An endometrial thickness of 20mm before menstruation is not normal.
Under normal circumstances, the thickness of the endometrium of a mature woman will not exceed 13 millimeters. If there is endometrial thickness of 20 millimeters, it is usually caused by diseases such as simple hyperplasia of the endometrium, polyp of the endometrium, complex hyperplasia of the endometrium, and cancer of the endometrium.
Endometrial thickness of 20 mm is commonly seen during puberty, menopause functional uterine bleeding, etc., due to unstable secretion of hormone levels in the body. Due to luteal insufficiency, the endometrium is continuously stimulated by estrogen without progesterone to counteract it, so there will be prolonged hyperplasia and menstrual disorders.
In addition, the endometrium is 20 millimeters thick, which may lead to prolonged irregular vaginal bleeding. It is recommended to do diagnostic curettage as prescribed by the doctor, and then do pathological examination for clear diagnosis to exclude the possibility of endometrial cancer.
If this kind of situation occurs, you need to go to the hospital in time, improve the relevant examination, make a clear diagnosis under the guidance of professional doctors, and target treatment.