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What going under general anaesthesia really feels like | CION Cancer Clinics
General anaesthesia usually feels like nothing at all. You may notice a cool feeling in your arm or the smell of a mask, your eyelids grow heavy, and the next thing you know you are waking in the recovery room. This page walks through each moment, what you might feel as you wake, and what helps if you are frightened. 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
- What does general anaesthesia actually feel like?
- What happens, moment by moment, as you go to sleep?
- What might you feel when you wake up?
- What do the words you hear mean?
- What do people fear about going under, and what is true?
- Who finds going to sleep harder, and what helps?
- What can make the day easier?
- Common questions about going under
The short answer
What does general anaesthesia actually feel like?
For most people it feels like nothing at all. You notice a cool feeling in your arm or the smell of a mask, your eyelids grow heavy, and the next thing you know a nurse is calling your name in the recovery room.
It is not the same as sleep
In ordinary sleep you turn over, dream and wake knowing the night has passed. General anaesthesia is different. Medicines hold your brain in a controlled state where you feel nothing and form no memories. An operation that lasts hours can feel like the blink of an eye. Some people find that strange when they wake. It is normal.
The fear is usually worse than the moment
Most of the worry comes in the hours of waiting, not in the operating theatre. Going to sleep itself is quick and calm for most people. If you are very anxious, say so. The team can explain each step as it happens, and some people are given a calming medicine beforehand.
This page describes common experiences. Your own may differ, and your anaesthetist can tell you what to expect for your operation.On the day
What happens, moment by moment, as you go to sleep?
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The waiting area
You change into a gown and wear a name band. Several people will ask your name, your operation and your allergies. The repeated questions are safety checks, not a sign that anyone is confused.
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Into the operating theatre
The room is cool and brightly lit. Sticky pads go on your chest to watch your heart, a cuff on your arm checks blood pressure, and a clip on your finger reads your oxygen level.
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The drip
A thin plastic tube, called a cannula, goes into a vein in the back of your hand or arm. It feels like a sharp scratch, much like a blood test.
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Breathing oxygen
A soft mask is held gently over your nose and mouth. It may smell of plastic. You simply breathe normally.
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Going to sleep
The medicine goes in through the drip. Some people feel it cold or stinging up the arm, or feel light-headed. Within moments you are asleep.
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Waking up
You wake in the recovery room with a nurse beside you. Any breathing tube has already been taken out. You will feel drowsy and may drift in and out for a while.
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Ask an oncologistIn the recovery room
What might you feel when you wake up?
Most of these feelings are common and pass within hours. Tell the nurse about any of them. Each one can be eased.
Sleepy and muddled
You may not know where you are for a few minutes, or forget what you were told. Older people can stay confused for longer.
A sore throat
A breathing tube can leave your throat scratchy and your voice hoarse. Sips of water, once allowed, usually help.
Feeling sick
Some people feel sick or vomit. Anti-sickness medicine works well, and it can be given before you even ask.
Cold and shivering
Operating theatres are cool and the body loses heat while asleep. Warm blankets or a warm air cover are used.
Pain at the wound
You will be asked to score your pain. Give an honest number. Pain treated early is easier to control.
In the theatre
What do the words you hear mean?
- Cannula
- The thin plastic tube in your vein that medicines and fluids go through.
- Induction
- The moment the anaesthetist gives the medicine that puts you to sleep.
- Breathing tube
- A soft tube placed in your windpipe after you are asleep, so a machine can help you breathe.
- Laryngeal mask
- A softer device that sits in the back of the throat. It is used for shorter operations instead of a full breathing tube.
- Premedication
- A medicine given before you go to the theatre, often to calm you or ease sickness.
- Recovery room
- The area next to the theatre where nurses watch you closely while you wake up.
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Commonly believed
What do people fear about going under, and what is true?
"I will say embarrassing things as I go to sleep."
Some people feel chatty as they drift off or wake up. The team hears this every day and pays it no attention. Most people say nothing unusual at all.
"It is just a very deep sleep."
It is a controlled state kept steady by medicine, and a doctor watches your heart, breathing and oxygen every moment of it. That constant watching is what makes it different from sleep.
"I will feel the operation but be unable to move."
This is called accidental awareness and it is very rare. The team takes steps to prevent it. If it worries you, ask your anaesthetist what they do to watch for it.
"I should hide how scared I am."
Say it plainly. Fear is expected before surgery. Knowing about it lets the team slow down, explain each step and offer a calming medicine if it suits you.
When it is harder
Who finds going to sleep harder, and what helps?
Some people find the experience more difficult than others. Most of the problems have simple answers, but only if the team knows about them in advance.
If a mask frightens you
People who feel closed in by a mask can often go to sleep through the drip first. The mask is placed only once they are asleep. Ask about this at your check before surgery.
If a parent is elderly, hard of hearing or has memory problems
Ask whether hearing aids and glasses can stay on until the last moment. Tell the team about any memory problems. In some centres a family member can stay close until the theatre doors. Rules differ, so ask.
If a past anaesthetic went badly
Severe sickness, a very slow wake-up or a reaction to a medicine last time all matter. Mention them even if they seem minor.
What this page cannot tell you
It cannot tell you which medicines you will receive or how you in particular will feel. Those depend on your health and your operation.
Small things that help
What can make the day easier?
- Follow the eating and drinking instructions you are given exactly
- Remove jewellery, nail polish and make-up before you arrive
- Bring a written list of your medicines and allergies
- Tell the team about loose teeth, dentures or caps
- Say if you are frightened, before you reach the theatre
- Ask a family member to wait nearby for when you wake
Questions we are asked
Common questions about going under
Will I dream while I am under?
Most people remember no dreams at all. A few describe dreams as they wake, often pleasant ones, which fade quickly. Dreaming is not a sign that you were awake during the operation. If a dream or memory troubles you afterwards, tell your anaesthetist, who can talk it through with you.
How quickly will I fall asleep?
When the medicine goes through the drip, most people are asleep within moments. You may be asked to count or to breathe deeply, and many people do not get far. Going to sleep by breathing a gas through a mask takes a little longer, and is used more for children.
Does the medicine hurt when it goes in?
The cannula feels like a sharp scratch. Some sleep medicines sting or feel cold as they travel up the arm, for a few seconds before you drift off. Tell the anaesthetist if it is uncomfortable. They can often slow it down or give something to ease it first.
Will I know how long I was asleep?
No. Time does not seem to pass under general anaesthesia. Many people are surprised to learn their operation took hours, because it felt like a moment. Your family will usually know better than you, since they were the ones waiting.
Can my family be with me as I go to sleep?
For adults, family usually say goodbye in the waiting area rather than in the theatre, because the theatre must stay clean. Rules differ between hospitals and for older or confused patients. Ask the team beforehand so you know what to expect and can plan who waits nearby.
Why do I feel so tired for days afterwards?
The medicines leave your body fairly quickly, but the operation itself, poor sleep in hospital, pain and not eating well all take energy. Tiredness after major cancer surgery is common and can last some weeks. If it is getting worse rather than better, tell your team.
I was very sick after my last anaesthetic. Will it happen again?
Not necessarily. Tell your anaesthetist, because a past history of sickness changes the plan. They can choose different medicines and give anti-sickness medicine before you wake. Motion sickness and being a non-smoker can also make sickness more likely, so mention those too.
When can I eat and drink after waking?
It depends on the operation. After smaller operations people often have sips of water soon after waking. After surgery on the stomach, bowel or throat, eating is started slowly and on the surgeon's advice. Do not eat or drink until a nurse tells you it is safe.
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Sources
- NHS — General anaesthesia
- Cancer Research UK — Surgery for cancer
- 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.
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