Estrogen in HRT

Estrogen is the hormone whose decline during perimenopause and menopause drives most of the classic symptoms — hot flashes, night sweats, and vaginal dryness among them. Replacing it is the core of hormone therapy (HRT), and it's graded Strong evidence by The Menopause Society as the most effective treatment for vasomotor symptoms and genitourinary syndrome of menopause, while also preventing bone loss.

Estrogen alone, or estrogen with a progestogen?

This is determined by one simple factor: whether you still have a uterus.

• Estrogen-only HRT is offered to people who've had a total hysterectomy. With no uterine lining left, there's nothing for unopposed estrogen to overstimulate.
• Combined HRT (estrogen plus a progestogen) is offered to people who still have a uterus, because estrogen alone can thicken the uterine lining over time, raising endometrial cancer risk — the progestogen protects against that. See our progesterone and progestogens page for more.

This isn't a preference call — it's a safety requirement based on your anatomy.

Forms and dose

Estrogen is available as pills, patches, gels, sprays, and (in low-dose vaginal form) creams, tablets, and rings for local symptoms only — see our dedicated vaginal estrogen page for that distinct use case. For systemic use, NICE recommends using the lowest effective dose, and the route you choose changes more than convenience — see HRT patch vs. pill for how it affects blood clot and stroke risk specifically.

Where this fits in the bigger picture

Estrogen's benefits and risks — breast cancer, blood clots, stroke — vary by type, route, and your personal history. See types of HRT for how the pieces fit together, who HRT may suit, and who needs specialist advice before narrowing down a specific approach, and our Does It Work? evidence directory if you want to compare it against non-hormonal options.

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