What is the thickness of the endometrium before menstruation?

The endometrium begins to grow on the first day after the menstrual period ends and begins to shed on the first day of the menstrual period, repeating the cycle over and over again. The quality of the endometrium directly affects fertility. Endometrium that is too thin or too thick will affect fertility. Therefore, it is particularly important to understand the thickness of the endometrium at different stages. Next, let me introduce to you what the thickness of the endometrium is like before menstruation.

The endometrium is the layer that makes up the lining of the mammalian uterus. It responds to both estrogen and progesterone and can therefore vary significantly with the sexual cycle. The thickness of the endometrium is different at different times. The following is an introduction to the thickness of the endometrium before menstruation:

1. Proliferative stage:

Around day 5-9 of the menstrual cycle, the endometrium is very thin. In the early stages of proliferation, the endometrium appears as a thin echo line, about 4-6 mm thick. In the middle stage of hyperplasia, the endometrium gradually shows three strong echo lines, and the low echo area in between is two layers of functional endometrium with a thickness of about 8-10mm. In the late stage of hyperplasia, the thickness of the endometrium increases to about 9-10 mm.

2. Secretory phase:

On the 15th to 19th day of menstruation, which is 1 to 5 days after ovulation, the endometrium continues to thicken and the glands further increase in size and curvature. Around the 20th to 24th day of the menstrual cycle, which is 6 to 10 days after ovulation, the endometrium shows a high degree of secretory activity, and the curvature and expansion of the glands reach their peak. During the late secretory phase, the normal thickness of the endometrium before menstruation is about 5-6mm.

3. Menstrual period:

Days 1-4 of the menstrual cycle. At this time, the levels of estrogen and progesterone decrease, activating the synthesis of prostaglandins in the endometrium. Prostaglandins can stimulate the contraction of the uterine muscle layer and cause continuous spasm of the spiral arterioles in the functional layer of the endometrium, resulting in a decrease in endometrial blood flow. The area of ​​damaged, ischemic, and necrotic tissue gradually expands. Tissue degeneration and necrosis, increased permeability of the blood vessel wall, and rupture of the blood vessels lead to the formation of hematoma at the bottom of the intima, which promotes tissue necrosis and exfoliation. The degenerated and necrotic endometrium mixes with blood and is discharged to form menstrual blood. The normal thickness of the endometrium can reach 8-10mm.

The thickness of the endometrium before menstruation is very important, as is the thickness of the endometrium after menstruation. Because the thickness of a woman's endometrium is not a specific number, women do not need to worry when testing their endometrial thickness as long as the time is corresponding.

In short, whether the endometrium is healthy is really important to our female friends. Through the above introduction, I believe everyone has a certain understanding of the thickness of the endometrium before menstruation. In this way, when you do an ultrasound examination, you will know whether there is any problem with your endometrium. If there is a problem, you can consult a doctor in time.