The Investigation · Volume 07
Hormone replacement therapy — benefits and risks, plainly
Two decades of confusing headlines have left a generation of women unsure whether HRT is safe. The current evidence is actually clear — for most women under 60 starting within 10 years of menopause, the benefits outweigh the risks. Here is what that actually means.
What HRT is
Hormone replacement therapy replaces the hormones the ovaries stop producing in perimenopause and menopause — primarily estrogen, and progesterone for anyone with a uterus (to protect the lining). Modern regimens use body-identical estradiol delivered through a patch, gel, or spray, paired with micronised progesterone taken orally at night.
Benefits
- Eliminates or substantially reduces hot flushes and night sweats
- Improves sleep quality, often within weeks
- Eases mood swings, anxiety, and brain fog for many women
- Treats genitourinary symptoms (vaginal dryness, recurrent UTIs)
- Reduces long-term risk of osteoporosis and fragility fractures
- May reduce cardiovascular risk when started within 10 years of menopause
Risks to know
- Small increase in breast cancer risk with combined HRT after ~5 years
- Oral (not transdermal) estrogen slightly raises clot and stroke risk
- Higher baseline risk if you start over age 60 or 10+ years post-menopause
- Personal/family history of breast cancer, clots, or stroke needs review
- Transient side effects: bloating, breast tenderness, breakthrough bleeding
Estrogen therapy vs combined HRT
Estrogen-only therapy is for women who have had a hysterectomy. It carries the lowest breast-cancer signal of any HRT regimen. Combined HRT (estrogen + progesterone) is the standard for anyone with a uterus, because unopposed estrogen thickens the uterine lining and raises endometrial cancer risk. The progesterone protects the lining; that is its job.
Transdermal estrogen (patch, gel, spray) bypasses the liver and does not raise clot risk in most studies — which is why it is now the default starting route in current UK and US guidelines.
Who HRT is usually right for
Women in perimenopause or within 10 years of their last period, under age 60, with symptoms affecting quality of life — and without a personal history of hormone- sensitive cancer, recent clot, or untreated cardiovascular disease. Most healthy women in this window are candidates; the conversation is about dose and delivery, not whether.
Who should pause for a longer conversation
Personal history of breast or endometrial cancer, untreated high blood pressure, active liver disease, recent stroke or heart attack, or a previous venous thromboembolism — these don't automatically rule HRT out, but they shift the risk-benefit calculation and need a specialist menopause clinician, not a five-minute GP visit.
Monitoring HRT once you start
The first 3 months are an adjustment window. Tracking symptoms day-by-day is the single fastest way to know whether your dose is right — flushes should fade first, sleep next, mood and brain fog last. If nothing has moved by week 8, that is information. Read the companion guide on what to log in the first 90 days.
Build the case
HRT works best when you can see what changed.
Track symptoms, side effects, and bleed days — Desperate Healthwives turns it into a one-page summary your prescriber can read in under a minute.
Educational content only — not medical advice. HRT decisions should be made with a clinician who knows your full history.