Is an endometrial thickness of 7mm in the uterine cavity a sign that menstruation is about to start?

The thickness of the endometrium in the uterine cavity changes during physiological cycles. So, does an endometrial thickness of 7mm mean that menstruation is about to start?

Does an Endometrial Thickness of 7mm Indicate Upcoming Menstruation?

It is perfectly normal for menstruation to occur with an endometrial thickness of 7 millimeters. The timing of menstruation is not entirely determined by endometrial thickness but is instead regulated by estrogen and progesterone levels in the body. Menstruation—the periodic shedding of the endometrium—is controlled by estrogen secreted by the ovaries, follicle-stimulating hormone (FSH), and luteinizing hormone (LH) secreted by the pituitary gland. When luteinizing hormone surges, progesterone levels rapidly decline, and this withdrawal of progesterone triggers menstrual bleeding. Therefore, when the endometrium ranges from 7 to 15 mm in thickness, a drop in progesterone may lead to the onset of menstruation. If menstrual flow is light despite a 7mm-thick endometrium, hysteroscopy may be performed to check for intrauterine adhesions or endometrial damage.

Early medical treatment is recommended for thickened endometrium. Under a doctor's guidance, natural progesterone can be used to regulate the condition. Progesterone acts like a pharmacological curettage—after medication, the endometrium typically gradually sheds and thins. Menstrual changes should be closely monitored. Repeated endometrial proliferation may lead to menstrual disorders, heavy menstrual bleeding, difficulty in complete shedding, and significant impacts on health.

During menstruation, maintain good personal hygiene and avoid raw or cold foods. I hope this answer has been helpful to you. Wishing you good health and happiness!