Does cancer surgery affect milk supply?
Breast cancer surgery is usually aggressive and will significantly decrease the milk supply in the affected breast. Even if part of the breast remains, milk tissue is often badly damaged. Breast cancer may also be treated with irradiation or chemotherapy, which can damage milk tissue. Breastfeeding mothers who have had breast cancer surgery or other breast cancer treatment need to ensure that their babies are taking in enough milk. Some mothers will have enough milk as the unaffected breast can compensate by making extra milk but others may not. Breastfeeding after breast cancer does not appear to increase the risk of breast cancer returning.