Medical Oncologist
Before your operation
Anaesthesia and fitness for breast cancer surgery
Almost everyone is fit enough for breast cancer surgery. It is a short operation that does not enter the chest or abdomen, and age alone almost never rules it out. This page explains what the pre-operative assessment actually checks, which medicines you must declare, and what the risks honestly are.
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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On this page
The short answer
Am I fit enough for the anaesthetic?
Almost everyone is. Breast surgery is not a long operation and it does not open the chest or abdomen, so it is one of the gentler procedures on the body. Age alone almost never rules it out, and neither does diabetes or high blood pressure that is under control.
What the anaesthetist is actually checking
Whether your heart and lungs can manage the anaesthetic, whether any medicine you take needs adjusting, and whether anything about your airway makes the breathing tube difficult. They are planning the anaesthetic, not deciding whether you deserve the operation.
Where problems usually come from
Not from the surgery, but from conditions nobody knew about: poorly controlled diabetes, undiagnosed heart disease, or a chest infection on the day. This is exactly what the pre-operative assessment exists to find, and most of it is fixable with a short delay.
Who genuinely needs more work-up
Anyone with a recent heart attack or stroke, uncontrolled heart failure, severe lung disease, or a chest infection. Also anyone on blood thinners, which need a plan agreed in advance rather than stopped on the morning.
Take every medicine you use to the assessment, in its own packet, including anything herbal or ayurvedic.Before the day
What the pre-operative assessment involves
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A questionnaire and examination
Your medical history, previous operations, allergies, and any trouble with a past anaesthetic. Mention family problems with anaesthetics too, because a few reactions run in families.
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Blood tests
Full blood count, kidney function, blood sugar and clotting. Grouping and saving a sample in case blood is needed, though it rarely is for breast surgery.
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A heart tracing, and sometimes more
An ECG is routine over a certain age or with any heart history. An echocardiogram is added where there is a reason, particularly if you have had HER2 treatment or anthracycline chemotherapy.
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Meeting the anaesthetist
They examine your neck movement, mouth opening and teeth, and explain the plan. Ask about sickness afterwards if you have had it before, because it can usually be prevented.
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Written instructions
When to stop eating, which medicines to take on the morning and which to hold. Get this in writing. It is the single most common thing people misremember.
Medicines
What to tell them about, without being asked
These are the ones that most often cause a problem when they are not declared.
Blood thinners
Aspirin, clopidogrel, warfarin and the newer tablets all need a plan. Never stop them yourself. Stopping the wrong one without advice carries its own risk.
Diabetes medicines and insulin
Doses usually change on the morning of surgery because you are fasting. Certain tablets are held for a day or two beforehand. You will be given a specific plan.
Ask to be placed early on the list if you are diabetic.Herbal and ayurvedic preparations
Several affect bleeding or interact with anaesthetic drugs. People routinely do not mention them because they do not count them as medicine. List them anyway.
Hormone tablets and treatment already started
Tell them what cancer treatment you are on or have had. Previous anthracycline chemotherapy or HER2 treatment matters for the heart assessment.
Also mention
- Inhalers and steroids
- Anything for thyroid or epilepsy
- Weight-loss or diabetes injections
Not sure whether this applies to you?
Ask an oncologistWords you will hear
The vocabulary, in plain language
- General anaesthetic
- You are fully asleep and feel nothing. The usual choice for breast cancer surgery.
- Regional block
- An injection that numbs the chest wall nerves, given alongside the general anaesthetic. It reduces pain afterwards and the amount of strong painkiller you need.
- Fasting, or nil by mouth
- Stopping food and drink beforehand so the stomach is empty. Clear fluids are usually allowed later than food.
- ASA grade
- A simple score the anaesthetist uses to describe your overall fitness. A higher number means more planning, not that surgery is refused.
- Recovery, or PACU
- The monitored area where you wake up, with a nurse beside you, before returning to the ward.
- Day-care
- Admitted and discharged the same day. Common for a lumpectomy without a drain.
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Side by side
What is common, and what is rare
Common, and settles
Rare
Feeling sick for a few hours
A serious allergic reaction to a drug
Sore throat from the breathing tube
Damage to teeth or crowns
Shivering and feeling cold on waking
A chest infection afterwards
Grogginess and poor memory of the first hour
Confusion lasting days, mainly in older patients
Bruising where the cannula went in
Waking during the operation
Being straight with you
What the risks honestly are
Serious complications from anaesthesia in a reasonably fit person having breast surgery are uncommon. The consent form lists rare events because it must, not because they are likely. Ask your anaesthetist to put your own risk in context rather than reading the list alone.
Age is not the deciding factor
Fitness matters far more than the number. Plenty of women in their eighties have breast surgery safely, while a much younger person with poorly controlled heart disease needs more preparation. Do not let a relative talk you out of surgery on age alone.
Confusion afterwards is worth knowing about
Older patients sometimes become confused for a few days after an anaesthetic. It usually settles. Having a familiar person present, glasses and hearing aids available, and a normal sleep routine all genuinely reduce it.
What this page cannot tell you
It cannot tell you your own risk, because that depends on your heart, your lungs, your medicines and the operation planned. Ask the anaesthetist directly: given my health, what are you most concerned about, and what can I do before the day to improve it.
Commonly believed
What families worry about before an anaesthetic
She is too old for an anaesthetic.
Fitness matters far more than age, and breast surgery is short and does not enter the chest or abdomen. Women in their eighties have it safely every week. Refusing surgery on age alone usually costs more than it saves.
Anaesthesia makes cancer spread.
There is no good evidence for this, and it is a belief that leads people to refuse an operation that would have removed their cancer. If you have read something that worries you, bring it to your oncologist rather than acting on it.
Stopping her blood thinner a few days early is sensible.
Never do this without advice. Some are stopped, some are continued, and some are swapped for an injection. Stopping the wrong one carries a real risk of a clot or a stroke. Let the team make the plan.
Ayurvedic medicines do not need to be mentioned.
Several affect bleeding or interact with anaesthetic drugs, and they are the most commonly undeclared thing in the assessment. Nobody will criticise you for taking them. Bring the packets so the team can check.
Questions we are asked
Common questions about the anaesthetic
Will I feel anything during the operation?
No. Under a general anaesthetic you are fully unconscious and monitored continuously. Awareness during surgery is very rare. If it is a specific fear of yours, say so to the anaesthetist, because they can explain exactly how depth is monitored and it usually helps a great deal.
How long until I am properly awake?
You will be rousable within minutes but groggy for an hour or two, and most people remember little of that time. Full clear-headedness usually returns the same evening. Do not sign anything, drive or make decisions for the rest of that day.
Can I have a nerve block instead?
A block is usually given alongside the general anaesthetic rather than instead of it. It numbs the chest wall nerves and substantially reduces pain afterwards, which means less strong painkiller and less sickness. Ask whether one is planned for you.
I was very sick after a past anaesthetic. Can that be avoided?
Usually yes, and this is well worth raising. Knowing you are prone to it lets the anaesthetist choose different drugs and give preventive medicine before you wake. Tell them at the assessment, not on the morning.
When do I stop eating and drinking?
Typically no food from midnight, with clear fluids allowed until a stated time closer to surgery. The exact hours vary between hospitals, so follow the written instructions you are given rather than what a relative remembers from their own operation.
Should I stop smoking before surgery?
Yes, and the earlier the better. Smoking raises the risk of chest problems after an anaesthetic and meaningfully slows wound healing, which matters a great deal if you are having reconstruction. Even a few weeks without helps.
What if I get a cold before the date?
Ring the ward rather than turning up. A minor cold is often fine; a chest infection with fever usually means a short postponement, because operating through one raises the risk of complications. Reporting it early keeps the delay short.
Will they need to give me blood?
Very rarely for breast surgery, which is not a heavy-bleeding operation. A sample is usually grouped and saved as a precaution. If you have beliefs about transfusion, say so at the assessment so it is recorded and planned around.
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Talk to our team
Speak to a breast cancer specialist
Call the helpline or leave your details, and someone will help you arrange a consultation at the CION centre nearest you. One helpline serves every CION centre.
Call 1800 202 8726
Helpline open 24/7
Sources
- Cancer Research UK — Having an anaesthetic
- National Cancer Institute — Surgery to treat cancer
- Royal College of Anaesthetists — Information for patients
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.