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Menstrual Cycle

To understand what happens hormonally during perimenopause and menopause it helps to understand what happens hormonally during the menstrual cycle. Four hormones are primarily responsible for the menstrual cycle: estrogen, progesterone, follicle stimulating hormone (FSH), and luteinizing hormone (LH).

The development of an egg follicle in the ovary is stimulated by FSH. As the egg matures, it secretes estrogen, which stimulates the lining of the uterus (endometrium) to pre...Read the full article