What is the normal thickness of the endometrium before menstruation?

Jul 10, 2025 Source: Cainiu Health

Dr. Zhang Lu

Introduction

Before menstruation, the endometrium is in the secretory phase under the influence of estrogen and progesterone, with a thickness of 8-16mm considered within the normal range. This is because during the second half of the menstrual cycle, progesterone secreted by the ovaries causes further thickening of the endometrium and increased vascularity, preparing for the potential implantation of a fertilized egg.

Generally, the normal thickness of the endometrium before menstruation is 8-16 mm. Detailed analysis is as follows:

Prior to menstruation, under the influence of estrogen and progesterone, the endometrium is in the secretory phase, and a thickness of 8-16 mm falls within the normal range. This is because during the second half of the menstrual cycle, progesterone secreted by the ovaries further thickens the endometrium and promotes vascular proliferation, preparing for possible implantation of a fertilized egg. An endometrial thickness of 8-16 mm provides sufficient nutrients and environmental conditions necessary for implantation of the fertilized egg, and also reflects the normal proliferative state of the endometrium under hormonal regulation. As hormone levels decline before menstruation begins, the thickened endometrium naturally sheds. This range of thickness ensures normal menstrual bleeding volume and cycle regularity, representing a physiological adaptation to reproductive needs.

The thickness of the endometrium continuously changes throughout the menstrual cycle. It is recommended to undergo regular gynecological ultrasound examinations to monitor endometrial thickness. If any abnormalities occur, timely medical consultation is advised.

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