat the symptoms to avoid delaying the disease.