Medical Oncologist
CION Cancer Clinics
How safe is anaesthesia for cancer surgery? | CION Cancer Clinics
Serious harm caused by the anaesthetic itself is rare. UK figures put death caused by anaesthesia at about 1 in 100,000 general anaesthetics, but that is an average, and it leaves out the risks of the operation and your illness. This page sets out the sourced figures, what raises the risk for some people, how your own risk is checked, and what you can do beforehand. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
MI
Medically reviewed by Dr. Mohammed ImaduddinConsultant Surgical Oncologist · MBBS, MS (General Surgery), MCh (Surgical Oncology) · last reviewed September 2026, next review due September 2027
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On this page
- Is anaesthesia safe?
- How often do the main risks of anaesthesia happen?
- What makes the risk higher for some people?
- How is your own risk checked?
- Can you lower your risk before the operation?
- What do families believe about the dangers of anaesthesia?
- What can these numbers not tell you?
- Common questions about the safety of anaesthesia
The short answer
Is anaesthesia safe?
Serious harm caused by the anaesthetic itself is rare. UK figures from the Royal College of Anaesthetists put death caused by anaesthesia at about 1 in 100,000 general anaesthetics. That figure is about the anaesthetic alone, not the operation or the illness behind it.
The anaesthetic and the operation carry different risks
Major cancer surgery has its own risks: bleeding, infection, blood clots, and strain on the heart and lungs. For a large operation, these usually matter more than the anaesthetic. Your surgeon explains the risks of the operation. Your anaesthetist explains the risks of the anaesthetic. Ask both questions, because the answers are different.
Your health changes the picture
A fit adult with no heart or lung problems and a person with heart failure do not face the same risk from the same anaesthetic. Your anaesthetist looks at your health, your tests and the operation together before telling you what the risks mean for you.
The figures on this page are UK averages. They are not your personal risk, and they are not figures from any hospital in India.The numbers
How often do the main risks of anaesthesia happen?
What can happen
How often, from UK figures
Feeling sick, sore throat, shivering or drowsiness
Common, and usually short-lived and treatable
Confusion for some days in older people
Common in older people, and usually settles
A serious allergic reaction
About 1 in 10,000 anaesthetics
Waking during general anaesthesia
About 1 in 20,000 general anaesthetics
Death caused by the anaesthetic
About 1 in 100,000 general anaesthetics
Not sure whether this applies to you?
Ask an oncologistWhat your anaesthetist looks for
What makes the risk higher for some people?
These do not mean anaesthesia is out of the question. They mean the plan needs more care.
Heart and lung disease
A past heart attack, heart failure, severe lung disease, or getting breathless on a flight of stairs all put more strain on the body under anaesthesia.
Sleep apnoea and heavy weight
Breathing that stops during sleep, and a heavy build, can make the breathing tube harder to place and breathing afterwards harder to manage.
Frailty, more than age
Age alone does not decide the risk. How active and independent a person is tells the anaesthetist much more.
Other conditions
Some long-term illnesses and habits add to the risk.
For example
- Diabetes that is poorly controlled
- Kidney disease
- Smoking
The size of the operation
Long, major operations and emergencies carry more risk than short, planned ones, with less time to prepare the body.
Before surgery
How is your own risk checked?
Questions about daily life
How far you can walk, whether stairs leave you breathless, whether you snore. These simple answers tell the anaesthetist a lot about your heart and lungs.
Tests
Blood tests and a heart tracing are common. Some people also need a heart ultrasound, a breathing test or an exercise test.
A health grade
The anaesthetist gives an ASA grade, a score for your general health. People with more complex health may be discussed with other doctors, and an ICU bed may be planned.
Talking it through
The main risks are explained to you before you sign consent. Ask what they mean for you, not for people in general. Bring the family member who will help you decide.
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What you can do
Can you lower your risk before the operation?
Yes, often. The weeks before a planned operation are a chance to get your body ready, and small changes help.
Stop smoking as early as you can
Stopping at any point before surgery helps your lungs and your wound. Ask your doctor about support to stop.
Keep moving and eating
Walking every day, as far as you comfortably can, builds strength for recovery. Eating well matters too, especially if you have lost weight. This preparation is sometimes called prehabilitation.
Keep sugar and blood pressure in check
If you have diabetes or high blood pressure, see the doctor who treats it before surgery. Well-controlled sugar helps wounds heal and lowers the chance of infection. Any change to your medicines should come from that doctor.
Bring your medicines and speak up
Bring every medicine in its packet. Do not stop or change any on your own. Tell the team about allergies, snoring, loose teeth and any past reaction to anaesthesia.
When the plan changes
Sometimes the team decides the risk is too high to go ahead as planned, or suggests waiting to improve your health first. That decision belongs to your treating team. Ask them to explain their reasons.
Commonly believed
What do families believe about the dangers of anaesthesia?
"The anaesthetic is the most dangerous part."
For major cancer surgery, the operation and the illness usually carry more risk than the anaesthetic. Both are worth asking about.
"Elderly people should never be put to sleep."
Age alone does not rule anyone out. Fitness, other illnesses and the size of the operation matter more. Older people do need extra care for confusion afterwards.
"A relative had a bad reaction, so I will too."
Not necessarily. But a few rare reactions do run in families. Tell your anaesthetist about any relative who had a serious problem, so certain medicines can be avoided.
"Asking about risks will upset the doctors."
Asking about risk is expected, and it is part of giving consent. A clear answer is your right before any operation.
Being straight with you
What can these numbers not tell you?
They cannot tell you your own risk. They are averages across many people in the UK, most of them having routine operations.
They leave out the operation
None of the figures above include the risks of the surgery itself. Ask your surgeon about those separately.
They are not a promise either way
A small number does not mean nothing can go wrong for you. A larger risk does not mean something will. The figures help you and your team talk about risk honestly. They do not decide the outcome, and they do not replace a conversation about your own health.
Questions worth asking
What are the main risks of the anaesthetic for me? Is there anything about my health that makes you more cautious? Will I need the ICU afterwards? What would make you delay the operation? A good team welcomes these questions.
Questions we are asked
Common questions about the safety of anaesthesia
What is the risk of dying from anaesthesia?
UK figures from the Royal College of Anaesthetists put death caused by the anaesthetic at about 1 in 100,000 general anaesthetics. That is an average, and it does not include the risk of the operation or of your illness. Your anaesthetist can explain what applies to you.
Is anaesthesia riskier for someone with cancer?
It can need more planning. Recent chemotherapy can lower blood counts or affect the heart. Radiotherapy to the neck can make a breathing tube harder to place. Weight loss and weakness also matter. Tell your anaesthetist about every cancer treatment you have had, with dates.
Is a spinal safer than general anaesthesia?
Not for everyone. For some people, especially with lung disease, a spinal puts less strain on the body. For others, bleeding risks or the operation itself make general anaesthesia the safer choice. Ask your anaesthetist why they suggest one over the other for you.
My father is elderly. Is anaesthesia too risky for him?
Age alone does not answer that. His fitness, heart, lungs, memory and the size of the operation matter more. Older people are more likely to be confused for some days afterwards. Ask the team how they will check his risk and what care he will need.
Can anaesthesia cause lasting memory loss?
Short-term confusion is common in older people after major surgery, and usually settles. Whether it causes lasting memory problems is still being studied, and the evidence is not settled. Tell the team about any memory problems before surgery, so they can plan care.
What is malignant hyperthermia?
It is a rare, inherited reaction to some anaesthetic gases and one muscle relaxant, causing a dangerous rise in body temperature. It is not related to cancer. If any relative had a serious reaction under anaesthesia, tell your anaesthetist, who can avoid the medicines that trigger it.
Does chemotherapy before surgery affect the anaesthetic?
It can. Some chemotherapy medicines affect the heart or lungs, and most lower blood counts for a while. The team times surgery around this and may order extra tests. Bring a list of the medicines you received and when you had them.
Who explains the risks to us before we sign consent?
The surgeon explains the risks of the operation. The anaesthetist explains the risks of the anaesthetic, usually at the check before surgery or on the day. Family members can join. Ask for any word you do not understand to be explained again, in the language you are most comfortable in.
Meet the Specialists
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Dr. C. Raghavendra Reddy
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Dr. Vinay Mamidala
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Sources
- Royal College of Anaesthetists — Information for patients and carers
- NHS — General anaesthesia
- American Cancer Society — Cancer surgery
- Macmillan Cancer Support — 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.
Keep reading
Related pages
Will I Wake Up During the Operation?More on awareness and how it is preventedAnaesthesia in Elderly PatientsWhat changes when the patient is olderFitness, Tests and PrehabilitationHow to prepare your body before surgeryComplications and Red FlagsThe risks of the operation itselfMeeting Your Anaesthetist: What to AskQuestions to ask about your own risk
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