How thick is the lining of the vagina on the 18th day of menstruation?

We all know that menstruation is caused by the shedding of the endometrium, but many girls don’t know much about the endometrium and can only learn about it from books. In fact, the female endometrium has many uses. It not only protects the uterus, but also plays an important role in the implantation of the fetus. If a girl's menstruation is irregular, it may be caused by a disease of the endometrium. So, how thick is the endometrium generally on the 18th day after menstruation?

1. What is the endometrium

It refers to a layer of tissue in the uterine wall that responds to changes in estrogen and female hormones, so it changes regularly and cyclically with the menstrual cycle and estrus cycle.

Follicle-stimulating hormone causes the uterus to grow uniformly; female hormones cause the endometrium to undergo special early pregnancy changes, or to undergo changes in its properties, giving it the ability to produce decidua. There is a layer of mucous membrane on the endometrium, which is composed of two parts: the mucosal epithelium located above and the lamina propria located below. When follicle hormone is secreted, the epithelial cells will grow larger and divide, increasing the number of cells. After entering the functional layer in the lamina propria, they will form uterine glands and produce different responses with changes in follicle hormone. The basal layer underneath is full of blood vessels and does not respond to follicle-stimulating hormone.

2. How thick is the endometrium?

Generally speaking, the normal thickness is one to ten millimeters, but it will proliferate and fall off with changes in hormone levels, so its thickness changes accordingly with different periods of time. Generally speaking, the endometrium begins to proliferate after the end of menstruation, reaches its maximum value one day before menstruation, and then the functional layer and tissue blood flow out together. This process is called menstruation.

During the menstrual period, the thickness varies with the period. Doctors recommend that women go to the hospital for a vaginal B-ultrasound examination three days after the end of their menstrual period. The results can help them understand the thickness of the endometrium and whether there are any abnormalities. Generally speaking, a thickness of more than eight millimeters is abnormal. If it is too thick, it will easily cause dysmenorrhea and hinder the smooth implantation of the fertilized egg; if it is too thin, it will reduce the menstrual volume and even affect normal ovulation. When the examination results show abnormal thickness, appropriate treatment should be carried out immediately to avoid affecting fertility.