Estrogen taken as a patch, gel or pill treats the whole body. Estrogen placed in the vagina treats the vagina and bladder. They share a hormone and almost nothing else, and some women need both.
This is what people mean by hormone therapy. The estradiol enters the bloodstream and acts everywhere estrogen acts: on the brain’s thermostat, on sleep and mood, on joints, bone and skin1. It is the most effective treatment for hot flashes and night sweats, and it prevents the bone loss of early menopause1.
Two things follow from the fact that it reaches the whole body.
It reaches the uterus. Estrogen on its own makes the uterine lining grow, so anyone who still has a uterus takes progesterone alongside it to keep the lining in check1.
Ingesting estrogen as a pill means the estrogen passes through the liver before it reaches the rest of you, and the liver responds by making more of the proteins that clot blood. A patch or gel is absorbed through the skin straight into the bloodstream, so it skips the liver. That is why the patch and gel carry less clot risk than the pill, and why they are the usual starting point1.
Why would anyone take the pill, then? Some women can’t tolerate the patch: it irritates their skin or won’t stay on. For a healthy woman under 60 with no clot risk factors the extra risk is small, and she may simply prefer a tablet1. There’s no advantage to the pill beyond that, and for anyone with a family history of clots, migraine with aura, high blood pressure or a smoking history, the patch or gel is the answer1.
If you’ve ever been told hormone therapy causes breast cancer and left it there, read this next. It’s the study that started that fear, what twenty more years of follow-up found, and where the evidence stands now.
Low-dose vaginal estrogen acts on the tissue it touches and barely anywhere else. Blood levels stay in the normal post-menopause range2. It treats vaginal dryness, burning, pain with sex, urinary urgency, and recurrent urinary infections2. It does nothing for hot flashes, sleep, mood, bone, or anything else that low estrogen affects elsewhere in the body.
Since so little reaches the rest of the body, no progesterone is needed2, and it can be an option even after breast cancer, in discussion with the oncologist3.
The dose of systemic therapy that fixes your sleep is not always enough for the vaginal tissue. The Menopause Society’s guidance is plain: if a woman on systemic therapy still has vaginal or bladder symptoms, add low-dose vaginal estrogen2.
So the question is not which one. It is which symptoms. Hot flashes, sleep, mood, bone: systemic. Dryness, sex, bladder: local. Both lists: both.
Since March 1, 2026, both are free with MSP: estradiol patches, gels and tablets, micronized progesterone, and vaginal estrogen (Premarin cream, Imvexxy inserts)4. If your own doctor is not comfortable prescribing either, every certified menopause clinician in BC is listed here.
This article is general information, not medical advice. The medical professional who sees you in person may reach a different assessment, and their judgement takes precedence.