If you have a womb and take oestrogen-only HRT in a tablet, gel, spray or patch, the risk of cancer of the womb will increase. That’s why it’s important to take a progestogen alongside oestrogen or have an ‘in date’ Mirena coil (within five years) to protect your womb.
If you use vaginal oestrogen, you don’t need to add a progestogen as the amount you absorb into your body is tiny.
Some studies have shown a link between HRT and some types of ovarian cancer. The risk is very low. There is no evidence that taking HRT will increase your risk of dying from ovarian cancer.