Revisional bariatric surgery (Revisional (redo) weight-loss surgery)
A second weight-loss operation to correct a problem from a previous one, or to change to a different procedure, when the first has caused complications or is no longer working.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- Revisional surgery is a second weight-loss operation to fix a complication, change procedure, or address weight regain or inadequate loss.
- It is generally more complex and higher-risk than first-time bariatric surgery because of scar tissue and changed anatomy.
- It does not guarantee further weight loss or symptom relief, and weight can still return.
- It should be planned by a specialist multidisciplinary team after a clear assessment of why the first operation did not achieve the goal.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your surgeon will give you advice for your situation.
Can correct a complication of a previous operation, such as severe reflux or a stricture
When the real issue is eating patterns or behaviour that surgery alone will not fix, without addressing those first.
You recover in hospital with pain relief and early gentle movement to lower the risk of clots and chest infection. You start sips of fluid as advised.
Structured, long-term follow-up with the bariatric team and dietitian.
You recover in hospital with pain relief and early gentle movement to lower the risk of clots and chest infection...
You follow a staged diet, usually liquids then purées, with small amounts and careful chewing. Tiredness is normal...
Diet textures progress under the dietitian's plan and you gradually return to normal activity. Wounds heal over...
Weight change and any symptom relief build. Regular follow-up checks nutrition, vitamins and progress.
What is revisional bariatric surgery?
Revisional bariatric surgery is a second weight-loss operation, done after a first one. It may correct a complication of the first procedure, change one operation into another, or address weight that has come back or never shifted enough.
Common examples are converting a gastric band to a sleeve gastrectomy or gastric bypass, converting a sleeve to a bypass (often for severe reflux or weight regain), or redoing part of a previous bypass. The right option depends on what was done before, what the problem is now, and your overall health.
These operations are generally more complex and carry higher risks than first-time (primary) bariatric surgery, because of scar tissue and altered anatomy. They also do not guarantee the weight loss or symptom relief people hope for, and weight regain can still happen afterwards.
Revisional surgery should be considered carefully within a specialist multidisciplinary team, with a clear reason, realistic expectations, and attention to diet, behaviour and other treatments — not as an automatic fix when a first operation disappoints.
Types & techniques
There isn't one single operation. The right approach depends on you — which is something to discuss with your surgeon.
First-time compared with revisional surgery
| First-time surgery | Revisional surgery | |
|---|---|---|
| Anatomy | Normal | Altered, with scar tissue |
| Complexity | Lower | Higher |
| Risk | Lower | Higher |
| Weight result | More predictable | Less predictable |
Revisional surgery tends to carry more risk and less certain results than first-time surgery. The reason for revision matters as much as the operation chosen.
Preparing for your surgery
- Have a full assessment by a specialist bariatric multidisciplinary team, including why the first operation did not achieve the goal.
- Bring records of your previous operations — what was done, when, and any complications.
- Expect tests to map your current anatomy, such as a contrast swallow, endoscopy or scans.
- Work with a dietitian and, where relevant, a psychologist before surgery, as behaviour and eating patterns strongly affect results.
- Optimise other conditions (such as diabetes, reflux, sleep apnoea) and stop smoking well beforehand.
- Discuss realistic expectations, the higher risks, and the chance that weight may still return.
What happens
Revisional surgery is done under general anaesthetic, usually by keyhole, though it is often more involved than first-time surgery and occasionally needs open surgery. The surgeon first carefully frees the previous anatomy from scar tissue, then carries out the planned change — for example removing a band and forming a sleeve or bypass, or converting a sleeve to a bypass.
Because the tissues have been operated on before, these steps take longer and demand particular care to avoid injury to the stomach, bowel or nearby organs. The exact procedure is tailored to what was done previously and the problem being addressed.
Most people stay in hospital for one to a few nights. Recovery and the build-up of diet textures follow a staged plan, much like first-time surgery but often a little slower, with close dietitian support.
Is this operation 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…
- When the real issue is eating patterns or behaviour that surgery alone will not fix, without addressing those first.
- When the higher risks of revision outweigh the likely benefit for that person.
- When expectations are unrealistic — for example expecting guaranteed weight loss.
- When the person is not fit enough for a longer, more complex general anaesthetic procedure.
Delay surgery if…
- There is an active infection or an unstable medical problem that could be optimised first.
- Smoking, poorly controlled diabetes or other risk factors could be improved beforehand.
- Dietitian and psychological assessment and preparation are not complete.
- Investigations mapping the current anatomy are not yet done.
- Blood-thinning medicines have not been planned around surgery.
Alternatives to discuss
- Intensive dietitian and behavioural support without further surgery.
- Weight-loss medicines as part of a wider plan.
- Treating a specific complication non-surgically where possible (for example reflux medication).
- Accepting and managing the current situation if revision risk is too high.
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.
Anaesthetic choices
The safest option depends on the operation, your health, the facility and your surgeon/anaesthetist. Ask what is planned and why.
Benefits
- Can correct a complication of a previous operation, such as severe reflux or a stricture
- Can offer further weight loss when a first operation has not been enough
- Can change to a procedure better suited to your needs
- Can improve obesity-related conditions if further weight loss is achieved
- Allows a fresh, supported plan with dietitian and team input
Risks & complications
- Sore tummy and shoulder-tip discomfort for several days after keyhole surgery
- Tiredness and a slower recovery than first-time surgery
- Nausea and the need to relearn eating slowly with small portions
- Temporary changes in bowel habit
- Wound or chest infection
- A narrowing (stricture) where the stomach or bowel has been joined or reshaped
- Nutritional deficiencies needing supplements and monitoring
- Slow progress with diet, or ongoing reflux
- A leak where the stomach or bowel has been joined, which can be serious and need further surgery
- Bleeding or a blood clot in the legs or lungs
- Injury to the stomach, bowel or nearby organs
- A complication serious enough to be life-threatening
The central point is that revisional surgery generally carries higher risks than first-time bariatric surgery, including a greater chance of serious complications such as a leak. It also does not guarantee the result you want. A specialist team should explain your individual risk based on your previous surgery and health, and be honest that weight can still come back. Severe pain, a fast heartbeat, fever or breathlessness after surgery must be treated as urgent.
Published figures to discuss
Revisional surgery generally carries higher risks than first-time bariatric surgery, and results are less predictable. Exact figures depend heavily on the previous operation, the revision chosen, and the person's health, and studies vary. The statements below are cautious and drawn from reviews; they should not be read as precise predictions for any individual.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Serious complications | Higher than after first-time bariatric surgery; pooled morbidity around 13% in some revisional series | Reviews consistently report greater odds of complications, including leaks, with revisional surgery; risk depends strongly on the operation being revised. | Revisional bariatric surgery due to complications — PubMedpubmed.ncbi.nlm.nih.govPublished figure |
| Death around the operation | Low, but generally higher than first-time surgery; published revisional series often report 0–1.4% | Risk varies with age, weight, diabetes, previous complications and the complexity of the revision; your team should give your individual estimate. | Revisional bariatric surgery due to complications — PubMedpubmed.ncbi.nlm.nih.govPublished figure |
| Weight regain after revision | Can still occur | Revision does not guarantee durable weight loss; behaviour and follow-up strongly affect the result. | Revisional bariatric surgery due to complications — PubMedpubmed.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.
Recovery — what to expect, and when
Recovery follows a staged plan similar to first-time weight-loss surgery, but is often a little slower because the surgery is more complex. Most people are back to light activity within a few weeks, guided closely by the dietitian.
- Feeling full quickly and relearning to eat slowly
- Tiredness and a slower recovery than the first operation
- Shoulder-tip and tummy discomfort for several days
- Gradual, not instant, weight change over months
Aftercare
- Follow the staged diet plan and take small, well-chewed amounts.
- Take prescribed vitamins and minerals and attend blood-test monitoring.
- Move gently early on to reduce the risk of clots, and take pain relief as advised.
- Keep wounds clean and dry and follow dressing advice.
- Stay engaged with dietitian and psychology support for eating patterns.
- Know who to contact urgently for severe pain, fever, vomiting or breathlessness.
- Records of previous surgery to hand
- Someone to drive you home and help in the first days
- Several weeks off work arranged
- Staged diet plan and supplements ready
- Dietitian and follow-up appointments booked
- Out-of-hours number saved for urgent problems
Scars and how they heal
Revisional surgery is usually keyhole, leaving several small scars on the tummy, including some from your previous operation. If open surgery is needed, the scar is larger. Scars fade over months.
⚠ Get urgent help if…
- Severe or worsening tummy pain
- A fast heartbeat, fever or feeling very unwell (possible signs of a leak or infection)
- Breathlessness, chest pain or a swollen, painful calf
- Persistent vomiting or being unable to keep fluids down
- Vomiting blood or passing black, tarry stools
- Signs of dehydration or not passing urine
Who to contact: your surgeon or clinic 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 surgeon gives you.
Results & realistic expectations
When revisional surgery is done for the right reason, it can relieve a complication such as severe reflux or a stricture, or provide further weight loss. Results build over months and depend heavily on diet, behaviour and follow-up.
It is important to be realistic: revisional surgery does not reliably match the weight loss of first-time surgery, and weight can still return. It also carries higher risks. A good team frames it as one part of a wider plan, not a guaranteed solution, and is honest about what it can and cannot achieve for you.
Like first-time bariatric surgery, the durability of revisional surgery depends on long-term changes to eating, activity and follow-up. Weight regain can happen after any weight-loss operation. After a bypass especially, lifelong vitamin and mineral supplements and monitoring are needed to protect your health.
Combining with other procedures
Revisional surgery is often combined with removing a previous device (such as a band) or repairing a hiatus hernia. It sits alongside dietitian and psychology input, treatment of obesity-related conditions, and sometimes weight-loss medicines as part of an overall plan.
Follow-up & long-term care
You should have structured, long-term follow-up with the bariatric team and dietitian, including blood tests to monitor nutrition. Report severe pain, fever, vomiting or breathlessness urgently. Ongoing support for eating patterns and weight is an expected part of care, not an optional extra.
- Take lifelong vitamin and mineral supplements as advised, especially after a bypass.
- Attend regular blood-test monitoring for deficiencies.
- Stay engaged with dietitian and behavioural support.
- Seek prompt help for persistent vomiting, pain or swallowing problems.
- Keep records of all your bariatric operations for future care.
Revision and secondary surgery reality
- Revisional surgery is itself sometimes followed by further surgery if problems persist.
- Scar tissue makes operating harder and raises the chance of converting to open surgery.
- Some complications (such as leaks or strictures) are managed over weeks with further procedures.
- Nutritional problems may need long-term management, especially after a bypass.
Ask your surgeon for their own revision rate, what counts as a revision, and what is included in the written aftercare policy.
What good aftercare looks like
- Structured, long-term follow-up with the bariatric team and dietitian.
- Regular blood tests to monitor for nutritional deficiencies.
- Ongoing behavioural and psychological support for eating patterns.
- A named contact and clear urgent warning signs in writing.
- A clear plan for managing any complication or further weight regain.
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:
- The complexity of the revision and the operating time involved
- Surgeon and anaesthetist fees
- Theatre, facility and length of hospital stay
- Tests to map your current anatomy beforehand
- Dietitian and psychology input before and after surgery
- Long-term follow-up and nutritional monitoring
- Management of any complications, which are more likely than after first-time surgery
- Surgeon, anaesthetist and facility fees
- Pre-operative tests and assessments
- Length of hospital stay included
- Dietitian and psychology support, before and after
- Long-term follow-up and blood-test monitoring
- Cancellation policy
- What happens, and what it costs, if a complication occurs
On the NHS? Revisional bariatric surgery is available on the NHS within clinical criteria, particularly for complications; private access may be chosen for speed or convenience.
You're entitled to your total cost in writing — including aftercare and any revision — 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
- Presenting revision as a guaranteed fix for weight regain.
- Not clearly explaining the higher risk compared with first-time surgery.
- Skipping the question of why the first operation did not work.
- No discussion of lifelong supplements and monitoring.
- Not involving dietitian and psychological support in the decision.
Marketing red flags
- Promising specific weight-loss figures from revision.
- Downplaying the higher complication risk of redo surgery.
- Recommending surgery without a multidisciplinary assessment.
- Not mentioning the need for long-term follow-up and supplements.
Choosing a surgeon safely
- Check your surgeon is on the GMC Specialist Register for this area.
- Make sure they practise at a CQC-registered location, and look for membership of bodies like BAAPS or BAPRAS.
- You're entitled to a two-stage consent process with time to reflect (a cooling-off period). The surgeon who will operate must consent you — not a salesperson.
- Be wary of pressure: time-limited offers, discounts 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 aftercare and any revision — before you decide.
Questions to ask your medical professional
Take this to your consultation. A good surgeon will welcome every one of these.
- Exactly why did my first operation not achieve the goal, and how will this address that?
- What are my individual risks given my previous surgery and health?
- How much further weight loss, or symptom relief, is realistic for me?
- Will this be done in one operation or staged?
- What long-term monitoring and supplements will I need?
- What support is there for eating patterns and weight regain?
- 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 surgeon who carries out my operation, 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 operation 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
Why is revisional surgery riskier than my first operation?
Will I lose as much weight as the first time?
Is revisional surgery available on the NHS?
Can a gastric band be converted to another operation?
What is done for severe reflux after a sleeve?
Do I still need vitamins after revisional surgery?
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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: NHS — Weight loss surgery BOMSS — nutritional monitoring after bariatric surgery (PMC) Revisional bariatric surgery due to complications — PubMed Revisional bariatric surgery — review (PubMed) Revisional bariatric surgery: focus on quality of life — PMC Systematic review and meta-analysis of revisional bariatric surgery outcomes — 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.
Related guides: Gastric band removal or adjustment · Gastric bypass (Roux-en-Y) · Gastric sleeve (sleeve gastrectomy) · Gastric band surgery · Partial stomach removal (partial gastrectomy)