Will a double mastectomy prevent breast cancer?

A double mastectomy, also called bilateral mastectomy, removes breast tissue from both sides. It may be considered for someone with cancer in one breast, a high inherited risk, or another carefully assessed risk pattern. Because a small amount of breast tissue can remain near the skin, chest wall, or underarm, the operation cannot make future cancer risk disappear.

The decision is separate from questions about reconstruction and may involve genetics, imaging, biopsy results, family history, age, other health conditions, and personal preferences. If cancer is already present, removing both breasts does not by itself treat cancer cells that may have travelled elsewhere. The wider treatment plan may include surgery, medicines, or radiotherapy.

Ask a breast surgeon and, when relevant, a genetics specialist to explain your individual risk and alternatives. Review what each operation removes, possible effects on sensation and recovery, reconstruction choices, and follow-up needs. Bring your imaging and biopsy questions to the consultation; a second opinion can help when the choice feels difficult.

After surgery, contact the care team for increasing redness, swelling, drainage, wound separation, fever, or pain that is getting worse. Seek urgent help for breathing difficulty, chest pain, sudden confusion, or heavy bleeding. At any time, report a new chest-wall lump, skin change, or persistent swelling in the underarm.

Ask what risk reduction is realistic for you, whether one or both sides are advised, what genetic or tissue information changes the decision, and how cancer treatment or reconstruction fits the timing.