Can a Fibroadenoma or Its Removal Affect Breastfeeding?

Yes, both a fibroadenoma and its removal can influence your breastfeeding experience, but having one does not mean you cannot breastfeed. An untreated, benign fibroadenoma generally does not obstruct milk production ^[1][2]. Most people who may become pregnant or breastfeed can successfully nurse with a fibroadenoma, often using both breasts or primarily relying on the unaffected breast. However, if you choose to have the lump removed, the procedure can sometimes impact the nearby milk ducts or nerves. Because direct evidence on how specific treatments affect future milk supply is limited, it is critical to discuss your family planning goals with your care team before choosing a treatment.

Untreated Fibroadenomas During Pregnancy and Breastfeeding

If your fibroadenoma has been confirmed through a core-needle biopsy (a procedure that uses a hollow needle to remove a small tissue sample) and the pathology results perfectly match what the doctor sees on your imaging, this is called an “imaging-pathology concordant” diagnosis ^[1][3]. For concordant, benign fibroadenomas, doctors often recommend observation rather than immediate removal ^[1].

Leaving the fibroadenoma untreated does not inherently harm your milk ducts ^[1]. However, pregnancy and lactation cause massive hormonal shifts that can make a fibroadenoma grow rapidly ^[4]. Some fibroadenomas may also shrink after you finish breastfeeding.

While growth during pregnancy is common, a changing mass should never automatically be assumed to be harmless. You should seek prompt clinical assessment if you notice:

• Rapid enlargement of the lump
• The lump becoming hard or fixed in place
• Bloody nipple discharge
• Redness, fever, or worsening pain
• Changes to the skin or the nipple retracting inward

These symptoms require evaluation (such as a safe ultrasound or biopsy) to rule out other conditions, including infections or other types of tumors ^[5][6].

How Removal Methods Impact Breastfeeding

If you and your doctor decide to treat the fibroadenoma, the method used will determine the potential risks to your glandular tissue (the part of the breast that makes milk), your milk ducts, and your nipple sensation. It is important to know that most studies on fibroadenoma removal measure cosmetic success and recurrence rates, not future milk supply ^[7][8]. Therefore, no procedure can be guaranteed to perfectly preserve your ability to breastfeed.

Open Excision (Lumpectomy)

Open surgery removes the lump along with some surrounding tissue. It has the potential to disrupt milk ducts and alter nipple sensation, heavily depending on where the incision is made ^[9][10]. Periareolar incisions (cuts made around the border of the areola) carry a higher risk of damaging the major ducts and nerves compared to incisions placed in the natural folds of the breast ^[10][11]. Nipple sensation is important because it helps trigger the milk-ejection reflex (the “let-down” of milk), though losing some sensation does not make breastfeeding impossible.

In a study of women who gave birth after having benign breast surgery, 91% were able to breastfeed at least to some degree ^[12]. However, nearly 30% of those individuals voluntarily reduced feeding from the operated breast, which the researchers noted could be due to physical changes or psychological discomfort related to the surgery ^[12].

Vacuum-Assisted Excision (VAE)

Vacuum-assisted excision (VAE) uses a needle-like vacuum probe through a tiny cut to remove the fibroadenoma ^[13]. While VAE uses a smaller incision than open surgery, it still removes breast tissue and can intersect milk ducts if the lump is located near them. VAE can also cause a hematoma (a collection of blood) or localized skin depression, especially if the fibroadenoma is close to the skin surface ^[14][15].

Cryoablation

Cryoablation freezes and destroys the fibroadenoma in place using extreme cold, without physically removing the tissue ^[13]. Over time, the dead tissue shrinks and leaves behind a small scar ^[16][17]. Because cryoablation does not provide a final tissue specimen for a pathologist to examine, it is only an option if your initial biopsy diagnosis is absolutely certain. While it avoids surgical cuts and has a low complication rate, it can still affect nearby tissue and is not proven to protect future breastfeeding better than other methods ^[17].

Timing and Safety Concerns

If you are planning to become pregnant or are currently breastfeeding, the timing of any breast procedure requires careful discussion:

• Elective Removals Are Often Deferred: During pregnancy and lactation, increased blood flow and swelling in the breast raise the risks of bleeding, infection, and delayed wound healing ^[18]. Because of this, elective removals are often scheduled for well before conception or after a patient has finished breastfeeding.
• The Risk of Milk Fistula: Having a biopsy or breast surgery while lactating carries a small risk of developing a milk fistula—a rare complication where milk continuously leaks from the surgical tract ^[11]. While this sounds alarming, it is usually manageable, often stops on its own, and does not automatically mean you must stop breastfeeding ^[11].
• Do Not Delay Urgent Care: There is no universal waiting interval for procedures. If you develop a concerning new lump or a rapid change during pregnancy or lactation, a necessary ultrasound or biopsy should never be postponed ^[4]. Safe diagnostic tools are available for pregnant and nursing patients.

A lactation consultant can be an invaluable resource if you have had breast surgery, helping you maximize your supply and navigate feeding from one or both breasts.