Most women hear that menopause means estrogen drops. That is part of it. But three hormones shift during this transition, and a fourth one, FSH, is the signal your brain sends as it all happens.
And because they change on different timelines, your symptoms can look different from month to month.
Estrogen (estradiol)
Estrogen supports your brain, bones, heart and blood vessels, skin, vaginal tissue, and mood (Monteleone et al., 2018).
In perimenopause it doesn't fall smoothly. It spikes and crashes. Those swings drive hot flashes, night sweats, headaches, and mood changes, and eventually it settles low after menopause.
Progesterone
Progesterone balances estrogen, stabilizes the uterine lining, and has a calming effect that supports sleep.
It is usually the first hormone to decline, because it is made after ovulation and ovulation becomes irregular. That is why sleep and PMS often change first. Read more in estrogen dominance in perimenopause.
Testosterone
Yes, women make it too, in the ovaries and adrenal glands. It supports desire, energy, and muscle.
But unlike estrogen, it doesn't drop off a cliff at menopause. It declines gradually with age, starting years earlier (Davis et al., 2019).
FSH (follicle-stimulating hormone)
FSH is a signal from your brain telling the ovaries to work. As the ovaries respond less, the brain turns up the volume and FSH rises. A rising FSH is one of the earliest chemical signs of the transition (Harlow et al., 2012).
But FSH swings too, which is why it can't confirm or rule out perimenopause on its own. Read can a blood test tell if you're in perimenopause?
Why the out-of-sync pattern matters
- Symptoms change month to month A high-estrogen month can look nothing like a low one.
- One lab can mislead A single draw captures one moment in a moving system.
- Treatment is individual Two women the same age can need very different plans.
That is exactly how we approach women's hormone care: your symptoms, your cycle pattern, and your labs read together.
Want to know what your hormones are doing?
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Frequently asked questions
Which hormone drops first in perimenopause?
Progesterone usually falls first, because it is made after ovulation and ovulation becomes irregular in perimenopause.
Does estrogen go up or down in perimenopause?
Both. Estrogen swings, sometimes higher than in your younger years, before it declines after menopause.
Do women have testosterone?
Yes. Women make testosterone in the ovaries and adrenal glands. It declines gradually with age rather than dropping suddenly at menopause.
What does FSH mean in perimenopause?
FSH rises as the ovaries respond less to the brain's signal. It is an early sign of the transition, but it fluctuates too much to diagnose perimenopause on its own.
Sources
- Monteleone P, Mascagni G, Giannini A, Genazzani AR, Simoncini T. Symptoms of menopause: global prevalence, physiology and implications. Nature Reviews Endocrinology. 2018.
- Harlow SD, Gass M, Hall JE, et al. Executive summary of the Stages of Reproductive Aging Workshop + 10. Journal of Clinical Endocrinology & Metabolism. 2012.
- Davis SR, Baber R, Panay N, et al. Global consensus position statement on the use of testosterone therapy for women. Journal of Clinical Endocrinology & Metabolism. 2019.
- Patton E, Shaughnessy M, Roberson Jasper N, et al. VA/DoD Clinical Practice Guideline for Menopause. Department of Veterans Affairs. 2026.
This article is general health information, not medical advice, and does not create a patient relationship. Don't start or stop any medication or supplement without talking to your provider. If you are having a medical emergency, call 911.