Medical Oncologist
CION Cancer Clinics
Fever after cancer surgery | CION Cancer Clinics
A mild temperature in the first day or two after surgery is common and often the body's normal reaction to the operation. A fever that starts later, keeps rising, comes with shivering or appears after you go home needs checking the same day, because it can be an early sign of infection. This page explains what the timing suggests, what to do at home, and what the team does. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
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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
- When should a fever after surgery worry you?
- What does the timing of a fever usually point to?
- What can cause a fever after cancer surgery?
- How should you check a temperature at home?
- What do families often get wrong about fever after surgery?
- What happens when you come back with a fever?
- Common questions about fever after cancer surgery
The short answer
When should a fever after surgery worry you?
A mild temperature in the first day or two after an operation is common and is often the body's normal reaction to surgery. A fever that starts later, keeps rising, comes with shivering, or appears after you have gone home needs to be checked the same day, because it can be the first sign of an infection.
Why surgery causes a temperature
Cutting and handling tissue sets off inflammation, the body's repair response. That response can raise your temperature a little even when there is no infection at all. It usually settles as you start moving, breathing deeply and eating again.
Why a later fever is different
When a fever appears several days after the operation, the team thinks first about infection: in the chest, the urine, a drip line, the wound, or inside the abdomen. After bowel, stomach or food pipe surgery, a leak from the join is one of the causes they need to rule out.
If you have also had chemotherapy
Chemotherapy before or after surgery can lower the white cells that fight infection. A fever then is more urgent, because infection can spread quickly. Tell every doctor you see that you have had chemotherapy and when.
The timing matters
What does the timing of a fever usually point to?
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The first day or two
Often the body's response to the operation. Shallow breathing because of pain can add to it. Deep breathing, sitting up and walking help. The team still checks you, but usually no infection is found.
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A few days after surgery
Chest infections and urine infections become more likely, especially if you have had a catheter. A drip line in the arm or neck can also become infected, so the site is checked.
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Around the end of the first week
Wound infections, a collection of fluid or pus inside, and leaks from a join often show at this stage. A fever may come with worsening pain, a fast heartbeat or not tolerating food.
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After you have gone home
A wound infection is the commonest cause, but a deeper infection or a blood clot can also cause a temperature. Any new fever at home needs a same-day call to the team.
Not sure whether this applies to you?
Ask an oncologistPossible causes
What can cause a fever after cancer surgery?
The team works through these one by one. Knowing them helps you tell the doctor what you have noticed.
Chest infection
Cough, coloured phlegm, breathlessness or pain on breathing in. More likely after chest or upper abdominal surgery and in smokers.
Wound infection
Spreading redness, heat, swelling, pus or a wound that opens. Usually treated with dressings and sometimes antibiotics.
Urine infection
Burning, needing to pass urine often, cloudy or smelly urine. More common after a catheter.
Infection inside
A collection of pus near the operation site or a leak from a join. Often comes with pain that is getting worse and a feeling of being very unwell.
Usually needs a scan to find.A drip line
Redness or pain where a cannula or central line enters the skin. The line is usually removed.
A blood clot
A clot in the leg or lung can cause a low fever, with a swollen calf, chest pain or breathlessness.
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When a fever cannot wait
Go to the nearest emergency department the same day if a fever starts after you have gone home from surgery, or if any fever comes with uncontrolled shivering, fast breathing, confusion, very little urine, cold blotchy skin or feeling faint. These can be signs of sepsis. If you have had chemotherapy, say so at the desk. Do not wait until the morning to see whether it settles.
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At home
How should you check a temperature at home?
Use a digital thermometer
Keep one at home before discharge. Place it under the tongue with the mouth closed, or in the armpit, and wait for the beep. Do not measure straight after a hot drink or a bath.
Check at the same times
Morning and evening is enough if the person feels well. Check again any time they feel hot, cold, shivery or unwell.
Write it down
Note the reading, the time, and any other signs: cough, wound changes, pain, urine, appetite. Note when any paracetamol was last taken, because it lowers the reading.
Call with the numbers ready
When you call the team, give the readings, the operation, the date of surgery and the other signs you noticed. It speeds up the decision.
Commonly believed
What do families often get wrong about fever after surgery?
"Every fever after an operation is normal."
A mild temperature in the first day or two often is. A fever that starts later, or once you are home, is not something to assume away. It needs to be checked the same day.
"Paracetamol brought it down, so the problem is gone."
Paracetamol lowers the temperature but does not treat the cause. An infection can keep growing while the thermometer looks normal. Tell the team about the fever even if it came down.
"We have some antibiotics left over, so we will start those."
The wrong antibiotic can hide an infection without treating it, and makes it harder for the team to find the cause. Do not start any medicine on your own. Call first.
"No fever means no infection."
Older people, and people on steroids or after chemotherapy, may not run a fever at all. Confusion, weakness, fast breathing or not eating can be the only signs.
Coming back in
What happens when you come back with a fever?
The team first checks how unwell you are: temperature, pulse, blood pressure, breathing and oxygen. If there are signs of sepsis, antibiotics are started quickly, often before every test result is back.
Finding the cause
Expect blood tests, a urine test and often a chest X-ray. The wound and any lines or drains are examined. If an infection inside the abdomen or a leak is possible, a CT scan is usually arranged. Samples may be sent to grow any germs, so the antibiotic can be matched to them.
Treatment depends on what is found
Many fevers settle with antibiotics, fluids and chest physiotherapy. A collection of pus may be drained with a thin tube placed under scan guidance. A small number of problems need a second operation.
What this page cannot tell you
This page cannot tell you what is causing your own fever. Only an examination and tests can. It is a guide to when to act, not a way of deciding at home that it is nothing.
Questions we are asked
Common questions about fever after cancer surgery
Is a low-grade fever after surgery normal?
In the first day or two after surgery, a mild rise in temperature is common and is often the body's reaction to the operation. The team still checks you. A low fever that lasts, keeps rising, starts later or appears after discharge is not assumed to be normal and needs to be looked at the same day.
What temperature counts as a fever?
Your discharge sheet should give the reading the team wants you to act on, and a digital thermometer will show it clearly. After surgery, the number is only part of the picture. Shivering, feeling very unwell, fast breathing or confusion matter even when the reading is lower. If you are worried, call the team rather than waiting for a particular number.
Can we give paracetamol for a fever at home?
Call the team before giving anything new. Paracetamol may already be part of your pain medicines, and it can hide a rising fever. Tell the team when the last dose was taken. Follow the medicine plan on your discharge sheet, and do not add or change medicines on your own.
The wound looks fine. Where else could the fever come from?
The chest, the urine, a drip line, a collection of fluid inside the abdomen, a leak from a join, or a blood clot can all cause a fever with a normal-looking wound. That is why the team usually needs blood tests and sometimes a scan, even when the wound seems to be healing well.
We live far from the hospital. Where should we go?
If the person is very unwell, go to the nearest emergency department and bring the discharge summary. They can start treatment and speak to the operating team. If the person is well otherwise, call the operating team first and follow their advice about where to be seen.
Does a fever mean the cancer has come back?
A fever in the weeks after surgery is almost always about healing or infection, not the cancer itself. It is a common worry, and it is worth saying out loud to the team. They will explain what they think is causing it once the tests are back.
Will we have to stay in hospital again?
Sometimes. A mild wound or urine infection may be treated with tablets at home. A chest infection, a collection or signs of sepsis usually need admission for drip antibiotics and closer watching. The team decides after examining you and seeing the first results.
How can we lower the chance of a fever after surgery?
Deep breathing and coughing exercises, getting out of bed early, keeping the wound clean and dry, washing hands before touching dressings, and drinking enough all help. Stopping smoking before surgery lowers the chance of a chest infection. None of these remove the risk completely.
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Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
Surgical Oncologist
Surgical Oncologist
Dr. Vinay Mamidala
MBBS, MS(General Surgery), M.Ch(Surgical Oncology), FMAS, FARIS(Ongoing)
Surgical Oncologist
Radiation Oncologist
Radiation Oncologist
Radiation Oncologist
Hematologist
Surgical Oncologist
Dr. Vajja Sandeep Kumar
MBBS, MS (General Surgery), DrNB (Surgical Oncology), FALS Oncology
Surgical Oncologist
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Sources
- NHS — High temperature (fever) in adults
- NHS — Sepsis
- NICE — Surgical site infections: prevention and treatment (NG125)
- American Cancer Society — Cancer 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
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Red Flags After Discharge: When to Come Back TodayEvery sign that means returning the same daySepsis After Cancer SurgeryWhen an infection starts to affect the whole bodyChest Infection After Cancer SurgeryThe commonest cause of fever a few days after surgeryWound, Stitches and ScarsLooking after the wound to lower infection risk
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