Breast cancer is very common. Each woman in the UK has a 1 in 7 chance of developing breast cancer, regardless of whether they take HRT or not. This means that if you take HRT your risk of breast cancer is 1 in 7, and for women who do not take HRT the risk is also 1 in 7.

What are the risk factors?

There are certain factors that increase your risk of developing breast cancer and these include simply getting older, being overweight, drinking alcohol, smoking, not exercising regularly, and having young family relatives who have had breast cancer. However, many women develop breast cancer without any of these risk factors.

The most common reason that women are scared of HRT is the fear of breast cancer associated with taking HRT. However, much of this fear is not based on evidence and there has been inaccurate reporting about this risk, both in the medical press and public media, over the past 20 years.

There are many different types of HRT and they have different risks associated with them. Many types of HRT actually have no risks associated with them. All types of HRT have benefits as they improve symptoms as well as improve future health. When people talk about the risks of HRT it is important to be clear which type of HRT they are talking about.

Young women taking HRT do not have a greater risk of breast cancer

Women who are under 51 years of age have absolutely no increased risk of getting breast cancer, regardless of the length of time they take HRT for. This is because women who take HRT when they are young are simply replacing the hormones that their bodies should otherwise be producing. The average age of the menopause in the UK is 51 years.

It is really important that women and doctors are aware of this. If you do not have the correct type and strength of HRT when you are young, you will have an increased risk of developing heart disease, diabetes, osteoporosis and dementia in the future, as the hormone estrogen is so important for your body to function properly. Taking HRT reduces these risks.

Women who have had a hysterectomy and take HRT do not have a greater risk of breast cancer

Numerous studies have shown that women who take estrogen-only HRT do not have a higher risk of breast cancer. Some studies have actually shown these women have a lower risk of breast cancer than women not taking HRT.

The increased risk of breast cancer with taking combined HRT is very low or not increased at all

Some studies show that taking combined HRT (HRT containing both estrogen and a progestogen) may be associated with a very small increased risk of breast cancer.

However, the media have misinterpreted this information and presented the risk as far greater than it actually is, leading women to feel confused and anxious about the perceived risk of breast cancer.

The increased risk is related to the type of progestogen in the HRT. Taking micronised progesterone (the body identical progesterone) has never been shown in studies to be associated with an increased risk of breast cancer.

Even for women taking the older types of progestogen, the risk is very low. A recent review of all the research studies concluded that current scientific evidence (for older types of progestogen) does not confirm, or dispute, that taking HRT causes breast cancer.

The level of increased risk of breast cancer, with the older types of combined HRT (in the studies that have shown a possible small increased risk) is actually less than the level of risk of breast cancer that any woman has if they are overweight or drinks around two glasses of wine a day.

In addition, there is no evidence that shows there is an increased risk of death from breast cancer, in women who take HRT. Studies have actually shown that women who take any type of HRT have a lower risk of dying from breast cancer, as well as other cancers, compared to women who do not take HRT.

If you have a strong family history of breast cancer, or have had breast cancer yourself in the past, you might still be able to take some types of HRT. It is best to discuss your options with your GP, or a doctor who specialises in the menopause.

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