What Is a Mastectomy?

Few conversations in a clinic room carry as much weight as this one. You’ve had the mammogram, the biopsy results are back, and now your surgeon is talking about operations — and one of the words on the table is mastectomy. If you’re reading this the night after that appointment, this page is for you: what the operation actually is, what the different versions mean, and, just as importantly, what the days around it tend to feel like.

A mastectomy is surgery to remove all of the breast tissue from a breast. As the short video at the top of this page — “Mastectomy”, just over a minute long — puts it, it’s done as a way to treat breast cancer, and sometimes to prevent it in people whose risk is unusually high. For early-stage breast cancer it may be one of the treatment options, sitting alongside breast-conserving surgery, where only the lump and a margin of surrounding tissue are removed. Which of those is right is never a decision a webpage can make for you, but understanding what each one involves makes the conversation with your team a much easier one to be part of.

The versions you may hear named

The word mastectomy covers a family of operations, and the differences between them are mostly about how much is removed beyond the breast tissue itself.

A simple (or total) mastectomy removes the whole breast, including the nipple, but leaves the lymph nodes under the arm and the chest muscles alone. A modified radical mastectomy removes the breast together with most of the lymph nodes in the armpit — a second video on this site, "Modified Radical Mastectomy", describes exactly that combination and notes that the large chest muscle is spared, which is what "modified" means in the name. You may also hear about skin-sparing and nipple-sparing versions, where much of the breast’s outer envelope is kept — usually because reconstruction is planned at the same operation — and about operations on both breasts, which some people choose when cancer is in one breast and risk in the other is high, or to prevent cancer when inherited risk is strong.

You might also hear the older term radical mastectomy, which removed the chest muscle as well. It’s rarely done now, and if it appears in something you’re reading, check the date — surgical practice has moved on. Our cancer condition hub gathers the site’s wider cancer guides in one place, and our article on what a biopsy is and how results are read explains the step that usually leads up to this conversation.

Before the operation day

In the days before surgery you’ll usually meet the surgeon — and, if reconstruction is being considered, sometimes a plastic surgeon at the same clinic — to settle which version of the operation is planned and whether the lymph nodes under the arm will be sampled or removed. A common part of that plan is checking the first lymph node the breast drains to, often called the sentinel node, because its result helps the team understand whether cancer has spread beyond the breast.

Expect the ordinary pre-operative routine as well: questions about your health and medicines, blood tests, and clear instructions about when to stop eating and drinking. It’s also worth sorting the practical things while you have time — a front-opening top to wear home, someone to drive you, and meals in the freezer. Small preparations like those sound trivial now and feel anything but trivial afterwards. If screening is what brought you here, our guide to what a mammogram is and how it’s done covers that earlier step.

What happens on the day

Mastectomy is done under a general anaesthetic, so you’ll be fully asleep and feel nothing during the operation. When you wake up in recovery, the chest on the operated side will be covered by a dressing, and most people have one or two soft tubes — drains — coming from the wound area into small bottles or bulbs. The drains collect fluid that would otherwise gather under the skin while healing gets under way; they look more alarming than they feel, and the nursing team will show you how they’re managed before you go home, if you go home with them still in.

How long you stay varies. Some people go home the next day, others stay a few nights — it depends on the extent of the surgery, whether reconstruction was done at the same time, and how you’re recovering. Pain is usually managed with a combination of pain relief given in hospital and tablets to take home, and it’s normal for the chest and underarm area to feel tight, sore and partly numb. Numbness around the scar and under the arm is very common, because small skin nerves are inevitably disturbed by this surgery, and it can linger long after everything else has healed.

The first weeks afterwards

Recovery at home is mostly about pacing yourself. You’ll be encouraged to move your arm and shoulder gently from early on — the team will usually give you specific exercises — because keeping the shoulder moving helps prevent stiffness, even though heavy lifting and strenuous use of that arm need to wait until your team says otherwise. The drains, if you have them, are typically removed once the fluid slows down, often within the first week or two, at a clinic visit.

You should also know about one longer-term point if lymph nodes under your arm were removed or sampled: that arm can be more prone to swelling, called lymphoedema, for a long time afterwards. Your team will explain the precautions that apply to you — they’re the reason you may be advised to have blood tests and blood pressure taken on the other arm where possible. And do get in touch with your team promptly, rather than waiting for a routine appointment, if you develop spreading redness or warmth around the wound, a fever, fluid collecting under the skin that keeps growing, or pain that’s getting worse instead of better.

There’s an emotional side to this that deserves naming plainly: looking at the scar for the first time, and adjusting to a changed shape, is hard for many people, even those who feel certain the operation was the right choice. That’s a normal part of this — not a sign you’re coping badly — and breast care nurses and support organisations exist precisely for it. Our article on how to do a breast self-examination remains relevant for the remaining breast and for general breast awareness after treatment.

Reconstruction, prostheses, and going flat

Removing the breast is only half the shape question; the other half is what, if anything, replaces it. Reconstruction rebuilds a breast shape using an implant or tissue moved from elsewhere in your own body, and it can be done during the same operation as the mastectomy or months or years later — it does not have to be decided under pressure at diagnosis. Some people wear an external prosthesis inside a bra instead, and some choose to "go flat" and wear neither. All three are legitimate choices, and people change their minds in both directions; a later reconstruction remains possible for many who first go flat. If reconstruction interests you, ask to meet the plastic surgery team before the mastectomy date is fixed, because some options are easiest when they’re planned together.

Finally, remember where this operation sits in the bigger picture. Mastectomy is one part of breast cancer treatment, not the whole of it: depending on the biopsy results and the tissue removed, your team may also discuss radiotherapy, hormone-blocking tablets, chemotherapy or targeted medicines, and follow-up scans. The pathology report on the removed tissue often shapes those next steps, which is why the follow-up appointment after surgery matters so much — it’s where the full picture, and the plan built on it, comes together.

References & further reading

• MedlinePlus — Mastectomy: https://medlineplus.gov/ency/article/002919.htm
• MedlinePlus — Breast Cancer: https://medlineplus.gov/breastcancer.html
• National Cancer Institute — Breast Cancer: https://www.cancer.gov/types/breast
• Breastcancer.org — Mastectomy: What to Expect: https://www.breastcancer.org/treatment/surgery/mastectomy/what-to-expect

Frequently Asked Questions

Is a mastectomy the only option for breast cancer?

Often not. For many early-stage cancers, breast-conserving surgery — removing the lump with a margin of tissue, usually followed by radiotherapy — is an alternative your surgeon will discuss. In other situations, because of the cancer’s size, position or pattern, mastectomy is the option recommended. The balance depends on your individual results, which is why this is a conversation with your own team.

Will I need my lymph nodes removed too?

Sometimes. The nodes under the arm are often checked — commonly by sampling the first draining (sentinel) node — because the result helps stage the cancer and plan further treatment. Whether more nodes are removed depends on what that sampling shows and on your surgeon’s plan, which they’ll explain before the operation.

How long does recovery take?

It varies with the extent of surgery and whether reconstruction was done at the same time. Many people are up and moving gently within days, with shoulder exercises starting early, but tiredness and soreness commonly last several weeks, and full recovery takes longer. Your team will give you a timeline based on your operation — treat general pages like this one as a rough map, not a schedule.

Can I have reconstruction later if I don’t want it now?

In many cases, yes. Reconstruction can be immediate (during the same operation) or delayed by months or years, and choosing neither reconstruction nor a prosthesis — going flat — is also a valid choice. If you might want reconstruction one day, mentioning that before your mastectomy helps the team plan with it in mind.

Does mastectomy mean I won’t need any other treatment?

Not necessarily. Surgery removes the visible cancer, but depending on the pathology results your team may also recommend radiotherapy, hormone-blocking treatment, chemotherapy or targeted medicines to reduce the risk of the cancer returning. The follow-up plan is built once the full results are in.

MedicalVideos.com has published trusted medical videos since 2007. The site was founded by Dr. Mohamed Ibrahim, MD, PhD — physician-scientist.

Educational only — this article is general information about mastectomy, not medical advice and not a diagnosis. Whether this operation, or any operation, is right for you is a matter for your own surgical and oncology team, who know your results and your history.