This article has been reviewed by Sheri Rodriguez, IBCLC. However, this review does not constitute a warranty of medical accuracy and is not intended as medical advice. Always consult a qualified healthcare provider or lactation consultant before making decisions about your health or your child’s health.
A breast cancer diagnosis raises a lot of urgent questions—especially if you’re currently breastfeeding. The truth is that breastfeeding with breast cancer is sometimes possible, but it depends entirely on your treatment plan.
You are not alone in navigating this, and you don’t have to figure it out in isolation.
First, a Big Truth
A breast cancer diagnosis does not mean you automatically have to stop breastfeeding forever. But whether you can continue depends on the type of treatment, your surgery history, and what your medical team recommends. Every situation is different.
The American Cancer Society (ACS) notes that breastfeeding during certain cancer treatments (like chemotherapy, targeted therapy, or hormone therapy) is unsafe because these medicines can pass into breast milk and potentially harm the baby.
Breastfeeding With Breast Cancer After Surgery
If your treatment includes surgery, breastfeeding with breast cancer may still be possible:
- Lumpectomy or mastectomy: If you’ve had surgery on one breast, you can still breastfeed from the other. The Centers for Disease Control and Prevention (CDC) confirms that women who have had breast surgery may have reduced milk supply, but often can still produce milk, especially with support from a lactation consultant.
- Scarring and ducts: Surgery may affect milk ducts or nerves, which can impact let-down and supply, but it doesn’t necessarily mean breastfeeding isn’t possible.
Breastfeeding During Treatment
What if you are currently undergoing treatment? Here’s what the experts say is safe for breastfeeding―and what’s not.
- Chemotherapy & targeted therapy: Not safe. Experts explain that chemo drugs can be excreted in breast milk and pose risks to infants.
- Radiation therapy: Radiation to the breast can damage tissue and affect milk production in that breast. However, you may still be able to nurse, it’s best to discuss with your doctor.
- Hormone or immunotherapy: These drugs are also not considered safe during breastfeeding.
What About Pumping?
Sometimes moms undergoing treatment “pump and dump” (discard milk) to keep supply active until treatment is complete. Your doctor and a lactation consultant can guide you through whether this makes sense for your situation.
Breastfeeding After Cancer
There’s a lot to be grateful for when you complete breast cancer treatment. And here’s one more for breastfeeding moms in that category: The POSITIVE trial (a prospective study of hormone receptor–positive survivors who paused endocrine therapy to conceive) found that breastfeeding doesn’t raise the risk of cancer coming back. At a median follow-up of 41 months, the chance of a recurrence or new cancer within two years of giving birth was nearly identical—3.6% for women who breastfed and 3.1% for those who didn’t—a difference so small it lands squarely within the margin of statistical uncertainty, meaning no meaningful risk increase.
More good news: Over half of the breastfeeding participants nursed for more than four months (median duration was 4.4 months). This is especially powerful for young survivors weighing the emotional and physical desire to breastfeed—you’re not just surviving, you’re thriving (and nourishing!).
The Emotional Side
Breast cancer and breastfeeding both demand an incredible amount of emotional energy. The World Health Organization (WHO) emphasizes that mothers facing health challenges should receive practical and emotional support to make feeding decisions that feel safe and sustainable.
It’s okay to grieve if breastfeeding looks different than you imagined. Formula feeding, donor milk, or partial breastfeeding are all valid ways to nourish your baby while continuing to care for your health.
Bottom Line
Breastfeeding with breast cancer is not a simple yes-or-no situation.
Yes, it is sometimes possible to breastfeed with breast cancer, but it depends entirely on your treatment plan. Chemo, radiation, and hormone therapies usually mean you’ll need to pause breastfeeding, but surgery alone doesn’t always close the door.
Most importantly: You don’t have to navigate this alone. Your oncologist, OB-GYN, and a lactation consultant can team up to help you find the safest and most nourishing option for both you and your baby.
Everyboob Reminder: Feeding your baby—by breast, bottle, or both—doesn’t define your strength. Surviving and thriving through cancer while caring for your baby already proves you’re the ultimate superhero.
