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What causes the lining of your uterus to thicken?

By Zaira Salvador B.Sc., M.Sc. (embryologist).
Last Update: 04/12/2018

Estrogen is the hormone that causes the lining of the uterus to thicken and prepare the uterus for pregnancy. If pregnancy does not occur, estrogen and progesterone levels decrease, causing the endometrial lining to shed in the form of menstrual flow.

 Zaira Salvador
Zaira Salvador
B.Sc., M.Sc.
Embryologist
Bachelor's Degree in Biotechnology from the Technical University of Valencia (UPV). Biotechnology Degree from the National University of Ireland en Galway (NUIG) and embryologist specializing in Assisted Reproduction, with a Master's Degree in Biotechnology of Human Reproduction from the University of Valencia (UV) and the Valencian Infertility Institute (IVI)
License: 3185-CV
Embryologist. Bachelor's Degree in Biotechnology from the Technical University of Valencia (UPV). Biotechnology Degree from the National University of Ireland en Galway (NUIG) and embryologist specializing in Assisted Reproduction, with a Master's Degree in Biotechnology of Human Reproduction from the University of Valencia (UV) and the Valencian Infertility Institute (IVI) License: 3185-CV.