The endometrium is the lining of the uterus. Every month, this lining builds and thickens in preparation for a potential pregnancy, providing the ideal environment for the implantation of a fertilized egg. If pregnancy does not occur, the endometrium is shed during the woman's monthly period. The term proliferative endometrium refers to the state of the endometrial layer while it grows.
A proliferative endometrium is a normal part of healthy uterine function when it occurs during the first half of the menstrual cycle. The endometrium becomes thicker leading up to ovulation to provide a suitable environment for a fertilized egg to grow inside the uterus. A proliferative endometrium in itself is not worrisome. However, sometimes problems can develop during the proliferative phase of endometrial growth.
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