Modern hormone therapy is effective and well tolerated for most women in perimenopause and menopause. Here is what the evidence shows on benefits, risks and timing.
For most women in perimenopause and menopause, modern hormone therapy is effective and well tolerated, and for many the benefits clearly outweigh the risks. That sentence would have been controversial in 2002. It is now where the evidence sits.
For a generation of women, hormone therapy came with a warning label. In the early 2000s, headlines linked it to breast cancer, clots and stroke. Many women stopped. Many more never started.
Since then, researchers have gone back over that evidence more carefully, and the picture is very different. Here is what you need to know.
What hormone therapy is, and why body identical matters
As you move through perimenopause into menopause, your ovaries make less oestrogen and progesterone. Hormone therapy replaces some of what is lost.
It works on the same principle as treating an underactive thyroid. The body is running low on a hormone, so we top it up.
It is mainly used for perimenopause and menopause symptoms. It can also help some women with other hormone related conditions, including premenstrual dysphoric disorder (PMDD).
Body identical hormones have the same structure as the hormones your ovaries make. They are made from plant sources such as soy and yams. Current guidelines recommend them as the first choice.
Body identical is not the same as compounded "bioidentical" hormones mixed to order. Registered body identical products are tested for dose and consistency. Custom compounded creams and lozenges are not, and Australian menopause experts do not recommend them.
That distinction matters more than most people realise. A registered product has a known dose in every patch or capsule. A compounded cream does not, which means neither you nor your doctor can be sure what you are actually absorbing.
What it can do for you
Symptom relief. Hormone therapy is the most effective treatment we have for hot flushes and night sweats. In trials, it cuts hot flush frequency by around three quarters, and the flushes that remain are much milder. Many women also sleep better once night sweats settle. Vaginal dryness and discomfort improve too.
Bone health. Oestrogen protects bone. Hormone therapy can prevent and treat osteoporosis, and it lowers the risk of fractures after menopause.
Heart and brain. Timing matters here. Women who start before 60, or within 10 years of their last period, appear to have a lower risk of heart disease. Starting much later does not bring the same benefit. Research on dementia is still mixed. Hormone therapy is not prescribed purely to prevent heart disease or dementia, but for women who start at the right time, the long term picture is reassuring.
Fewer workarounds. Treating the cause can reduce the need for medicines used to manage symptoms, such as some antidepressants and sleep aids.
The hormones involved
Oestrogen. This does most of the work. It is usually applied to the skin as a gel or patch.
Progesterone. If you still have a uterus, oestrogen on its own can thicken the lining and raise the risk of endometrial cancer. A progestogen protects the lining. This also applies to some women with a history of endometriosis. Options include body identical progesterone taken as a capsule, a hormonal IUD, or a combined patch. Body identical progesterone taken at night can help some women sleep and feel calmer. Progesterone creams are not absorbed reliably and do not protect the lining.
Testosterone. Some women benefit from adding testosterone after a few months. It is most often considered for persistent low sexual desire once oestrogen is settled, and some women also find it helps with fatigue, brain fog and low mood or anxiety. It is applied to the skin.
It is not contraception
Most hormone therapy will not prevent pregnancy, and pregnancy is still possible in perimenopause. If you need contraception, a hormonal IUD is often a good fit. It also protects the lining and can ease the heavy periods common in perimenopause.
Understanding the risks
The 2002 headlines came from a large trial that has since been reanalysed many times. Two things changed the interpretation: the average age of the women in it, and the type of progestogen used.
Breast cancer. Oestrogen on its own, used by women without a uterus, has not been shown to raise breast cancer risk. In the largest trial, risk was actually lower. Most of the extra risk seen in older studies was linked to synthetic progestins. Data on body identical progesterone are reassuring, especially for the first five years, though longer term evidence is still building. Your personal and family history matters, so it should be reviewed carefully as part of any assessment.
Clots and stroke. Oestrogen tablets slightly raise the risk of blood clots. Oestrogen through the skin, at standard doses, has not been shown to do the same. That makes it the preferred route for most women. Women with a higher clot risk can often still use it, but they need individual assessment first.
Here is the practical version of that risk picture:
Risk | Tablet oestrogen | Skin oestrogen (gel or patch) |
|---|---|---|
Blood clots | Slightly raised | No clear increase shown at standard doses |
Stroke | Small increase in older women | Not shown to raise risk |
Breast cancer (with body identical progesterone) | Reassuring for the first five years, longer term data still building | Same |
Endometrial protection | Requires a progestogen if you have a uterus | Requires a progestogen if you have a uterus |
For most women, that table is the whole argument for the skin route.
Side effects, and what to do about them
Early side effects are common and usually settle within a few weeks. They include breast tenderness, bloating, headaches and symptoms similar to PMS. About one in ten women are sensitive to progestogens, and changing the type or route usually helps.
Irregular bleeding or spotting is common in the first six months, and for around three months after a dose change. It often settles by itself. Bleeding that persists, is heavy, or comes with other symptoms needs to be checked.
If side effects are severe, or have not improved after three months, the dose, type or route may need adjusting.
That last point is worth sitting with. Most people who struggle with hormone therapy are not failing it. They are on the wrong dose, the wrong route, or the wrong progestogen, and nobody has gone back to check.
Is it right for you?
The right choice depends on your age, your stage of menopause, your symptoms and your history. There is no fixed time limit. Many women use hormone therapy for years, with a review each year.
A few questions come up so often that they are worth answering plainly.
Does hormone therapy cause breast cancer?
It depends on the type, the duration and the individual. Oestrogen alone in women without a uterus has not been shown to raise risk. Combined therapy carries a small increase, mostly linked to synthetic progestins, and the data on body identical progesterone are reassuring for the first five years. Your personal and family history matters, so it should be reviewed carefully as part of any assessment.
Can I start hormone therapy years after my last period?
You can, and it often still helps symptoms. The cardiovascular benefit is tied to starting within 10 years of your last period or before 60. Starting later does not carry the same heart protection, so the risk and benefit conversation changes.
How long can I stay on it?
There is no fixed limit. The decision is reviewed each year against your symptoms, your risk profile and how you are responding. Some women stop after a few years. Others continue for much longer, and that can be entirely reasonable.
Do I need progesterone if I have had a hysterectomy?
If your uterus has been removed, oestrogen alone is usually enough. If you have a history of endometriosis, that answer can change, and it is worth discussing.
Where this leaves you
Hormone therapy is not a lifestyle choice and it is not a last resort. It is a treatment, with a real evidence base, for a set of symptoms that genuinely affect how women sleep, work and live.
The honest position is this. For most women in perimenopause and menopause, the benefits outweigh the risks. For some, the balance tips the other way, and that is exactly the conversation worth having properly rather than guessing from a headline written two decades ago.
If you are weighing it up, the starting point is a consultation that looks at your symptoms, your history and your priorities together. What hormone therapy can do for you depends on all three, and that is a conversation, not a prescription.
General information, not individual medical advice. Speak to your own doctor.
