Pregnancy After Breast Cancer

Many women are able to become pregnant after treatment for breast cancer. However, some treatments can make it harder to get pregnant. If you think you may want to have children one day, or just want to keep your options open, the best time to talk to your doctor about fertility is before you begin breast cancer treatment.

Breast cancer is most common in older women. But if you are a younger woman who has had breast cancer, you might have questions about how breast cancer could affect your ability to have children and whether there are any extra risks.

Can I have a baby after having breast cancer?

Some treatments for breast cancer may affect a woman’s fertility (ability to have a baby). For example, chemotherapy for breast cancer might damage the ovaries, which can sometimes cause immediate or delayed infertility. Still, many women are able to become pregnant after treatment. The best time to talk with your doctor about fertility is before starting breast cancer treatment. For more about how cancer treatment can affect fertility, see Fertility and Women With Cancer.

Could pregnancy and breastfeeding make my breast cancer come back?

Many breast cancers are sensitive to estrogen, so there has been concern that for women who have had breast cancer, the high hormone levels that result from a pregnancy might increase the chance of the cancer coming back. Studies have shown, though, that pregnancy does not increase the risk of the cancer coming back after successful treatment.

There’s also no proof that breastfeeding after breast cancer treatment increases the risk of recurrence. In fact, some research suggests having a history of breastfeeding might actually lower the risk of the cancer coming back.

How long after breast cancer treatment should I wait before becoming pregnant?

If you want to have children, some doctors advise breast cancer survivors to wait at least 2 years after all treatment has finished before trying to get pregnant. The best length of time to wait is not clear, but 2 years is thought to be enough time to find any early return of the cancer, which could affect your decision to become pregnant. Keep in mind that this advice is not based on data from any clinical trials. And some breast cancers can come back after the 2-year mark, so every case is different. Your decision should be based on many things, including your age, desire for more pregnancies, type of breast cancer, and the risk of the cancer coming back early.

If I get pregnant, would my history of breast cancer put my baby at risk?

There is no proof that a woman’s past breast cancer has any direct effect on her baby. Researchers have found no increased rate of birth defects or other long-term health concerns in children born to women who have had breast cancer.

Could breast cancer treatment affect my unborn baby?

If you are still getting any type of treatment for breast cancer, including chemotherapy, hormone therapy, or targeted therapy, talk to your doctor before trying to become pregnant. These drugs could affect a growing fetus, so it is safer to wait until all treatment is complete before getting pregnant. It’s also important to remember that stopping treatment early can increase the risk of the cancer growing or coming back. See Treating Breast Cancer During Pregnancy for more on this.

Can I breastfeed after breast cancer treatment?

If you have had breast surgery and/or radiation, you may have problems breastfeeding from the affected breast. Studies have shown reduced milk production in that breast as well as structural changes that can make breastfeeding painful, or make it difficult for the baby to latch onto the breast. Still, many women are able to breastfeed.

If you are still taking any medicines to treat your breast cancer (such as hormone therapy), it’s very important to talk with your doctor before trying to breastfeed. Some drugs can enter the breast milk and might affect the baby.

Talk to your doctor

If you have or have had breast cancer and are thinking about having children, talk with your doctor about how treatment could affect your chances for pregnancy. This discussion should also cover the risk of the cancer coming back. In many cases, counseling can help you sort through the choices that come with surviving breast cancer and planning a pregnancy.

The American Cancer Society medical and editorial content team
Our team is made up of doctors and master’s-prepared nurses with deep knowledge of cancer care as well as journalists, editors, and translators with extensive experience in medical writing.

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Hickey M, Peate M, Saunders CM, Friedlander M. Breast cancer in young women and its impact on reproductive function. Hum Reprod Update. 2009;15:323-339.

Kwan ML, Bernard PS, Kroenke CH, et al. Breastfeeding, PAM50 tumor subtype, and breast cancer prognosis and survival. J Natl Cancer Inst. 2015 Apr 28;107(7).

National Cancer Institute. Breast Cancer Treatment and Pregnancy (PDQ®). 2017. Accessed at www.cancer.gov/types/breast/hp/pregnancy-breast-treatment-pdq on July 27, 2017.

Last Medical Review: August 21, 2017 Last Revised: August 21, 2017

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