The primary hormones that decrease during menopause are estrogen and progesterone, both produced by the ovaries. Estradiol, the most potent form of estrogen, drops from a premenopausal range of 10 to 300 pg/mL to less than 10 pg/mL after menopause. A third hormone, anti-Müllerian hormone (AMH), also declines to undetectable levels during the transition. Testosterone decreases too, though that drop is tied to aging rather than menopause itself.
Why Hormone Production Drops
Your ovaries contain a finite supply of follicles, the tiny structures that release eggs each month and produce hormones. You’re born with about one to two million of them, and by the time you reach menopause, roughly 1,000 remain. At the end of the menopausal transition, the follicle supply is completely exhausted. Without functioning follicles, the ovaries can no longer produce meaningful amounts of estrogen or progesterone, and ovulation stops permanently.
This process doesn’t happen overnight. During perimenopause, which can last anywhere from four to ten years, hormone levels fluctuate unpredictably. Estrogen can spike higher than normal one month and plummet the next. Cleveland Clinic describes it as a hormonal rollercoaster. Eventually, estrogen production drops so low that the ovaries stop releasing eggs entirely, and you reach menopause, defined as 12 consecutive months without a period.
Estrogen: The Biggest Shift
Estrogen is the hormone responsible for the widest range of menopausal symptoms. It acts on receptor sites throughout the body, not just in the reproductive system. When those receptors lose their estrogen supply, changes cascade across multiple systems.
The most recognizable effects are hot flashes and night sweats, which affect up to 80% of women during the transition. But estrogen decline also causes vaginal dryness as the tissue thins without hormonal stimulation, changes in sex drive, anxiety, insomnia, and mood shifts. Bone health takes a significant hit as well. Women lose up to 10% of their bone density in the first five years after menopause. Early thinning is called osteopenia; as it progresses, it becomes osteoporosis, which substantially raises fracture risk.
After menopause, your body doesn’t stop making estrogen entirely. The adrenal glands and ovaries continue producing androgens (a group of hormones that includes testosterone), and fat tissue converts those androgens into a weaker form of estrogen called estrone. This peripheral production is modest compared to what the ovaries once supplied, but it does provide a baseline level. Women with more body fat tend to have slightly higher postmenopausal estrogen levels because of this conversion process.
Progesterone: The First to Go
Progesterone is actually the first hormone to decline noticeably, often years before estrogen drops significantly. The ovaries produce progesterone after ovulation each month. As cycles become irregular in perimenopause and ovulation happens less reliably, progesterone levels fall. This is why many perimenopausal symptoms appear before estrogen levels change dramatically.
Low progesterone causes irregular and sometimes heavier periods, trouble sleeping, headaches, bloating, mood changes including increased anxiety or depression, and hot flashes. Because progesterone normally counterbalances estrogen’s effects on the uterine lining, the early drop in progesterone while estrogen remains relatively high can cause particularly heavy or unpredictable bleeding during perimenopause.
Anti-Müllerian Hormone
AMH is a hormone produced by the small, developing follicles in your ovaries. Its level reflects how many follicles you have left, making it one of the best biological markers for where you stand in the transition toward menopause. AMH steadily decreases with age and becomes undetectable during the menopausal transition.
Research published in the Journal of Clinical Endocrinology and Metabolism found that AMH was a stronger predictor of time to menopause than other hormone tests. Women in their late reproductive years with very low AMH levels (below 0.20 ng/mL) reached menopause in a median of about six years. Women with higher levels (above 1.50 ng/mL) had a median of about 13 years before menopause. Once AMH becomes undetectable, menopause typically follows within about six years. The timing varies considerably from person to person, but AMH gives a more reliable estimate than other markers.
Testosterone: An Age-Related Decline
Women produce small amounts of testosterone throughout their lives, and levels do decrease at midlife. Median testosterone concentrations drop measurably between ages 40 and 59, reaching their lowest point around age 58 to 59 before slightly increasing again. However, this decline tracks with aging, not with the menopausal transition itself. Studies comparing women at different menopausal stages found no meaningful difference in testosterone levels between pre- and postmenopausal women of the same age.
That distinction matters, but the practical effects are still real. The low point in testosterone around the late fifties corresponds with the peak prevalence of low sexual desire and arousal. Women with testosterone levels in the lowest quarter also tend to have less favorable cholesterol profiles, greater loss of grip strength, and more depressive symptoms. Testosterone therapy has been shown to improve sexual desire in postmenopausal women experiencing distress from low libido, though research hasn’t confirmed benefits for bone density, muscle preservation, or mood.
How Hormone Changes Are Measured
If you’re wondering whether you’ve reached menopause, the most commonly used blood test measures follicle-stimulating hormone (FSH). FSH is produced by the pituitary gland in your brain, and it actually increases during menopause rather than decreasing. Here’s why: when the ovaries stop responding, the brain keeps sending stronger signals to try to stimulate egg production, driving FSH levels up. A level above 30 mIU/mL, combined with 12 months without a period, is generally considered diagnostic.
During perimenopause, FSH can fluctuate just like estrogen, so a single test may not give a clear answer. Repeat testing over several months helps establish whether levels are consistently rising. Women with elevated but not yet postmenopausal FSH levels can still become pregnant, which is worth keeping in mind.
The Timeline of Hormonal Changes
The hormonal shifts of menopause don’t follow a neat sequence, but there’s a general pattern. Progesterone begins declining first as ovulation becomes less consistent, often in a woman’s early to mid-forties. AMH, reflecting the shrinking follicle pool, drops steadily throughout the late thirties and forties. Estrogen fluctuates wildly during perimenopause before falling to its permanently low postmenopausal level. Testosterone decreases gradually with age throughout this entire window.
The average age of menopause is 51, but the transition can begin a decade earlier and the range of normal is broad. The severity of symptoms varies just as widely. Some women experience minimal disruption; others deal with significant effects on sleep, mood, bone health, and quality of life for years. Understanding which hormones are involved, and when they change, helps make sense of symptoms that can otherwise feel unpredictable.