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Breast Cancer Awareness Month: Does Birth Control Up Breast Cancer Risk? See What A New Study Says

Breast Cancer Awareness Month: Does Birth Control Up Breast Cancer Risk? See What A New Study Says

October is Breast Cancer Awareness Month! The increasing breast cancer awareness comes at a time when women can find substantial improvements in breast cancer prevention and treatment.

If you want to avoid an unwanted pregnancy, taking birth control is usually a no-brainer. But what if that same birth control upped your risk of breast cancer?

According to a new research published in The New England Journal of Medicine, women who take hormonal birth control pills or use hormonal IUDs for years experience a small yet significant increase in their risk of breast cancer compared to those who don’t.

The research followed 1.8 million Danish women for more than 10 years and found that, for every 100,000 women, hormonal birth control caused an extra 13 cases of breast cancer a year. Specifically, there were 55 breast cancer cases each year among the 100,000 women who didn’t use hormonal birth control, and 68 cases of breast cancer among those who did.

The study didn’t find any big distinctions between the hormonal method women used—those who used combined oral contraceptives (which use estrogen and progestin) and those who used progestin-only methods each had a higher risk. Ditto for whether women used a hormonal IUD or took a pill.

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The study also found that a woman’s risk went up the longer she used hormonal birth control. So, obviously, hormones are to blame for the increased risk, but the exact mechanisms aren’t yet known.

But before you panic, know this: The birth control-breast cancer link actually isn’t news to many doctors. Previous research has found a link between ongoing hormonal contraceptive use and breast cancer, points out Jack Jacoub, M.D., a medical oncologist and medical director of MemorialCare Cancer Institute at Orange Coast Medical Center in Fountain Valley, California.

For instance, a large-scale 2010 study found that birth control pills came with a “marginally significant higher risk” of breast cancer. However, older versions of hormonal birth control had more estrogen than current versions, and many medical professionals have assumed that the risk has been lowered with the newer versions.

Still, “we’ve known this for a long time,” Jacoub says. Jacoub says that women “definitely should not freak out about this,” but notes that it’s good to be aware of the risks.

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Given that being on hormonal birth control for a long period of time raises your risk, he says it’s a good idea to try to cut back on how long you use it or, at least, try to swap in some non-hormonal methods after you’ve been on a hormonal method for years.

If you have a strong family history of breast cancer, Jacoub says it’s a good idea to talk to your doctor about potentially switching to a non-hormonal birth control method. So, for example, you might switch from a hormonal IUD to the copper version.

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Ultimately, though, you shouldn’t stress about this. Just be aware and informed about the pros and cons of any birth control method you use. Breast cancer development depends on a whole slew of factors, Jacoub says, and taking hormonal birth control alone is unlikely to cause you to develop breast cancer.



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