Draining fluid from around the lung (pleural effusion)
A way of easing breathlessness by using a needle or thin tube, put in under local anaesthetic, to drain fluid that has built up around a lung.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- Draining a pleural effusion relieves breathlessness and chest heaviness; it is a comfort treatment, not a cure.
- An ultrasound scan is used to find a safe spot, which greatly lowers the risk of a collapsed lung (pneumothorax).
- The fluid can return, so you may need repeat draining, a tube that stays in for home drainage, or pleurodesis to stop it coming back.
- Ask how much fluid will be removed, whether you might feel a cough or tightness as the lung re-expands, and who to call if you become more breathless afterwards.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your specialist will give you advice for your situation.
Eases breathlessness caused by fluid pressing on the lung
There is too little free fluid to drain safely, so the procedure would not help.
You may feel pushing, an urge to cough or chest tightness as the lung re-expands. Tell the team if you feel faint, very breathless or in pain so they can...
A named contact route for breathlessness, chest pain or worries after the procedure.
You may feel pushing, an urge to cough or chest tightness as the lung re-expands. Tell the team if you feel faint...
Breathlessness often eases as fluid drains. A chest X-ray is sometimes done afterwards to check the lung...
A small dressing covers the site. You can usually go home the same day once the team is happy you are stable.
The tube is secured and managed by the team or, for an indwelling catheter, by a nurse at home. You will be shown...
What is draining fluid from around the lung (pleural effusion drainage)?
There is normally a thin layer of fluid in the space between the lung and the chest wall (the pleural space). Sometimes too much fluid builds up here — a pleural effusion — and presses on the lung. This can make you breathless, give you a dragging or heavy feeling in the chest, and bring on a cough.
Pleural effusion drainage removes that fluid. A clinician numbs a small area of skin with local anaesthetic and passes a needle or a thin, soft tube between the ribs to let the fluid out. Almost always an ultrasound scan is used to find a safe pocket of fluid and avoid the lung and other organs.
The main aim is comfort: easing breathlessness and the heavy feeling in the chest. It does not treat the underlying illness, and the fluid can come back. Depending on the cause, options include a one-off tap, repeated draining, a tube that stays in so you can be drained at home, or a procedure to stick the lung lining together (pleurodesis) to stop fluid returning.
This is a needle-or-drain procedure, not an operation. It leaves a small puncture mark rather than a surgical scar.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
Indwelling tube versus pleurodesis
| Indwelling catheter (IPC) | Pleurodesis | |
|---|---|---|
| Where | Mostly outpatient; drained at home | Usually needs a hospital stay |
| How it works | Fluid drained regularly through a tube | Lung lining stuck together to stop refilling |
| Main trade-off | Ongoing tube care and small infection risk | More upfront procedure; may need repeating |
Both are recommended first-line options for fluid caused by cancer. The right choice depends on your wishes, your general health and whether the lung can fully re-expand.
Preparing for your procedure
- Talk with your clinician about why drainage is suggested, what it will ease, and what it cannot change.
- Mention any blood-thinning medicines (such as warfarin, apixaban, rivaroxaban or clopidogrel); these may need pausing and clotting may be checked.
- Tell the team about lung conditions, previous chest drains, or chest surgery.
- Plan to sit still and lean forward on a support during the procedure, as this opens the spaces between the ribs.
- Arrange for someone to be with you afterwards if you are going home the same day.
- Wear loose clothing that is easy to remove from the upper body.
- Ask whether you should take your usual medicines on the day.
What happens
You will usually sit upright, leaning forward onto a pillow or table to open up the spaces between your ribs. The clinician uses an ultrasound scan to find the safest place with the most fluid and the least risk of touching the lung.
The skin is cleaned and numbed with local anaesthetic, which may sting briefly. A needle or a thin tube is then passed between two ribs into the fluid. You may feel pushing or pressure, but it should not be sharply painful — tell the team if it is.
Fluid is drained into a bottle or bag. As the lung re-expands you may get an urge to cough or a tight feeling in the chest; this is normal, but the team may slow or pause draining if it is uncomfortable. They usually limit how much is taken at one time to lower the risk of the lung re-expanding too quickly.
For a simple tap, the needle is removed and a small dressing applied. For a drain or an indwelling tube, the tube is secured and you are shown, or a nurse arranges, how it will be managed. Many people feel less breathless within minutes to hours.
Is this procedure right for me?
A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.
May not be suitable if…
- There is too little free fluid to drain safely, so the procedure would not help.
- Severe, uncorrectable bleeding problems make the puncture too risky.
- The lung cannot re-expand (trapped lung), which changes which option helps and makes some approaches less useful.
- The burden of the procedure outweighs the benefit very close to the end of life, where gentler comfort measures may be kinder.
Delay or rearrange if…
- Blood-clotting tests are abnormal and can be corrected first.
- Blood-thinning medicines need pausing before the procedure.
- There are signs of active infection that need treating.
- Recent scans showing where the fluid sits are not available to guide the procedure safely.
Alternatives to discuss
- Medicines, a handheld fan, breathing techniques and oxygen to ease breathlessness without draining.
- An indwelling pleural catheter so fluid can be drained at home rather than by repeated taps.
- Pleurodesis to try to stop the fluid returning, in suitable people.
- Treating the underlying illness, such as cancer treatment, where this may slow fluid build-up.
- Choosing comfort-focused care without drainage if the procedure would be too burdensome.
Before you decide
Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.
What matters most to me?
Think about symptoms, daily life, work, caring responsibilities, sport, fertility, travel, appearance and anxiety — the right choice depends on your priorities, not just the medical facts.
What are all my options?
Ask about waiting, monitoring, medicines, rehabilitation, a smaller or larger procedure, a different test, NHS referral, or a second opinion where that would help.
What would make me pause?
Active infection, pregnancy, unstable medical problems, smoking, medicines that increase bleeding, poor support at home, or feeling pressured are all reasons to slow down and get tailored advice.
What happens if I do nothing today?
For some problems, waiting is safe; for others, delay can make treatment harder. A good consultation should explain the trade-off in plain English.
Comfort, sedation or contrast choices
If local anaesthetic, sedation, contrast or pain relief is used, ask what is planned, why, and what it means afterwards.
Benefits
- Eases breathlessness caused by fluid pressing on the lung
- Relieves a heavy, tight or dragging feeling in the chest
- Can reduce a troublesome cough caused by the fluid
- Often gives noticeable relief within minutes to hours
- Can be repeated, or set up as a home drain, to keep you comfortable
- A sample of the fluid can help work out what is causing the build-up
Risks & complications
- Mild discomfort, bruising or tenderness where the needle or tube went in
- An urge to cough or a tight feeling as the lung re-expands
- Feeling faint or light-headed during the procedure (a vasovagal reaction)
- The fluid building up again over the following days or weeks
- A small amount of air getting into the chest (pneumothorax), sometimes needing observation or a drain
- Bleeding or bruising at the site
- Infection at the site or in the pleural space
- Fluid leaking around the tube or the tube becoming blocked
- A larger pneumothorax needing a chest drain
- The lung re-expanding too quickly and causing fluid in the lung (re-expansion pulmonary oedema)
- The needle or tube touching the lung, liver, spleen or a blood vessel
- A serious complication that, very rarely, can be life-threatening
The best-known risk is a small air leak that can partly collapse the lung (pneumothorax). Using ultrasound to guide the procedure greatly lowers this risk. Removing too much fluid too fast can rarely cause fluid to flood back into the lung, so teams usually limit the volume. Ask how much fluid will be removed, whether ultrasound will be used, and who to call if you become more breathless, develop chest pain or run a fever afterwards.
Published figures to discuss
Pleural drainage is generally a low-risk comfort procedure, and using ultrasound to find a safe pocket of fluid sharply lowers the main risk of a collapsed lung. Rates vary with how the procedure is done, how much fluid is removed and the person's underlying health. The figures below are cautious ranges from published series and should be read as a guide, not a promise.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Collapsed lung (pneumothorax) with ultrasound guidance | Around 1% (3 of 310 procedures) in a study of 445 cancer patients | Far lower than without ultrasound, where the same study reported about 9%. | Ultrasound guidance reduces pneumothorax in thoracentesis (445 patients) — PMCpmc.ncbi.nlm.nih.govPublished figure |
| Collapsed lung (pneumothorax) without ultrasound guidance | Reported around 9%, and higher in some older series | This is why ultrasound guidance is now standard practice. | Ultrasound guidance reduces pneumothorax in thoracentesis (445 patients) — PMCpmc.ncbi.nlm.nih.govPublished figure |
| Re-expansion fluid in the lung (re-expansion pulmonary oedema) | Uncommon | Risk rises if a large volume is removed quickly, so teams usually limit how much is drained at once. | Ultrasound guidance reduces pneumothorax in thoracentesis (445 patients) — PMCpmc.ncbi.nlm.nih.govSource-linked context |
These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.
What happens afterwards
There is no real physical recovery in the way there is after an operation. Many people breathe more easily soon after the fluid is drained, though some tiredness, mild site soreness and a cough as the lung re-expands are normal at first.
- Breathing more easily soon after the fluid is drained
- A cough or tight feeling as the lung re-expands, settling over hours
- Mild soreness or bruising at the puncture site
- Some tiredness for a day or so
- The fluid slowly returning over days or weeks
Aftercare
- Keep the dressing clean and dry, and change it as advised.
- Rest for the remainder of the day, especially after a larger drainage.
- Take pain relief as advised if the site is sore.
- If you have an indwelling tube, follow the nurse's instructions for draining and dressing care.
- Watch the site for redness, swelling, heat or leaking.
- Note any return of breathlessness so your team can plan the next step.
- Keep the contact number for your palliative care team, respiratory team or ward to hand.
- Someone to be with you for the rest of the day
- Spare dressings or pads in case of leaking
- Loose, easy-to-remove upper-body clothing
- List of your current medicines
- Contact number for your palliative care, respiratory team or ward
- A note of any blood-thinning medicines you take
⚠ Get urgent help if…
- Sudden or worsening breathlessness after the procedure
- Sharp or severe chest pain
- A high temperature, shivering or feeling generally unwell (possible infection)
- Coughing up blood
- Redness, swelling, heat or pus at the puncture site
- Heavy or continuous fluid leaking from the site or around a tube
- Feeling dizzy, faint or with a racing heart
Who to contact: your clinician, clinic or test provider first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.
General guidance — it doesn't replace the specific advice your specialist gives you.
Results & realistic expectations
A good result is breathing more easily and a lighter, more comfortable chest, often within minutes to hours of draining. A sample of fluid can also help the team understand what is causing the build-up.
Drainage treats the symptom, not the cause. The fluid can return, sometimes quickly, and some people need repeated draining, a tube that stays in, or pleurodesis to keep the fluid away. How well the lung re-expands also affects which option works best.
How long the relief lasts depends on the cause. After a simple tap the fluid may return within days or weeks. An indwelling tube allows ongoing control at home, and pleurodesis aims to stop the fluid returning, though it does not always work fully. As the underlying illness changes, the build-up can speed up, and your team will keep reviewing the kindest, most effective approach.
Related tests, treatments or support
Pleural drainage is often used alongside other comfort measures for breathlessness, such as medicines, a handheld fan, breathing techniques and oxygen where it helps. If cancer is the cause, treatment of the cancer itself may sometimes slow the fluid. An indwelling tube and pleurodesis are sometimes combined. Your palliative care and respiratory teams will plan this together.
Follow-up & long-term care
After drainage, your palliative care or respiratory team will check your breathing and whether the fluid is returning. They will plan repeat draining, an indwelling tube or pleurodesis as needed, arrange community nurse support for a tube at home, and review fluid test results. You should be given a clear contact route if you become more breathless or unwell between visits.
- An indwelling pleural catheter needs regular, gentle drainage and dressing care, usually by a nurse.
- The site and tube are checked for signs of infection or blockage.
- Your breathing and comfort are monitored to guide how often to drain.
- If pleurodesis is planned, the team checks whether the lung has re-expanded enough for it to work.
Repeat, follow-on and what comes next
- Because the fluid can return, repeat draining is common and expected, not a sign that something went wrong.
- If repeats are needed often, an indwelling tube or pleurodesis may be offered.
- An indwelling tube can sometimes block or become infected and need attention or replacing.
- Pleurodesis does not always work fully, and some people need further drainage afterwards.
Ask what happens if the result is unclear or needs repeating, and what is included if further tests or follow-up are needed.
What good aftercare looks like
- A named contact route for breathlessness, chest pain or worries after the procedure.
- Clear written advice on site and tube care, and what to do if it leaks.
- A plan for monitoring fluid build-up and deciding the next step.
- Joined-up working between the palliative care team, respiratory team, GP and community nurses.
- Honest, gentle review of whether continued drainage is still right for you.
What affects the cost
Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:
- Whether a one-off tap, a temporary drain, an indwelling tube or pleurodesis is used
- Ultrasound guidance and the clinician or radiologist involved
- Day-case facility or hospital bed time
- A chest X-ray or other checks after the procedure
- Laboratory testing of the fluid if a sample is sent
- Community nurse visits for ongoing drainage of an indwelling tube at home
- Follow-up reviews and how often draining needs repeating
- The clinician or radiologist fee for the procedure
- Facility or bed fee
- Whether ultrasound guidance and a post-procedure X-ray are included
- Cost of any laboratory analysis of the fluid
- Cost and care arrangements for an indwelling tube or pleurodesis, if used
- Follow-up reviews and repeat draining
- What happens, and who pays, if a complication occurs
On the NHS? Draining a pleural effusion to relieve symptoms is a routine part of NHS and hospice palliative care; private drainage may be chosen for speed or convenience but is not a private-only treatment.
You're entitled to your total cost in writing — including reports, follow-up and what happens if the result is inconclusive — before you decide.
Consent traps and marketing red flags
These are not small details. They are often where patients lose choice, time to reflect, or realistic expectations.
Consent traps
- Not being told the fluid is likely to come back, so a single tap may not be the end of it.
- No clear plan or contact route for worsening breathlessness or chest pain afterwards.
- Removing a very large volume in one go without explaining the small risk of re-expansion oedema.
- Not discussing the choice between repeated taps, an indwelling tube and pleurodesis.
- No discussion of gentler comfort-only options when the procedure becomes burdensome.
Marketing red flags
- Suggesting the drain treats the underlying illness rather than just the symptom.
- Describing it as completely without risks or usually not painful.
- Not mentioning ultrasound guidance or who is available if a complication occurs.
- Pressing for repeated private taps without considering an indwelling tube, pleurodesis or NHS pathways.
Choosing a specialist safely
- Check the specialist is on the GMC Specialist Register for this area.
- Make sure they work at a CQC-registered service, and look for membership of the relevant Royal College or professional body.
- You're entitled to time to consider and to have your questions answered before you agree — the specialist who looks after you should explain it, not a salesperson.
- Be wary of pressure: time-limited offers or deposits taken before you've had time to think are red flags, not bargains.
- You're entitled to your total cost in writing — including any follow-up — before you decide.
Questions to ask your medical professional
Take this to your consultation. A good specialist will welcome every one of these.
- What is causing the fluid, and is anything treating the cause as well as the symptom?
- Will you use ultrasound to guide the procedure?
- How much fluid will you remove, and might I feel a cough or tightness as the lung re-expands?
- If the fluid keeps coming back, would an indwelling tube or pleurodesis suit me better?
- Should I pause any blood-thinning medicines beforehand?
- Who do I call if I become more breathless, get chest pain or a fever afterwards?
- Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
- Will you be the specialist who carries out my procedure, and who looks after me afterwards?
- What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
- What does a realistic result look like — and what can this procedure not achieve?
- What are my options, including waiting, doing nothing for now, or choosing a different approach?
- Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
- What is the total cost in writing, including any follow-ups, and how much time do I have to decide?
Frequently asked questions
Is draining fluid from the chest painful?
How much fluid is removed at once?
Will the fluid come back?
Can this be done at home or in a hospice?
Is it available on the NHS?
Will it leave a scar?
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How we made this page
Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →
Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.
Sources & standards: British Thoracic Society — Guideline for pleural disease (2023) British Thoracic Society — Clinical statement on pleural procedures (2023) Macmillan Cancer Support — Pleural effusion (fluid around the lungs) Ultrasound guidance reduces pneumothorax in thoracentesis (445 patients) — PMC Pleural procedures in malignant effusions — review, PMC NHS England — National Patient Safety Alert: deterioration from rapid offload of pleural effusion fluid (2020)
Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.
Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.
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