Medical Oncologist
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Removing the other breast: is contralateral mastectomy justified?
For most women, removing a healthy breast does not improve survival unless you carry an inherited gene fault or have another specific reason. It is a major operation, with real complications, on a breast that does not have cancer. This page sets out where it genuinely is justified, and why the decision does not have to be made now.
MM
Medically reviewed by Dr. Muralidhar MuddusettyConsultant Surgical Oncologist · MBBS (AIIMS), MS (Surgery, AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh) · last reviewed September 2026, next review due September 2027
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The short answer
Should I have my healthy breast removed too?
For most women, no. Removing a healthy breast does not improve survival unless you carry an inherited gene fault or have another specific reason. It is a major operation with real complications, done on a breast that does not have cancer.
Why so many women want it anyway
Because the fear of going through this again is overwhelming, and removing the other breast feels like taking control. That feeling is completely understandable. It is also, for most women, not supported by what the operation actually achieves.
What the risk really is
For a woman without an inherited gene fault, the chance of a new cancer developing in the other breast is low, and lower still if you are taking hormone tablets, which reduce it. Most women substantially overestimate it when asked.
Where it genuinely is justified
A BRCA or other high-risk gene fault, a strong family history awaiting genetic assessment, previous radiotherapy to the chest at a young age, or a breast that cannot be reliably screened. Those are real indications rather than reassurance.
If you have not had genetic testing and you are considering this, ask for it first. It may change the answer.When it makes sense
The situations where it is genuinely advised
In these cases the operation lowers a real and substantial risk.
An inherited gene fault
BRCA and certain other faults carry a high lifetime risk of a new cancer in the other breast. Here, risk-reducing surgery meaningfully lowers that risk and is properly offered.
A strong family history
Several close relatives with breast or ovarian cancer, particularly at young ages, may justify it even without a gene fault identified. Genetic counselling should come first.
Ask for a genetics referral before deciding.Previous chest radiotherapy when young
Radiotherapy to the chest in childhood or early adulthood, usually for lymphoma, raises later breast cancer risk substantially. This is a recognised indication.
A breast that cannot be watched
Where imaging is unreliable and repeated biopsies keep being needed, some women and their surgeons reasonably conclude that surveillance is not workable.
Not on this list
- Wanting the two breasts to match
- Fear alone, without added risk
- Triple negative disease by itself
Side by side
What the operation does and does not change
What it does
What it does not do
Greatly reduces new cancer in that breast
Improve survival, for most women without a gene fault
Removes the need to screen that side
Affect the cancer you already have
Can make reconstruction symmetrical
Remove all breast tissue, so a small risk remains
Ends the anxiety of watching that breast
Reliably end anxiety overall, in many women
Doubles the operating time and recovery
Come without its own complications
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Words you will hear
The vocabulary, in plain language
- Contralateral
- The other side. Here it means the breast that does not have cancer.
- Risk-reducing mastectomy
- Removing a healthy breast to lower the chance of a future cancer. Preventive mastectomy means the same thing.
- Bilateral mastectomy
- Removing both breasts. Sometimes called a double mastectomy.
- BRCA1 and BRCA2
- Inherited gene faults that substantially raise the risk of breast and ovarian cancer.
- Genetic counselling
- An appointment to discuss whether testing is appropriate and what a result would mean for you and your family.
- Symmetrisation
- Adjusting the other breast to match a reconstruction, without removing all of its tissue. An alternative worth knowing about.
Being straight with you
What to weigh honestly
This is one of the few decisions in breast cancer where what women want and what the evidence supports often diverge. A good surgeon will tell you that plainly rather than simply agreeing, and will still respect your decision once you have the facts.
The complications double
Operating on both sides means twice the risk of infection, bleeding, skin healing problems and, where implants are used, problems with them. Complications on the healthy side can delay the treatment your cancer actually needs.
Some tissue always remains
No mastectomy removes every breast cell, so a small risk persists even after surgery. The reduction is large, particularly with a gene fault. It is not absolute, and anyone promising certainty is overstating it.
Anxiety does not always lift
Women often expect the operation to end the fear. Many find the worry simply moves elsewhere, to scans, to symptoms, to the cancer already diagnosed. If fear is the main driver, counselling is worth trying before surgery, not instead of it but before deciding.
The decision can wait
It does not have to be made at the same time as your cancer surgery, and it need not be made in the first frightening weeks. Many women decide later, with genetic results in hand and treatment behind them. That is usually a better decision.
Commonly believed
What women and families say about this choice
Removing both breasts means the cancer cannot come back.
The cancer you already have can still return, in the chest wall or elsewhere in the body, and that risk is unaffected by operating on the other side. Removing a healthy breast prevents a different, new cancer. The two are separate things.
If one breast developed cancer, the other surely will.
For a woman without an inherited gene fault the risk to the other breast is low, and hormone tablets reduce it further. Most women estimate it as several times higher than it is. Ask your oncologist for your own figure.
It is the safer choice, so no doctor should argue.
It is a major operation on a healthy breast, with double the complications and no survival benefit for most women. A surgeon explaining that is doing their job. They should still support your decision once you understand it.
I need to decide now, with the cancer surgery.
You do not. The decision can be made months or years later, often better, with genetic results available and treatment behind you. Deciding in the first frightening weeks is the version most likely to be regretted.
Questions we are asked
Common questions about removing the other breast
Will it help me live longer?
For most women without an inherited gene fault, no. Survival is determined by the cancer you already have, and operating on the healthy side does not change that. Where a BRCA fault is present the picture is different, which is why testing should come before the decision.
Should I have genetic testing first?
Yes, if you are seriously considering this and have not been tested. A gene fault changes the recommendation substantially, and a negative result often changes a woman's mind. Ask for a genetics referral early, because results take time to come back.
Can I have it done later instead?
Yes, and many women do. There is no medical urgency for surgery on a breast without cancer. Waiting lets you finish treatment, get genetic results and decide without the pressure of a new diagnosis. Your surgeon can revisit it whenever you are ready.
What about matching, if I am having a reconstruction?
Symmetry is a real consideration, and there are gentler ways to achieve it. The other breast can often be reduced, lifted or augmented to match without removing all its tissue. Ask your surgeon about that before choosing a mastectomy for symmetry alone.
Does it mean I can stop having mammograms?
On that side, effectively yes, since there is little tissue left to image and follow-up becomes examination. It does not end follow-up for the cancer you had, which continues on its own schedule. Ask for your full plan in writing.
Will insurance or a scheme cover it?
Cover varies, and surgery on a breast without cancer is sometimes treated differently from cancer surgery. Ask the hospital to confirm in writing before you commit, including cover for any reconstruction, so there is no surprise afterwards.
How do I know if I am deciding out of fear?
Ask yourself what number would change your mind, then ask your oncologist for the actual figure. If no number would change it, fear is likely driving the decision, which is not shameful but is worth exploring with a counsellor before committing to major surgery.
My surgeon seems reluctant. Are they refusing me?
Usually they are making sure you have the facts, which is their responsibility for an operation with no survival benefit for most women. Ask them to set out the risks and benefits in writing. Most surgeons will proceed once satisfied you have decided with your eyes open.
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Sources
- Cancer Research UK — Risk-reducing breast surgery
- National Cancer Institute — Surgery to reduce the risk of breast cancer
- Breast Cancer Now — Risk-reducing breast surgery
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.