Acid reflux is one of the more commonly discussed side effects of gastric sleeve surgery – and for good reason. The same changes to stomach anatomy that make the sleeve effective can also affect how acid is managed, and for some patients this becomes a significant ongoing issue. This post covers what we’ve experienced personally with reflux and omeprazole over two years post-op, and what you should know before surgery if GORD is already a factor for you.
Why gastric sleeve surgery can worsen reflux
The sleeve removes roughly 75-80% of the stomach, including part of the fundus – the area that normally acts as a reservoir, reducing pressure on the lower oesophageal sphincter. Without that reservoir function, pressure inside the remaining stomach can increase, making it easier for acid to travel upward into the oesophagus.
The pyloric valve is preserved after a sleeve, unlike after gastric bypass. Some evidence suggests this can contribute to higher intragastric pressure and increased reflux risk compared to bypass procedures. The practical result: some patients who had no reflux before surgery develop it afterwards, and patients who already had GORD can find it significantly worsened. This is worth discussing with your surgeon before proceeding – in some cases, gastric bypass is a better choice for people with pre-existing GORD.
Our experience
James developed acid reflux around two to three months post-op – burning discomfort in the chest, particularly at night and after eating. His bariatric nurse prescribed omeprazole 20mg daily, which helped significantly within a few days. James continued it for several months before a trial reduction under GP guidance. He now takes it only as needed. Two years on, reflux surfaces occasionally after eating too quickly but is no longer a daily presence. Kirsten experienced milder reflux and managed it mainly with dietary adjustments.
What omeprazole does and how it’s used
Omeprazole is a proton pump inhibitor that works by blocking the enzyme in the stomach lining that produces acid. Many bariatric clinics prescribe a short course as standard after sleeve surgery – sometimes four to six weeks, sometimes longer. If you’re experiencing significant reflux beyond that window, or if symptoms are getting worse, speak to your GP. Persistent reflux that doesn’t respond to PPIs warrants investigation – in some cases, revision to gastric bypass may eventually be considered.
One practical note: iron absorption can be slightly affected by PPIs over the long term, which is another reason to monitor blood levels regularly if you’re on them extended.
Dietary adjustments that help
Eating slowly and chewing thoroughly reduces the pressure build-up that triggers symptoms. Avoiding eating within two to three hours of lying down makes a significant difference – James noticed this consistently. Propping up the head of the bed slightly helps on difficult nights.
Common triggers include carbonated drinks, caffeine, tomato-based foods, citrus, spicy foods, fatty foods, and alcohol. The triggers are individual – you’ll learn yours over time. A brief food diary in the first few months helps identify patterns. Following the standard post-op rule of not drinking with meals reduces both reflux and dumping symptoms.
When to seek medical review
Occasional reflux managed by diet and medication doesn’t require urgent review. But some symptoms warrant prompt attention: reflux worsening despite omeprazole; difficulty or pain when swallowing; regular vomiting; significant chest pain (requires cardiac rule-out); or any signs of blood in vomit or stool.
The honest picture two years on
For James, reflux was one of the more uncomfortable early post-op experiences but it’s largely resolved. Omeprazole was a straightforward and effective intervention. If reflux is something you’re anxious about, the most useful thing is to be transparent with your bariatric team about the severity before surgery – it informs the sleeve versus bypass decision and shapes the post-op medication plan.
Sources cited in this post: NHS – Heartburn and acid reflux: causes, symptoms and treatment
NICE CG184 – Gastro-oesophageal reflux disease and dyspepsia in adults: investigation and management
BOMSS – Post-operative management guidelines for bariatric patients
Mechanick JI et al. – Clinical Practice Guidelines for the Perioperative Nutrition, Metabolic, and Nonsurgical Support of Patients Undergoing Bariatric Procedures (2019)
- NHS, “Weight loss surgery”: https://www.nhs.uk/conditions/weight-loss-surgery/
- British Obesity & Metabolic Surgery Society (BOMSS): https://bomss.org/
About this content
This blog is written by James and Kirsten, a couple from the UK who had gastric sleeve surgery together in March 2024.
We started this blog because we couldn't find any sources of content that details before surgery, the surgery and then life post surgery - so we decided to write one ourselves.
Everything on this site is based on our own experience and the research we have done along the way. It is not medical advice. Gastric sleeve surgery is a serious procedure and every patient's journey is different. Please always consult your own bariatric team or GP before making any decisions about your health or treatment.
Some posts on this site may contain featured or sponsored content, or affiliate links. Where this is the case, it will always be clearly stated at the top of the article. Our opinions are always our own.
Publish Date: 10 February 2026 | Last Reviewed: 27 June 2026 | Next Planned Review: 27 December 2027