Hot flashes and night sweats last a median seven and a half years, far longer than most women are told 1. An adequate estrogen dose clears about three-quarters of them within weeks 2.
Started within ten years of menopause, it protects the heart; started twenty years out, it can harm it. Same drug, same dose โ the difference is whether the artery already has plaque. Early starters saw roughly half the coronary deaths and heart attacks 3, and a Danish trial following recently-menopausal women for a decade found about a fifty-percent drop in combined death, heart attack, and heart failure 4.
The breast-cancer risk depends on which hormones. Estrogen plus a synthetic progestin adds roughly one case per thousand women a year 5. Estrogen alone, after a hysterectomy, lowered breast cancer incidence and deaths 6.
It's one of the few drugs that has cut hip fractures in a low-risk population, by about a third while you take it 7.
This is prescription-only, and the decision turns on three things: your timing, your uterus, and your cardiovascular history. Walk in asking which route fits you, rather than whether you qualify.
If your GP hands back the boxed warning, a NAMS-certified menopause practitioner (the list is public) is the more reliable route 10.
Different effects run on different clocks.
- Two to six weeks: hot flashes drop; you sleep through instead of waking drenched.
- Four to twelve weeks: vaginal tissue rehydrates, sex stops hurting, recurrent urinary infections stop 9.
- Three to six months: mood steadies and the fog lifts, mostly because you're sleeping again.
- One to two years: the bone you were losing each year flattens 7. You won't feel it; the scan shows it.
The fine print โ when to skip it, and what people get wrong
Don't start with a personal history of breast or estrogen-sensitive cancer, blood clots, stroke, heart attack, active liver disease, or unexplained bleeding. Ten-plus years past menopause with no symptoms: the window for starting fresh has likely closed 11.
"You must stop at five years." NAMS threw that rule out; duration follows the risk-benefit 1. "Compounded bioidenticals are safer." They lack dose verification and under-deliver progesterone; FDA-approved estradiol is already bioidentical 1.
When it "didn't work": the dose was too low (titrate up), or the route was wrong for your clot risk (patch, not pill) 8. Don't stop cold; abrupt withdrawal flags excess cardiac deaths in the first year 12. Taper.
- 1NAMS (2022). The 2022 Hormone Therapy Position Statement of The North American Menopause Society. Menopause. link
- 2MacLennan AH et al. (2004). Oral oestrogen and combined oestrogen/progestogen therapy versus placebo for hot flushes. Cochrane Database of Systematic Reviews. link
- 3Boardman HM et al. (2015). Hormone therapy for preventing cardiovascular disease in post-menopausal women. Cochrane Database of Systematic Reviews. link
- 4Schierbeck LL et al. (2012). Effect of hormone replacement therapy on cardiovascular events in recently postmenopausal women: randomised trial. BMJ. link
- 5Chlebowski RT et al. (2020). Association of Menopausal Hormone Therapy With Breast Cancer Incidence and Mortality During Long-term Follow-up of the Women's Health Initiative Randomized Clinical Trials. JAMA. link
- 6Anderson GL et al. (2004). Effects of conjugated equine estrogen in postmenopausal women with hysterectomy: the Women's Health Initiative randomized controlled trial. JAMA. link
- 7Cauley JA et al. (2003). Effects of estrogen plus progestin on risk of fracture and bone mineral density: the Women's Health Initiative randomized trial. JAMA. link
- 8Canonico M et al. (2007). Hormone therapy and venous thromboembolism among postmenopausal women: impact of the route of estrogen administration and progestogens (ESTHER study). Circulation. link
- 9NAMS (2020). The 2020 genitourinary syndrome of menopause position statement of The North American Menopause Society. Menopause. link
- 10Manson JE et al. (2024). The Women's Health Initiative Randomized Trials and Clinical Practice: A Review. JAMA. link
- 11Rossouw JE et al. (2007). Postmenopausal hormone therapy and risk of cardiovascular disease by age and years since menopause. JAMA. link
- 12Mikkola TS et al. (2015). Increased cardiovascular mortality risk in women discontinuing postmenopausal hormone therapy. Journal of Clinical Endocrinology & Metabolism. link
Related in the handbook (10)
- โ HRT is aimed squarely at the hot flashes, sleep, and mood swings this transition map lays out.
- โ Beyond hot flashes, estrogen therapy slows the bone loss that leads to the fractures osteoporosis care is racing.
- โ Risk-reducing surgery for BRCA carriers triggers early menopause, making the HRT decision part of the plan rather than an afterthought.
- โ Combined HRT slightly shifts breast-cancer risk, so staying current on mammograms is part of taking it sensibly.
- โ An adjacent topic in the handbook.
- โ Local estrogen treats the genital and urinary symptoms; systemic hormone therapy handles flashes, sleep, and bone.
- โ Menopause and its treatment sit inside the broader picture of women's heart risk.
- โ In perimenopause, contraception and symptom relief overlap โ a hormonal IUD often bridges both before full menopause therapy.
- โ Migraine with aura changes the hormone-safety math โ it's a key question before starting any estrogen.
- โ Lifting and hormone therapy both protect the bone and body composition menopause erodes โ they stack.
Menopausal Hormone Therapy (MHT)
Roughly three in four hot flashes gone within weeks. Night sweats stop, the dryness that made sex hurt reverses, daily life looks like it did before menopause hit.
A daily pill or a patch you change twice a week. The friction isn't the dose โ it's finding a doctor willing to prescribe it.
Night sweats are the thing fracturing sleep in your fifties. Take them away and you sleep like you used to โ measurable within a month.
Generic pills and patches run a few hundred dollars a year; branded products and rings can run higher. Affordable for most with insurance, less so without.
Decades of large trials on the symptom, bone, and breast-cancer findings. The heart and dementia story rests on a smaller, more debated trial base.
The decade after menopause is when skin collagen and vaginal tissue thin fast. Replacing the hormone bends the visible-aging trajectory you'd otherwise be on.
Hip fractures drop sharply while you take it. Started under sixty, it nudges all-cause mortality the right way; in surgical menopause it protects the heart and brain you'd otherwise lose.
Once the night sweats stop waking you and the day stops being a string of hot flashes, the floor your energy was running off comes back up.
The mood swings, the irritability, the perimenopausal slide โ much of it is the hormone drop. Replace it and the inner weather steadies.
The perimenopause "brain fog" clears once sleep is whole again. Real effect, mostly through fixing the sleep that fixes the head.
Skin feels more elastic and intimate tissues plump back up within weeks of vaginal estrogen. A side bonus, not the reason to take it.