Breast cancer while breast-feeding: What you need to know

Women who know they have breast cancer are likely to have concerns about the safety of breast-feeding and may wonder whether their cancer treatment could affect the baby.

In this article, we provide more information about the relationship between breast cancer and breast-feeding.

Can you get breast cancer while breast-feeding?

It is possible to develop breast cancer while breast-feeding a baby, but it is rare. Breast-feeding women account for 3 percent of breast cancer cases.

According to the National Cancer Institute, some research suggests that the risk of breast cancer is temporarily higher in the years following pregnancy and childbirth.

This increased risk may be the result of hormonal changes during pregnancy.

Overall, however, breast-feeding lowers the risk of breast cancer, especially in premenopausal women.

The months of pregnancy and breast-feeding will decrease the number of menstrual cycles that a woman has in her lifetime. This will reduce her exposure to hormones that can increase the risk of certain cancers.

Despite the low risk, women should speak with a doctor if they have any concerns about their breast health.

Several factors can make it more difficult for women who are lactating to get a breast cancer diagnosis. These include the following:

  • Breast-feeding can cause issues that are very similar to the symptoms of breast cancer.
  • Doctors may not think to test a woman for cancer if she finds a lump while breast-feeding as there are other possible causes.
  • Mammograms and breast ultrasounds are more likely to give a false positive or inconclusive result during lactation.

Mastitis is inflammation or infection of the breast. It is most likely to occur following engorgement or a plugged duct.

If the milk gets stuck in the breast, milk proteins can build up and eventually start to leak into the surrounding tissue.

In addition to a lump, mastitis can cause the following symptoms:

  • redness on the breast
  • fever
  • shivers
  • feeling unwell

A woman with mastitis should continue to breast-feed. Breast-feeding can help drain the trapped milk from the tissue, which is the best way to relieve symptoms.


An abscess is a rare but dangerous complication of untreated mastitis. It is one of the ways that the body deals with an infection to prevent it from spreading throughout the body.

The center of an abscess contains a pocket of pus and bacteria. Once an abscess forms, the infected tissue in the center cannot escape.

An abscess needs urgent medical care, and treatment will include drainage and antibiotics. Anyone who thinks they may have an abscess should speak to a doctor as soon as possible.


Small cysts, known as galactoceles, can sometimes form in the breast. They contain milk and may come and go depending on how much milk is in the breast.

These small lumps are not usually painful and will disappear once lactation is complete.

In most cases, the doctor will recommend that a woman stops breast-feeding following a breast cancer diagnosis.

Many breast cancer treatments can affect a woman’s milk supply or negatively impact on the baby.

The doctor will help to determine which treatment is best for an individual with breast cancer, as this can vary from person to person.

Possible treatments include:

  • Surgery: Surgery may be necessary to remove a lump or cancerous growth. In some cases, this can involve a mastectomy (removal of the breast) or a double mastectomy (removal of both breasts). The extent of the surgery will determine whether or not the individual can continue breast-feeding.
  • Chemotherapy: Chemotherapy uses strong medications to destroy cancer cells within the body. Women who are having chemotherapy will need to stop breast-feeding.
  • Radiation: Some women undergoing radiation treatment may be able to continue breast-feeding, depending on the specific type of therapy. A doctor will be able to explain the risks to allow the individual to make an informed decision.

Breast-feeding during cancer treatment may be possible, but it is essential to speak to a doctor before and during the treatment process.


Developing breast cancer while breast-feeding is rare, but it is possible. Women should not hesitate to see their doctor if they have any concerns about their breasts.

In the event of a breast cancer diagnosis, the woman should discuss her options with the doctor, including whether or not she can continue to breast-feed.

Women should also make sure to have a regular checkup and clinical breast exam each year.

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