Can removing breasts prevent breast cancer?

This operation is called a risk-reducing or preventive mastectomy. It is generally considered for people with a clearly elevated risk rather than as routine prevention for everyone.

A surgeon removes as much breast tissue as is safely possible. Tiny amounts can remain in the skin, chest wall, or around the nipple, so breast cancer can still develop after surgery. Removing one breast after cancer in the other does not treat cancer elsewhere in the body.

Personal risk may depend on an inherited gene variant, a strong family history, previous chest radiotherapy, biopsy findings, age, and other health factors. Genetic counselling and a specialist breast-risk assessment can help place these factors in context. A tumour gene-expression test answers a different question: it may guide treatment for an existing cancer, not determine inherited risk.

Discuss alternatives before choosing surgery. Depending on your risk and preferences, these may include planned clinical examinations, mammograms, breast MRI, and risk-reducing medicine. A breast biopsy may be needed for a suspicious finding, but biopsy itself does not prevent cancer.

Meet a breast surgeon and, if you are considering reconstruction, a reconstructive surgeon. Ask about nipple preservation, implant-based or tissue reconstruction, going flat, loss of breast and nipple sensation, scars, recovery, future screening, and the possibility of further procedures. Fertility, body image, sexuality, work, caregiving, and emotional wellbeing deserve space in the decision.

Before any operation, arrange a breast assessment promptly for a new lump, nipple discharge containing blood, skin dimpling, a new nipple change, or persistent one-sided breast or armpit change. These symptoms need evaluation rather than assuming preventive surgery is the next step.

After mastectomy, seek prompt advice for spreading redness, fever, worsening swelling, pus, an opening wound, sudden breathlessness, chest pain, or new calf swelling. Follow the surgical team’s instructions for drains, dressings, and after-hours contact.

Ask how your individual risk was estimated, whether genetic counselling or testing is appropriate, and how surgery compares with surveillance and medicine for you. Request an explanation of what tissue would be removed, reconstruction choices, likely sensation changes, recovery support, and follow-up after healing.