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Post-ablation syndrome: the flu-like days after treatment | CION Cancer Clinics
Post-ablation syndrome is a short, flu-like illness many people get in the days after a tumour is ablated: a low fever, aches, tiredness, feeling sick and a poor appetite. It is the body reacting to the destroyed tumour, and it usually settles on its own within about a week. This page explains what it feels like, how to manage it at home, and when a fever needs checking the same day. 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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The short answer
What is post-ablation syndrome?
Post-ablation syndrome is a short, flu-like illness that many people get in the days after a tumour is ablated. It usually means a low fever, body aches, tiredness, feeling sick and a poor appetite, and it settles on its own within about a week.
Why it happens
Ablation leaves the destroyed tumour inside the body. Your immune system reacts to that dead tissue as it starts to clear it away, releasing chemical messengers that cause fever and aches. It is the body responding to the treatment, not a sign that the procedure has gone wrong.
Who is more likely to get it
It tends to be stronger when a larger tumour or a bigger area is treated, or when several tumours are treated at once. It is described most often after liver and kidney ablation, and after embolisation, a related treatment that blocks a tumour's blood supply.
What this page cannot tell you
It cannot tell you whether the fever you have now is this syndrome or an infection. Only an examination, and sometimes blood tests or a scan, can separate the two. When in doubt, call your team.
!
When a fever is not just post-ablation syndrome
Call your team or go to the nearest emergency department the same day if the fever keeps rising or comes with shivering and shaking, if the person becomes confused or very drowsy, if belly pain is severe or getting worse, if the eyes or skin turn yellow, if there is breathlessness, or if a fever starts after they had begun to feel better. These can be signs of infection or an abscess, a pocket of pus, in the treated area. Do not keep giving fever medicines at home to hide it.
Not sure whether this applies to you?
Ask an oncologistWhat to expect
What does post-ablation syndrome feel like?
Most people have some of these, not all. They usually come on together within the first few days.
Fever
Usually a low, grumbling fever rather than a very high one. It may come and go, and is often worse in the evening. Sweats at night are common.
Keep a note of
- Temperature readings and times
- When fever medicines were taken
- Anything new, such as shivering
Aches and tiredness
Muscle aches, a heavy tired feeling and wanting to sleep more than usual. Many people describe it as being like a bad bout of flu.
Feeling sick and not eating
Nausea, a poor appetite and sometimes vomiting. Small, simple meals and regular sips of fluid are easier than full meals.
Pain at the treated area
A dull ache over the organ that was treated, which can be worse on deep breathing. After liver ablation it can also be felt at the tip of the right shoulder.
The usual course
How long does it usually last?
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The first day or two
Symptoms often start once the anaesthetic has worn off, either on the first night in hospital or soon after you get home. A low fever at this stage is common and expected.
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The next few days
This is usually when it feels worst. Rest, fluids and the prescribed medicines are the main treatment. Most people stay at home and do not need to come back into hospital.
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Around the end of the first week
For most people, the fever and aches fade and appetite returns. Tiredness can linger a little longer, and that is still part of normal recovery.
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Beyond that
Symptoms that have not eased after about a week, or that are getting worse instead of better, should be reported. The team may want to check your blood or arrange a scan to look for another cause.
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Telling them apart
How is it different from an infection?
A guide to help you decide when to call. It cannot rule out infection at home.
More like post-ablation syndrome
Needs checking for infection
A low fever starting in the first few days
A fever that keeps climbing, or starts after you had improved
Gradually easing, day by day
Getting worse rather than better
Aches and tiredness, like flu
Shivering, shaking, or feeling confused
A steady ache at the treated spot
Pain that is severe, spreading or new
Eating a little and drinking enough
Unable to keep fluids down
Commonly believed
What do people misunderstand about this reaction?
"The fever means the treatment failed."
The fever is a reaction to destroyed tissue, not a measure of whether all the tumour was treated. Some people with a strong reaction have a successful ablation, and so do some with no reaction. The follow-up scan answers whether it worked.
"Antibiotics should be started straight away, just in case."
Post-ablation syndrome is not an infection, and antibiotics do not treat it. Whether you need them is a decision for your team after they check you. Never start or change a medicine on your own.
"If it is expected, there is no need to tell anyone."
Tell your team anyway. They want to know how you are, and a short conversation is how warning signs get caught early.
"Once it settles, recovery is over."
Tiredness can linger for a while longer, and you still need the follow-up scan. Feeling better is good news, but it is not the same as a result.
Looking after yourself
How can you manage it at home?
Most people manage post-ablation syndrome at home with the medicines prescribed at discharge and some patience. The person caring for them matters here, because the patient may be too tired to notice changes.
Rest and fluids
Rest as much as you need, but get up and walk a little several times a day. Drink regularly, because fever and poor eating both dry you out. Coconut water, buttermilk and thin soups are often easier than heavy meals.
Fever and pain medicines
Paracetamol, sold as Dolo or Crocin, is commonly used for fever and aches. Take only what your team prescribed, at the times written down. Check before using any other medicine at home, including anti-inflammatory painkillers.
Keep a simple record
Write down temperature readings, the times medicines were taken, how much was eaten and drunk, and anything new. If you do need to call, this record makes the conversation quick and useful.
If you live far from the hospital, ask before discharge which hospital near home to go to if a warning sign appears at night.Questions we are asked
Common questions about post-ablation syndrome
Is fever after ablation normal?
A low fever in the first few days is common and is usually part of post-ablation syndrome. It should gradually ease. A fever that keeps rising, comes with shivering, or starts after you had begun to feel better is different, and needs your team or an emergency department the same day.
How is post-ablation syndrome treated?
Mostly with rest, fluids and simple medicines for fever, pain and sickness, as prescribed by your team. It does not need antibiotics, because it is not an infection. Most people stay at home. Occasionally someone who cannot drink enough is brought back in for fluids through a drip.
Can post-ablation syndrome be prevented?
Not reliably. Some teams give medicines around the procedure to reduce it, and some people simply have a milder reaction. It is linked to how much tissue was treated, so it cannot always be avoided when a larger tumour needs treating. Ask your team what they plan to use.
Do I need blood tests if I have a fever?
Your team decides that. If the fever is mild and settling, often nothing more is needed. If it is high, lasting longer than expected, or comes with other warning signs, blood tests and sometimes a scan help check for infection or another problem.
How do I know it is not an abscess?
You cannot be sure at home. An abscess is a pocket of infection in the treated area. It tends to cause a fever that climbs or returns later, with shivering and worsening pain. If you notice that pattern, call your team the same day rather than waiting for your appointment.
Can I travel back to my district while I have symptoms?
A long journey while feverish and tired can be hard. If you live far away, ask whether it is sensible to stay near the hospital for a few days. If you do travel, find out beforehand which hospital near home you would go to if a warning sign appeared.
Does it happen after every kind of ablation?
It can follow radiofrequency, microwave and freezing ablation, and is also common after embolisation. How often and how strongly it happens varies with the organ, the technique and the size of the area treated. Your team can tell you how likely it is after your particular procedure.
Will I feel like this again after a repeat ablation?
Possibly. A second treatment can bring on a similar reaction, especially if a similar or larger area is treated. Knowing what to expect usually makes it easier to manage the second time. Tell the team how the first episode went, so they can plan medicines to suit.
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Sources
- American Cancer Society — Tumor ablation for liver cancer
- NHS — Sepsis
- NHS — Liver cancer: treatment
- National Cancer Institute — Liver and bile duct cancer
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
Pain and recovery after ablationWhat else is normal in the days afterWhat happens on the day of ablationThe procedure itself, step by stepComplications and red flagsWarning signs after any cancer procedureScans after ablation: reading the reportHow you find out whether it workedAblation: RFA, microwave, cryo and IREEvery page in this guide
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Unsure whether a fever after ablation is normal?
Tell us what was done and how you are feeling, and we will help you reach the right specialist. For a warning sign, go to the nearest emergency department first. One helpline serves every CION centre.