Last checked September 2026 against 29 sources · Editorial policy
Estrogen vs progesterone: what each hormone does
Estrogen and progesterone are the two main female sex hormones, and they work as a pair. Estrogen builds the uterine lining in the first half of the cycle, peaks before ovulation and supports bones, skin, brain and vaginal health. Progesterone rises after ovulation, prepares the lining for pregnancy and keeps estrogen's growth in check. In HRT, women with a uterus take both: estrogen for symptoms, progesterone to protect the lining.
Estrogen builds the uterine lining and drives the first half of the cycle; progesterone stabilizes it after ovulation. How the balance shifts in perimenopause.
Estrogen and progesterone: expectation vs reality
What people often expect
“Estrogen and progesterone fall together at menopause”
What the evidence shows
They usually don't. Progesterone depends on ovulation, which becomes irregular first, so it often drops years before estrogen. In one study, estradiol in ovulatory cycles rose with each stage of reproductive aging while luteal progesterone fell. Average estradiol only started falling about 2 years before the final period in SWAN.
Estrogen vs progesterone: what each hormone does
The difference between estrogen and progesterone
Estrogen is a group of hormones, estrone, estradiol and estriol, made mainly by the ovaries, plus body fat and the adrenal glands. It drives puberty, the first half of the cycle and fertility. Progesterone is a single hormone made mainly by the corpus luteum after ovulation, and by the placenta in pregnancy. Its main job is preparing the uterus for a fertilized egg.
Estrogen and progesterone in the menstrual cycle
In the first half of the cycle, estrogen makes the uterine lining grow thicker and rises fast 2 to 3 days before ovulation, triggering the LH surge. After ovulation, progesterone rises to ready the lining for implantation, while estrogen rises again more modestly. If you don't get pregnant, both fall and the lining sheds as your period. A typical cycle is 28 days, with 24 to 38 still regular.
Learn more →Estrogen and progesterone balance
The two hormones balance each other in the uterus: estrogen builds the lining, progesterone stops it from getting too thick. When there's too little progesterone for the amount of estrogen, the lining can overgrow into endometrial hyperplasia; some providers call this estrogen dominance. It's why estrogen HRT alone raises uterine cancer risk in women with a uterus.
Learn more →Estrogen and progesterone levels in perimenopause
As ovulation becomes irregular, some cycles make no progesterone at all, while estrogen can swing high. A study of daily urine found perimenopausal women had higher estrone and lower progesterone after ovulation than younger women. Later, estradiol falls too, and after menopause Labcorp's ranges are 6.0 to 54.7 pg/mL for estradiol and 0.0 to 0.1 ng/mL for progesterone.
Estrogen effects on females beyond the uterus
Estrogen affects far more than reproduction: bone density, cholesterol and blood sugar, blood flow, skin collagen and moisture, muscle mass and focus. Progesterone's effects are narrower but include calming, sleep-promoting effects and, per Cleveland Clinic, roles in mood and thyroid function. Low estrogen causes hot flashes, dryness and bone loss; low progesterone is linked to irregular periods, mood changes and poor sleep.
Testosterone, estrogen and progesterone
Women's ovaries make testosterone too, which plays an important part in sexual desire. Unlike estrogen and progesterone, it doesn't drop suddenly at natural menopause: the NHS says the ovaries keep producing it for up to 20 years afterwards. Removing both ovaries removes all three at once, which is why surgical menopause can feel abrupt.
Learn more →Taking estrogen and progesterone as HRT
If you have a uterus, HRT combines estrogen with a progestogen. While you still have periods, progesterone is taken for part of each month, bringing a bleed; after a year without periods, both are usually taken every day. If you've had a hysterectomy, estrogen alone is used. The progestogen can be a pill, part of a combined patch or tablet, or a hormonal IUD.
Learn more →Side effects of estrogen and progesterone
Estrogen side effects can include headaches, breast tenderness, unexpected bleeding or spotting, nausea, mood changes, leg cramps, mild rash, diarrhea and hair loss. Progestogen side effects overlap: spotting, headaches, breast tenderness, nausea, tiredness or dizziness, mood changes, rash and acne. Most go away within a few weeks; if they don’t, a different dose or type often helps.
Learn more →Estrogen and progesterone levels by the numbers
From the studies on this page
before the final period is when average estradiol starts to fall, in SWAN
2 years
Bar scaled to a 12-year reference span
85.8–498 pg/mL
1.8–23.9 ng/mL
24–38 days
Estrogen is measured in pg/mL and progesterone in ng/mL, so the numbers can't be compared directly.
Taking estrogen and progesterone together
Combined HRT if you have a uterus
First stepEstrogen treats hot flashes, dryness and bone loss; progesterone protects the lining. Taking estrogen alone could cause uterine cancer.
Related guide →Estrogen alone after hysterectomy
First stepWithout a uterus, there's no lining to protect, so estrogen-only HRT is usually used.
Match the schedule to your stage
Strong evidenceSequential (cyclical) HRT while you still have periods; continuous combined once you've had no period for a year.
Related guide →Choose the progestogen that suits you
Strong evidenceMicronized progesterone, other progestins or a hormonal IUD all work; switching can fix side effects.
Related guide →
When to see a doctor about estrogen and progesterone balance
Heavy, frequent or irregular periods in your 40s
See a doctor. Estrogen without enough progesterone can thicken the lining.
More →Hot flashes, dryness or sleep problems affecting daily life
Ask about HRT; you don't need to wait for periods to stop.
Taking estrogen without a progestogen when you have a uterus
See your doctor to add one.
Bleeding after menopause
See a doctor; it always needs checking.
More →
Estrogen vs progesterone: questions women ask
What is the difference between estrogen and progesterone?
Estrogen builds the uterine lining and supports bones, skin, brain and vaginal tissue. Progesterone, made after ovulation, prepares the lining for pregnancy and keeps estrogen's growth in check.
Is progesterone the same as estrogen?
No. They're different hormones with different jobs, though both are made by the ovaries and both change through the menstrual cycle.
What is the opposite of estrogen?
No hormone is its exact opposite, but progesterone counterbalances estrogen in the uterus: estrogen builds the lining and progesterone stops it overgrowing.
What does estrogen and progesterone balance mean?
Having enough progesterone to balance estrogen's effect on the lining. Without it, the lining can overgrow; this imbalance is sometimes called estrogen dominance.
Related →Why do you take estrogen and progesterone together?
If you have a uterus, estrogen alone makes the lining thicken and raises the risk of uterine cancer. Progesterone stops the lining from getting too thick.
What happens to estrogen and progesterone in perimenopause?
Progesterone often falls first because ovulation becomes irregular, while estrogen can swing high before it falls in the last couple of years before menopause.
Can you have high estrogen and low progesterone?
Yes, and it’s common in perimenopause. Cycles that don’t ovulate make no progesterone, while estrogen can still run high. Heavy or irregular periods and sore breasts are typical signs.
Related →What are estrogen and progesterone levels during the cycle?
At Labcorp, estradiol ranges from 12.5 to 166 pg/mL before ovulation, 85.8 to 498 at ovulation and 43.8 to 211 afterwards. Progesterone is 0.1 to 0.9 ng/mL before ovulation and 1.8 to 23.9 afterwards.
Related →What are the side effects of estrogen and progesterone?
Common ones are breast tenderness, headaches, nausea, bloating, spotting and mood changes. Progesterone can also cause drowsiness. Most side effects settle within a few weeks.
Related →Is estrogen the same as oestrogen?
Yes. Oestrogen is the British spelling and estrogen the American one for the same hormones.
Do I need both estrogen and progesterone in HRT?
If you have a uterus, yes: estrogen treats the symptoms, and a progestogen stops the lining from thickening, which estrogen alone would do. If you've had a hysterectomy, estrogen alone is usually used. The progestogen can be a pill, part of a combined product or a hormonal IUD.
Which hormone drops first in perimenopause, estrogen or progesterone?
Usually progesterone, because it depends on ovulation, which becomes irregular first. Estrogen can stay normal or even run higher for years; in SWAN, average estradiol only began to fall about 2 years before the last period.
Sources
- MedlinePlus, US National Library of Medicine. Progesterone test.
- Cleveland Clinic. Estrogen: hormone, function, levels and imbalances.
- Cleveland Clinic. Progesterone: natural function, levels and side effects.
- NHS. Utrogestan (micronised progesterone): about.
- Hale GE, Zhao X, Hughes CL, et al. Endocrine features of menstrual cycles in middle and late reproductive age and the menopausal transition classified according to the Staging of Reproductive Aging Workshop (STRAW) staging system. J Clin Endocrinol Metab. 2007;92(8):3060-7.
- Randolph JF Jr, Zheng H, Sowers MR, et al. Change in follicle-stimulating hormone and estradiol across the menopausal transition: effect of age at the final menstrual period. J Clin Endocrinol Metab. 2011;96(3):746-54.
- MedlinePlus, US National Library of Medicine. Estrogen levels test.
- Labcorp. Estradiol (test 004515): reference range and clinical information.
- Office on Women’s Health, US Department of Health and Human Services. Your menstrual cycle.
- Cleveland Clinic. High estrogen: causes, symptoms, dominance and treatment.
- Santoro N, Brown JR, Adel T, et al. Characterization of reproductive hormonal dynamics in the perimenopause. J Clin Endocrinol Metab. 1996;81(4):1495-501.
- Labcorp. Progesterone (test 004317): reference range.
- Caufriez A, Leproult R, L'Hermite-Balériaux M, et al. Progesterone prevents sleep disturbances and modulates GH, TSH, and melatonin secretion in postmenopausal women. J Clin Endocrinol Metab. 2011;96(4):E614-23.
- Cleveland Clinic. Low estrogen: causes, symptoms, diagnosis and treatment.
- NHS. Hysterectomy: considerations.
- NHS. Types of hormone replacement therapy (HRT).
- NHS. Utrogestan (micronised progesterone): common questions.
- US Food and Drug Administration. Hormone replacement therapies can help women with bothersome menopausal symptoms.
- NHS. Side effects of hormone replacement therapy (HRT).
- NHS. Utrogestan (micronised progesterone): side effects.
- NHS. Utrogestan (micronised progesterone): how and when to take.
- NICE. Menopause: identification and management (NG23). Updated 2024.
- British Menopause Society. Tool for clinicians: HRT preparations and equivalent alternatives. 2024.
- NICE. Heavy menstrual bleeding: assessment and management (NG88).
- NHS. When to take hormone replacement therapy (HRT).
- NHS. Postmenopausal bleeding.
- Prescribing information: Prometrium (progesterone capsules). Acertis Pharmaceuticals, 2026. DailyMed, US National Library of Medicine.
- NHS. Oestrogen tablets, patches, gel and spray: about.
- Cleveland Clinic. Estrone: function, hormone levels and testing.
See our editorial policy.
Related guides
Estrogen
Estrogen runs the cycle and affects brain, bone, skin and heart. Its three types, how levels change in perimen…
Progesterone
Progesterone prepares the uterine lining, supports pregnancy and may aid sleep. It often falls first in perime…
Estrogen during the menstrual cycle
Estrogen peaks just before ovulation, dips, rises again after it, then drops before your period. Ranges by pha…
High estrogen and estrogen dominance symptoms
Heavy periods, sore breasts, bloating and mood swings can mean high estrogen relative to progesterone, common …