Medical Oncologist
CION Cancer Clinics
Chest infection after cancer surgery | CION Cancer Clinics
A chest infection after surgery, or post-operative pneumonia, happens because pain, anaesthesia and time in bed make you breathe shallowly and cough less, so phlegm collects in the lungs and becomes infected. It is one of the more common problems after major cancer surgery. This page explains the signs, who is more at risk, what you can do to protect your chest, and how it is treated. 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
- Why can a chest infection happen after surgery?
- What are the signs of a chest infection after surgery?
- How can you protect your chest before and after surgery?
- Who is more at risk of a chest infection after surgery?
- How is a chest infection after surgery treated?
- What do families often believe about the chest after surgery?
- Is it a chest infection, or a blood clot in the lung?
- Common questions about chest infection after surgery
The short answer
Why can a chest infection happen after surgery?
A chest infection after surgery, sometimes called post-operative pneumonia, happens because pain, anaesthesia and lying in bed make you breathe shallowly and cough less, so phlegm collects in the lungs and germs grow in it. It is one of the more common problems after major cancer surgery, and it is usually treated well when found early.
Why the chest is vulnerable
A general anaesthetic relaxes the muscles you use to breathe and to clear your airways. After surgery on the chest or upper abdomen, deep breaths and coughing hurt, so people naturally avoid them. The bottom parts of the lungs stop fully opening, and that is where infection starts.
When it usually shows
Most chest infections appear in the first few days after surgery, while you are still on the ward. Some start after you go home, especially if you are moving about very little.
What this page cannot tell you
Breathlessness and fever after surgery have several possible causes, including a blood clot in the lung and heart problems. This page cannot tell which one you have. A doctor's examination, an oxygen reading and usually a chest X-ray are needed.
What to look for
What are the signs of a chest infection after surgery?
You may notice one or several. Tell the nurse, or call the team if you are home, as soon as they start.
Cough and phlegm
A new or worsening cough, bringing up yellow, green or brown phlegm. Streaks of blood need to be mentioned straight away.
Fever and shivering
A high temperature, sweats or shaking, often a few days after the operation.
Breathing
Breathlessness at rest or on small effort, fast breathing, or needing more oxygen than before.
Chest pain
A sharp pain on breathing in or coughing, different from wound pain. Sudden chest pain must be checked for a clot.
Confusion or drowsiness
In older people, new confusion or unusual sleepiness can be the first or only sign.
A slower recovery
Feeling worse after a few better days, eating less and not wanting to get out of bed.
Not sure whether this applies to you?
Ask an oncologistWhat you can do
How can you protect your chest before and after surgery?
Stop smoking early
The sooner before surgery you stop, the more your airways recover. Even a short time helps. Ask your team for support to stop, including nicotine replacement.
Practise breathing exercises
Slow deep breaths in, held for a moment, then a gentle cough. Learning them before surgery makes them easier afterwards. You may be given a small device to breathe into.
Sit up and walk early
Sitting in a chair and walking from the first days opens the lungs far better than lying flat. Family can help by walking with you.
Support the wound and ask for pain relief
Hold a folded towel or pillow firmly over the wound when you cough. If pain stops you breathing deeply, tell the nurse. Good pain control is part of protecting your chest.
Who is more likely to get one
Who is more at risk of a chest infection after surgery?
- People who smoke, or stopped only recently
- Surgery on the lung, food pipe, stomach or upper abdomen
- Existing lung disease such as COPD or asthma
- Older age, weakness or heavy weight loss before surgery
- Long operations and a long stay in bed afterwards
- Trouble swallowing, which lets food or saliva slip into the lungs
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Treatment
How is a chest infection after surgery treated?
Most chest infections after surgery are treated with antibiotics, breathing support and chest physiotherapy, and improve over several days. The team starts antibiotics once an infection is likely, often before every test result is back.
What the tests are for
Blood tests show signs of infection. A chest X-ray shows where in the lungs it is. A sample of phlegm may be sent to find the germ, so the antibiotic can be changed if needed. If a blood clot is possible, a scan of the lungs may be arranged.
Physiotherapy and oxygen
A physiotherapist helps you clear phlegm with breathing techniques and positioning. Oxygen through a mask or small tubes in the nose is given if your levels are low. The antibiotics are usually through a drip at first, then tablets.
When more support is needed
A smaller number of people become very unwell and need care in the intensive care unit, with stronger breathing support. The team will explain clearly if this becomes likely, and why. Ask them to update the family each day.
Commonly believed
What do families often believe about the chest after surgery?
"She has just had a big operation, so she should rest flat in bed."
Lying flat is one of the main reasons chest infections start. Sitting up in a chair and short walks, as the team advises, keep the lungs open. Rest still matters, but not flat all day.
"Coughing will burst the stitches."
A gentle, supported cough with a pillow pressed over the wound is safe and important. Holding back the cough lets phlegm collect. Tell the nurse if coughing is too painful.
"He only smokes a few a day, so stopping before surgery will not matter."
Any smoking affects how well the airways clear phlegm. Stopping before surgery, even for a short time, helps. It also helps the wound heal.
"It is just a cold from the air conditioning in the ward."
A new cough with fever or breathlessness after surgery should be treated as a possible chest infection until a doctor has checked. Do not wait for it to pass.
Side by side
Is it a chest infection, or a blood clot in the lung?
More like a chest infection
More like a clot in the lung
Comes on over a day or two
Often comes on suddenly
Cough with coloured phlegm
Little phlegm, sometimes coughing up blood
Fever and shivering are common
Fever is usually mild or absent
Legs usually normal
A swollen, painful calf may come first
Questions we are asked
Common questions about chest infection after surgery
Is pneumonia after surgery serious?
It can be. Many people recover with antibiotics and physiotherapy, but a chest infection can make recovery slower and, in some people, lead to a need for intensive care. Older people and those with lung disease are more at risk. Early treatment makes a large difference, so report symptoms as soon as they start.
When should we come back if the cough started at home?
Call the team the same day for a new cough with fever or coloured phlegm. Go to the nearest emergency department if there is breathlessness at rest, chest pain, coughing up blood, blue lips, or new confusion. Bring the discharge summary and tell them what operation was done.
Can we take cough syrup at home?
Ask the team first. Some cough syrups stop you coughing up phlegm, which is the opposite of what the lungs need after surgery, and some interact with pain medicines. Do not start any new medicine, including antibiotics left over at home, without advice.
Does the breathing device really help?
It encourages slow, deep breaths that open the lower parts of the lungs. It works only if it is used regularly through the day, not once. The physiotherapist or nurse will show you how, and family can remind the patient to keep using it.
Will a chest infection delay going home?
Often, yes. You usually stay until breathing is comfortable, oxygen levels are safe without extra oxygen, the fever has settled and you can switch to antibiotic tablets. How long that takes varies from person to person.
Is it infectious to the family?
A chest infection after surgery is not usually passed on to healthy family members in the way flu is. Normal hygiene is sensible: washing hands, covering coughs and staying away if you have a cold yourself, since the patient is still recovering.
How long before surgery should smoking stop?
As early as possible. The lungs keep recovering the longer you stay stopped, but stopping at any point before surgery helps. Ask the team or your doctor about support to stop, because it is much easier with help than on willpower alone.
Can a chest infection be prevented completely?
Not completely. Stopping smoking, breathing exercises, good pain control, sitting up and walking early all lower the risk. Some people still develop one despite doing everything right. That is not a failure on their part, and it is treated when it happens.
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Dr. Vinay Mamidala
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Sources
- NHS — Pneumonia
- NHS — Chest infection
- NHS — Pulmonary embolism
- 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.
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