what is endometrial hyperplasia is the same as thickening
Quick Answer. Endometrial hyperplasia is an abnormal thickening of the lining of the uterus, according to the American Congress of Obstetricians and Gynecologists. The condition usually develops during menopause and perimenopause when ovulation is irregular or absent. It can also occur in women affected by polycystic ovary syndrome or obesity.