Oestrogen side effects on HRT

Common oestrogen side effects

You might hear these called oestrogenic side effects, but they can vary among individuals based on dosage, method of administration, and personal health history. Here are the most frequently observed:

• Bloating and nausea: These digestive system reactions are quite common.
• Headaches: Some individuals might experience mild to severe headaches.
• Mood swings: Emotional fluctuations can occur.
• Fluid retention: There may be mild swelling and hands and feet.

Other symptoms include spotting and irritation where you wear a patch. Some side effects settle within a few weeks. If yours are bothering you or aren’t going away, ask your pharmacist or prescriber for advice.

What are the side effects of too much oestrogen?

Tender breasts, nausea, and vaginal bleeding can happen if you use more oestrogen than prescribed. These symptoms can happen at your usual dose too, so they can’t tell you on their own that your dose is too high. If they started after a dose change, ask your prescriber to review your treatment.

If you’ve used more than prescribed and have symptoms, speak to a pharmacist urgently. Call NHS 111 if you can’t reach one.

Longer-term HRT risks

Oestrogen-only HRT carries little or no extra breast cancer risk, however, combined HRT can increase that risk. Blood clot risk is higher with tablets than with patches, gels, or sprays. If you have a womb, you’ll usually need a progestogen alongside oestrogen to help protect its lining. See the NHS guide to HRT benefits and risks.

When to get medical help

• Call 999 for sudden chest pain, difficulty breathing, signs of a stroke, or sudden swelling of your lips, tongue, or throat.
• Call NHS 111 for other suspected serious side effects, such as a painful, swollen leg or yellowing of your skin or eyes.
• Tell your GP or HRT prescriber about unexpected vaginal bleeding. Get advice promptly if it’s heavy, lasts a long time, or happens outside the usual settling-in windows – the first six months after starting HRT or the first three months after changing the dose or type.

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication.