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Pregnancy & breastfeeding

Breast Biopsy During — Pregnancy or Breastfeeding

Finding a lump while you are pregnant or breastfeeding is frightening. The reassuring fact is that a breast biopsy can be done safely in both situations, and most women continue feeding throughout.

Medically reviewed by Dr. Mohammed Imaduddin, Surgical Oncologist, MBBS · MS (General Surgery) · M.Ch (Surgical Oncology) · Last reviewed September 2026

  • No radiation involved — Ultrasound guides the needle throughout. No X-ray, no mammogram radiation at any point.
  • No general anaesthesia — A local numbing injection is all that is needed. You are awake and can leave the same day.
  • Feeding usually continues — Most women can breastfeed from the other side straight after, and from the biopsied side within a day or two.
  • Do not delay the biopsy — The risk of waiting is greater than the risk of the procedure. Earlier diagnosis always gives more options.
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A breast biopsy is safe to have during pregnancy and while you are breastfeeding. Core needle biopsy under ultrasound guidance is the standard approach in both situations — no radiation, no general anaesthesia. Your team makes small adjustments to keep you comfortable. Most women continue feeding without any interruption.

What happens during a breast biopsy if you are pregnant or breastfeeding?

  1. Ultrasound scan

    Your breast is scanned with ultrasound to locate the area of concern. No X-ray or radiation is used at any stage.

  2. Positioning

    You lie on your back or slightly to one side. In late pregnancy your team may use a tilted position or a cushion to keep you comfortable.

  3. Numbing injection

    A local anaesthetic is injected into the skin and the tissue just below it. The area becomes numb within a few minutes.

  4. Needle sampling

    A hollow needle is passed through the skin, guided in real time by the ultrasound screen. Several small cylinders of tissue are taken. You will feel pressure but not sharp pain.

  5. Pressure and dressing

    Firm pressure is applied for a few minutes to reduce bruising. A small dressing is placed. There are no stitches.

  6. Going home

    You go home the same day. Ask your team before you leave when to resume feeding from the biopsied side — feeding from the other breast is usually fine straight away.

What do these medical terms mean?

Core needle biopsy
A hollow needle removes several small cylinders of tissue for the laboratory. It is more accurate than a fine needle test and is the preferred technique when a clear diagnosis is needed.
Ultrasound guidance
Real-time ultrasound images show exactly where the needle is throughout the procedure. This replaces any X-ray guidance, so there is no radiation at any point.
Local anaesthetic
A numbing injection given before the needle is inserted. It works within a few minutes and lasts for one to two hours.
Lactating breast
Breast tissue that is actively producing milk. It has more blood vessels than usual, which can mean slightly more bruising, but does not make biopsy unsafe.
Galactocele
A cyst filled with milk that can appear during breastfeeding and sometimes looks like a solid lump on ultrasound. A biopsy confirms what it is.

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Does a biopsy affect your breast milk or your ability to feed?

A core needle biopsy removes a very small amount of tissue and does not cut the main milk ducts. Most women find that feeding is not affected.

Milk can leak from the biopsy site for a day or two afterwards. This is normal and settles on its own. Your team may ask you to express milk from the breast being biopsied just before the procedure, to reduce pressure in the tissue and lower the chance of leakage.

Feeding from the biopsied side may be tender for a few days. Feeding from the other side continues as normal straight after the procedure.

Is the local anaesthetic safe for your baby?

The local anaesthetic used for biopsy passes into breast milk in very small amounts. The Academy of Breastfeeding Medicine does not recommend stopping or pausing feeding after a lidocaine injection for a minor procedure.

No radiation is involved at any point in ultrasound-guided biopsy, so your baby has no radiation exposure from the procedure.

If a surgical biopsy under sedation or general anaesthesia were ever needed, your team would discuss the timing with you and advise on feeding in advance. Core needle biopsy avoids that situation for most women.

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Common questions

Frequently asked questions

Is it safe to wait until after the baby is born or I stop feeding?

It is usually not advisable to wait. A lump or suspicious area found during pregnancy or breastfeeding should be assessed without delay, because the reason for biopsy is to rule out cancer — and if cancer is present, earlier diagnosis gives more options for treatment. The procedure is safe in both situations, and the risk of delaying is greater than the risk of the biopsy itself. Your breast surgeon will advise on timing, but watching and waiting is rarely the right approach.

Do I need to stop breastfeeding before the procedure?

You do not usually need to stop breastfeeding. Your team may ask you to express milk from the breast being biopsied just before the procedure, to reduce pressure in the tissue and lower the chance of milk leaking from the needle site. This is a practical step, not a reason to stop feeding altogether. Feeding from the other breast continues as normal throughout.

Can I breastfeed straight after the biopsy?

You can usually feed from the other breast straight away. From the biopsied side, your team will advise you based on how the area looks and how tender it is — a day or two of reduced pressure on that side often helps with healing. Ask before you leave what to expect and when to call if something does not seem right.

Will the wound heal normally while I am still feeding?

Healing is generally similar to a non-breastfeeding woman. The main difference is that the lactating breast has more blood vessels, which can mean slightly more bruising than usual. Milk leakage from the biopsy site settles within a day or two. Contact your team if you notice increasing redness, warmth, or swelling that does not start to improve after 48 hours.

I already had a fine needle test. Why do I need a core needle biopsy?

A fine needle aspiration takes cells rather than tissue. In a lactating breast this can be difficult to interpret, because milk-producing cells change shape and can look unusual under the microscope. A core needle biopsy takes a small cylinder of tissue, which gives the pathologist more information and a more reliable result. ASCO guidance recommends core needle biopsy as the standard approach when a fine needle result is inconclusive or when the clinical picture needs confirmation.

What if the biopsy confirms cancer — can I be treated while pregnant?

Yes, in many situations. Surgery can generally be performed safely in the second trimester. Some chemotherapy regimens have been used after the first trimester with close monitoring. Radiation is usually deferred until after delivery. Your breast surgeon and oncologist work with your obstetrician to plan treatment that addresses the cancer while protecting the pregnancy. We do not yet have long-term data on every regimen in every situation, and your team should be clear with you about what is established and what is less certain.

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