Ovarian suppression in premenopausal women: who needs it?

Ovarian suppression means stopping the ovaries from making oestrogen, usually with monthly or three-monthly injections such as goserelin. For premenopausal women with hormone-sensitive breast cancer, it is added to tamoxifen or an aromatase inhibitor when the cancer carries a higher risk of returning. Studies found the extra benefit is greatest in younger women and those whose cancer was high enough risk to need chemotherapy. For lower-risk cancers, tamoxifen alone is often enough.

Why switching off the ovaries helps

Before menopause, the ovaries are the main source of oestrogen. Lowering that oestrogen starves hormone-sensitive cancer cells, and it also allows an aromatase inhibitor to be used, which would not work while the ovaries are active.

What it feels like

Suppression brings on menopause-like symptoms: hot flushes, vaginal dryness, lower libido, mood changes and joint aches. These are often stronger than with tamoxifen alone, but they usually ease once the injections stop.

Who may not need it

Women with small, lower-risk cancers who did not need chemotherapy, women already near natural menopause, and those for whom the added side effects would outweigh a small benefit. The decision is individual.

For younger women with higher-risk hormone-sensitive cancers, adding ovarian suppression lowers the chance of recurrence in a meaningful way. For lower-risk cancers the gain is much smaller, while the symptoms are the same. That is why this is a careful, individual decision.

Symptoms can be hard

Sudden menopause in your thirties or forties can affect sleep, mood, sex, work and relationships. Many women stop treatment early because of this. Telling your team early about symptoms gives the best chance of managing them and staying on treatment.

Bones need protection

Low oestrogen thins bones, especially with an aromatase inhibitor. Bone density scans, exercise, calcium and vitamin D, and sometimes bone medicines, help protect against fractures later.

It is usually reversible

When the injections stop, the ovaries often restart, though this becomes less likely closer to natural menopause age and after chemotherapy.

What this page cannot tell you

It cannot tell you whether the benefit outweighs the side effects for you. Ask your oncologist how much ovarian suppression would add.

For younger women, questions about fertility often sit at the centre of this decision, and they deserve attention before treatment starts.

Protecting fertility during chemotherapy

Injections given during chemotherapy may help protect the ovaries from damage in some women. This is different from suppression used as cancer treatment afterwards, and it does not replace egg or embryo freezing.

No pregnancy during treatment

Pregnancy is not safe during hormone therapy. Suppression injections are not reliable contraception on their own, so non-hormonal contraception such as a copper coil or condoms is usually advised.

Planning for later

If you hope to have children, discuss with your oncologist whether a planned treatment break might be possible after a few years.

An induced menopause affects more than your body. Changes in mood, energy and sexual desire can strain relationships if they are not talked about openly.

Explain what is happening

Partners and family members often do not realise that irritability, tiredness or lower interest in sex are side effects of treatment rather than personal feelings. A simple explanation can prevent a great deal of misunderstanding.

Ask for practical help

On days when sleep has been poor or symptoms are strong, sharing household work and childcare can make a real difference. Accepting help is part of staying well enough to continue treatment.