HRT and cancer
There is strong evidence that using hormone replacement therapy (HRT) raises a woman’s risk of breast, ovarian and uterine cancers. At the same time, it may lower the risk of colorectal cancer.
HRT and breast cancer
Combined HRT for menopause is a known cause of breast cancer, mainly in women who recently used or are still using the therapy. There is also some evidence suggesting that estrogen-only HRT may also increase the risk of breast cancer.
HRT and ovarian cancer
Studies suggest that both combined and estrogen-only HRT increase a woman’s risk of ovarian cancer – but the risk is low.
HRT and uterine cancer
Research shows that using estrogen-only HRT increases the risk of uterine cancer.
HRT and colorectal cancer
Some studies suggest that users of combined or estrogen-only HRT may have a lower risk of colorectal cancer, while others do not. HRT is not recommended to prevent colorectal cancer.