Draining fluid from the tummy (ascites)
A way of relieving discomfort by using a thin tube, put in under local anaesthetic, to drain fluid that has built up inside the tummy.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- Paracentesis drains fluid (ascites) to relieve a tight, heavy, breathless or uncomfortable tummy; it is a comfort treatment, not a cure.
- The fluid often comes back, so the drain may need to be repeated, or a longer-term tube may be offered.
- It is usually done under local anaesthetic, often with an ultrasound scan to find the safest place; most people feel relief within hours.
- Ask how much fluid will be removed, over how long, and what danger signs to watch for afterwards (fever, leaking, dizziness or pain).
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.
Relieves a tight, heavy or painful tummy
There is little or no free fluid to drain safely, so the procedure would not help.
You may feel pushing or mild pressure as the tube goes in, then a gradual easing as fluid drains. Tell the team if you feel faint, sweaty or unwell at any...
A named contact route for symptoms or worries after the drain.
You may feel pushing or mild pressure as the tube goes in, then a gradual easing as fluid drains. Tell the team if...
Fluid drains into a bag. Your blood pressure and pulse may be checked, and you may be given fluids through a vein...
A small dressing is applied. A little fluid may leak from the site for a day or two; the team will advise on...
Many people feel lighter and breathe more easily. Tiredness is common. Watch for fever, increasing pain, redness...
What is draining fluid from the tummy (paracentesis)?
Paracentesis is a procedure to drain fluid that has collected inside the tummy. This build-up is called ascites. It can happen with advanced cancer, liver disease and some other conditions, and it can make the tummy feel tight, heavy and sore, spoil your appetite, and make it hard to breathe.
A clinician numbs a small area of skin with local anaesthetic, then passes a thin, soft tube (a drain) through the tummy wall so the fluid can flow out into a bag. Many teams use an ultrasound scan first to find the safest spot, which lowers the risk of the needle touching an organ.
Paracentesis is mainly about comfort. It eases the symptoms the fluid is causing, but it does not treat the underlying illness, and the fluid often comes back over days or weeks. When that happens, the drain can be repeated, or a longer-term tube can sometimes be left in place.
This is a needle-and-drain procedure, not an operation. It does not leave a surgical scar, just a tiny puncture mark that usually heals on its own.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
Repeated drains versus a long-term tube
| Repeated paracentesis | Long-term (indwelling) drain | |
|---|---|---|
| How often | A new tube each time fluid builds up | Tube stays in; drained little and often |
| Where | Usually hospital or hospice | Often at home with nurse support |
| Main trade-off | Repeated visits and tube placements | Ongoing tube care and a small infection risk |
Which option suits you depends on how fast the fluid returns, your wishes and how easy travel is. Your palliative care team will talk this through with you.
Preparing for your procedure
- Talk with your clinician about why the drain is suggested, what it will ease, and what it cannot change.
- Mention any blood-thinning medicines (such as warfarin, apixaban, rivaroxaban or clopidogrel); a blood-clotting test is often done first.
- Tell the team if you have had bleeding problems, a swollen or scarred tummy, or previous tummy surgery.
- Empty your bladder before the procedure, as this lowers the risk of the bladder being in the way.
- Arrange for someone to be with you afterwards if you are going home the same day, especially if a lot of fluid is removed.
- Wear loose, comfortable clothing and bring something to do, as draining can take a few hours.
- Ask whether you should keep taking your usual diuretic (water) tablets and other medicines on the day.
What happens
You will usually lie on a bed, slightly propped up. The clinician feels your tummy and often uses an ultrasound scan to find the safest place with the most fluid and the least risk of touching an organ.
The skin is cleaned and numbed with local anaesthetic, which may sting briefly. A small nick is made and a thin, soft tube is passed through the tummy wall into the fluid. Putting the tube in takes only a few minutes and should not be painful, though you may feel pushing or pressure.
The tube is taped in place and connected to a drainage bag. The fluid then flows out over a period that can range from under an hour for a small amount to several hours for a large volume. Sometimes fluids are given through a vein at the same time to protect your blood pressure and kidneys.
When enough fluid has drained, or it stops flowing, the tube is removed and a small dressing is applied. Many people notice their tummy feels softer and their breathing easier straight away.
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 little or no free fluid to drain safely, so the procedure would not help.
- Severe, uncorrectable bleeding problems make the puncture too risky.
- Widespread bowel distension, large bowel obstruction or extensive adhesions raise the risk of organ injury.
- 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.
- There are signs of active infection that need treating.
- Blood pressure is already very low, until it is stabilised.
- Essential information, such as recent scans showing where the fluid sits, is missing.
Alternatives to discuss
- Water tablets (diuretics) and salt restriction, where the cause responds to them.
- A longer-term (indwelling) drain so fluid can be removed at home rather than by repeated taps.
- 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.
- A shunt to redirect fluid, considered only in selected cases.
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
- Relieves a tight, heavy or painful tummy
- Often eases breathlessness caused by pressure on the lungs
- Can improve appetite and make eating more comfortable
- May reduce swelling pushed down into the legs
- Usually gives noticeable comfort within hours
- Can be repeated, or set up as a home drain, to keep you comfortable over time
Risks & complications
- A little leaking of fluid from the puncture site after the tube comes out
- Mild discomfort or bruising where the tube went in
- Feeling tired or washed out for a short time afterwards
- Fluid building up again over the following days or weeks
- A drop in blood pressure if a large amount of fluid is removed quickly
- An effect on the kidneys after large-volume drainage
- Bleeding from the puncture site or, rarely, inside the tummy
- Infection at the puncture site or in the fluid (peritonitis)
- The needle or tube touching the bowel, bladder or another organ
- Bleeding heavy enough to need a blood transfusion or further treatment
- A serious complication that, very rarely, can be life-threatening
The most important risks are bleeding, a drop in blood pressure when a lot of fluid is removed, and infection. Using ultrasound to guide the tube lowers the chance of touching an organ. Ask how much fluid will be removed and over how long, whether you will need fluids through a vein, and who to call if you feel unwell, leak a lot of fluid, or develop a fever afterwards.
Published figures to discuss
Paracentesis is generally a low-risk comfort procedure, and using ultrasound to find a safe pocket of fluid lowers the risk further. Rates vary with how unwell the person is, their blood-clotting and how much fluid is removed. 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 |
|---|---|---|---|
| Bleeding needing a blood transfusion | Around 0.2% in a large review | Higher if blood-clotting is abnormal; clotting is usually checked first. | Paracentesis — StatPearls, NCBI Bookshelfncbi.nlm.nih.govPublished figure |
| Overall complications | About 1.4% with ultrasound guidance versus 4.7% without, in a study of around 1,300 procedures | Ultrasound guidance lowers the overall complication rate. | Paracentesis — StatPearls, NCBI Bookshelfncbi.nlm.nih.govPublished figure |
| Bowel or other organ injury | Extremely rare | No reliable single percentage; ultrasound guidance reduces this risk. | Paracentesis — StatPearls, NCBI Bookshelfncbi.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. Most people feel more comfortable soon after the fluid is drained, though tiredness and a little leaking from the site are normal at first.
- Feeling more comfortable and less bloated soon after draining
- Some tiredness for a day or so
- A small amount of fluid leaking from the puncture site at first
- Mild tenderness or bruising where the tube went in
- The tummy slowly filling up again over days or weeks
Aftercare
- Keep the dressing clean and dry, and change it as advised if the site leaks.
- Rest for the remainder of the day if a lot of fluid was removed.
- Drink and eat as normal unless your team advises otherwise.
- Take your usual medicines as advised, including any water tablets, unless told to pause them.
- Watch the puncture site for redness, swelling, heat or heavy leaking.
- Note whether your tummy starts to feel tight again, so the team can plan the next step.
- Keep the contact number for your palliative care team or ward to hand.
- Someone to be with you for the rest of the day
- Spare dressings or pads in case of leaking
- Comfortable, loose clothing
- List of your current medicines
- Contact number for your palliative care team, hospice or ward
- A note of any blood-thinning medicines you take
⚠ Get urgent help if…
- A high temperature, shivering or feeling generally unwell (possible infection)
- Increasing tummy pain rather than relief
- Redness, swelling, heat or pus at the puncture site
- Heavy or continuous leaking of fluid that soaks dressings
- Feeling dizzy, faint or very weak (possible low blood pressure)
- Passing much less urine than usual
- Bleeding from the site that does not stop with gentle pressure
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 simply feeling more comfortable: a softer, less heavy tummy, easier breathing and often a better appetite. This relief can come within hours of draining.
Paracentesis treats the symptom, not the cause. It does not slow or treat the underlying illness, and it cannot stop the fluid returning. Many people need the drain more than once, or move to a longer-term tube, to stay comfortable.
How long the relief lasts varies a lot. For some people the tummy stays comfortable for a couple of weeks; for others the fluid returns within days. As the underlying illness changes, the fluid often comes back faster. Your team will keep reviewing whether repeating the drain, adjusting medicines, or placing a longer-term tube gives the best comfort with the least disruption.
Related tests, treatments or support
Paracentesis is often used alongside other comfort measures, such as water tablets (diuretics), medicines for pain, nausea or breathlessness, and dietary advice. If the fluid is caused by cancer, treatment of the cancer itself may sometimes slow the build-up. Your palliative care team will look at the whole picture rather than the fluid alone.
Follow-up & long-term care
After the drain, your palliative care team, hospice or ward will check how you feel and whether the fluid is returning. They will plan when, or whether, to drain again, review your medicines, and arrange community nurse support if a longer-term tube is used. You should be given a clear contact route in case you feel unwell between visits.
- If a long-term tube is in place, it needs regular, gentle drainage and dressing care, usually by a nurse.
- The site is checked for signs of infection or blockage.
- Your weight, comfort and symptoms are monitored to guide how often to drain.
- Medicines such as diuretics may be adjusted over time.
Repeat, follow-on and what comes next
- Because the fluid usually returns, repeat drainage is common and expected, not a sign that something went wrong.
- If repeats are needed often, a longer-term tube may be offered to avoid frequent re-punctures.
- Occasionally a drain stops flowing or blocks and needs repositioning or replacing.
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 symptoms or worries after the drain.
- Clear written advice on dressing care and what to do if the site leaks.
- A plan for monitoring fluid build-up and deciding when to drain again.
- Joined-up working between the palliative care 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 drain or a longer-term (indwelling) tube is used
- Whether ultrasound guidance and a radiologist are involved
- Day-case facility or hospital bed time while the fluid drains
- Any fluids given through a vein and blood tests before the procedure
- Laboratory testing of the fluid if a sample is sent
- Community nurse visits for ongoing drainage and dressing care at home
- Follow-up reviews and how often the drain needs repeating
- The clinician or radiologist fee for placing the drain
- Facility or bed fee for the time spent draining
- Whether ultrasound guidance is included
- Cost of any blood tests, fluids through a vein, or laboratory analysis
- Cost and care arrangements for a longer-term tube, if used
- Follow-up reviews and repeat drainage
- What happens, and who pays, if a complication occurs
On the NHS? Draining ascites 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 very likely to come back, so the relief is temporary.
- No clear plan or contact route for what to do if you feel unwell afterwards.
- Removing a very large volume without discussing the effect on blood pressure and kidneys.
- Treating drainage as a routine that continues without revisiting whether it still helps you.
- 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 drainage without considering home drainage 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.
- Why is the fluid building up, and is there anything treating the cause as well as the symptom?
- How much fluid do you plan to remove, and over how long?
- Will I need fluids through a vein to protect my blood pressure and kidneys?
- Should I keep taking my water tablets and blood-thinning medicines on the day?
- If the fluid comes back quickly, would a longer-term tube be better for me?
- Who do I call if I feel unwell, leak a lot of fluid, or get 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 paracentesis painful?
How much fluid can be drained?
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: Cambridge University Hospitals NHS — Paracentesis patient information Worcestershire Acute Hospitals NHS — Paracentesis of ascites Macmillan Cancer Support — Ascites (fluid in the tummy) Paracentesis — StatPearls, NCBI Bookshelf Paracentesis for cancer-related ascites in palliative care: prospective cohort — PubMed
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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