Endometrial hyperplasia - does it grow suddenly? what kind of treatments are needed?

Endometrial dx: Endometrial hyperplasia is not "sudden," it is a progressive thickening of the lining of the uterus due to estrogen effect. Early phases are called "simple hyperplasia." this can progress if untreated to "complex hyperplasia" or "atypical hyperplasia" - if left untreated, it can progress to endometrial carcinoma. Treatment is progesterone hormones to counteract the estrogen.