Reflux after a gastric sleeve: why it happens, and what actually fixes it

You had a sleeve, you lost the weight, and now you cannot sleep flat. Or the reflux you had before surgery, which everyone said would improve when you lost weight, got worse instead.

This is one of the most common things patients come to see me about, and it is usually presented to them as bad luck. It is not bad luck. It is anatomy, it is predictable, and there is a specific order in which it should be worked up and treated.

How common is it, really

Common enough that it should be part of the consent conversation before a sleeve, not a surprise after it.

• ◆ Among patients who had no reflux symptoms before a sleeve, roughly 10 to 15% develop them afterward, and about 2% ultimately need revisional surgery for it.
• ◆ Across long-term studies, reflux symptoms, erosive esophagitis, hiatal hernia and proton pump inhibitor use all rise roughly two to three and a half fold compared with before surgery.
• ◆ In one multicenter cohort followed a median of about six and a half years with systematic endoscopy, reflux symptoms rose from 22% to 76% and erosive esophagitis from 10% to 41%.

Sources: Qumseya BJ, et al. Gastrointest Endosc. 2021;93(2):343-352 (meta-analysis, 680 post-sleeve endoscopies); Chandan S, et al. Clin Gastroenterol Hepatol. 2025;23(1):33-44.e10 (19 studies, 2,046 patients); Sebastianelli L, et al. Obes Surg. 2019;29(5):1462-1469.

Barrett's esophagus, in which chronic acid exposure changes the lining of the lower esophagus, is the outcome that matters most, and here the literature is genuinely inconsistent. Reported rates after sleeve range from about 4% in one prospective cohort followed a median of nine years, to 5.6% and 11.4% in two separate meta-analyses, to 18.8% in the multicenter series above, with at least one endoscopic follow-up study finding none at all. Anyone who quotes you a single confident figure for Barrett's after sleeve is overstating the evidence. The honest summary is that the risk is real, it is not small, and it rises with time since surgery.

Why the operation causes it

A sleeve removes roughly 80% of the stomach, including the fundus, and that changes several things at once at the junction between esophagus and stomach.

• ◆ The angle of His, the acute angle where the esophagus meets the stomach that acts as a mechanical flap valve, is flattened when the fundus is removed.
• ◆ The sling fibers that help the lower esophageal sphincter cinch closed are divided during the resection.
• ◆ Pressure inside the remaining stomach rises, because a narrow tube with much less capacity to stretch generates higher pressure for the same volume. That pressure pushes contents upward.
• ◆ A hiatal hernia, whether missed at the original operation or developed since, lets the gastric tube slide into the chest and defeats what valve mechanism remains.
• ◆ Technical factors: a twist, kink or narrowing in the sleeve, or a retained portion of fundus, each of which creates a functional obstruction that drives reflux.

Mechanism summary follows Serra FE, Cohen RV. Gastroesophageal reflux disease after sleeve gastrectomy. Dig Med Res. 2024;7:5.

Notice that most of these are structural. That is why reflux after a sleeve so often does not respond fully to acid suppression: the acid is a symptom of a mechanical problem, and you cannot medicate an anatomic defect into behaving.

What the guidelines actually say, including one recommendation almost nobody follows

Two clarifications, because both are commonly misstated.

First, a sleeve is not formally contraindicated in patients with reflux. The ASMBS position is preferential rather than prohibitive: patients with objective evidence of significant preoperative reflux, meaning Los Angeles grade C or D esophagitis on endoscopy or acid exposure time above 6% on pH testing, or severe symptoms, are "better served by current techniques of Roux-en-Y gastric bypass rather than sleeve gastrectomy." That is a strong steer, and in my practice it decides the operation. But it is a recommendation about which procedure to choose, not a ban.

Second, and more actionable if you have already had a sleeve: ASMBS recommends a screening endoscopy in all patients three or more years after a sleeve, whether or not they have symptoms, and then reasonably every five years if the first one is normal. This recommendation is widely unmet. If you are four years out from a sleeve and have never had a scope, you are the patient it was written for.

Source: Campos GM, Mazzini GS, Altieri MS, et al. ASMBS position statement on the rationale for performance of upper gastrointestinal endoscopy before and after metabolic and bariatric surgery. Surg Obes Relat Dis. 2021;17:837-847.

One detail makes that surveillance point sharper. In a prospective cohort scoped a median of nine years after sleeve, 40% of patients had biopsy-proven esophagitis despite an endoscopy that looked normal. The lesson for whoever performs your scope is to take biopsies rather than simply look and reassure.

The right order of workup

Reflux after a sleeve is where a lot of care goes sideways, usually by jumping from symptoms straight to a proposed operation, or by leaving a patient on a proton pump inhibitor for six years without ever looking. The sequence that makes sense is unglamorous.

• ◆ Start with acid suppression and give it a fair trial. Many patients are adequately controlled and need nothing further, just surveillance.
• ◆ If symptoms are refractory, get the full picture before discussing surgery: an upper endoscopy with biopsies, pH testing off medication, esophageal manometry, and a contrast study to see the shape of the sleeve. pH testing can be skipped when the endoscopy already shows grade C or D esophagitis or Barrett's, because the diagnosis is no longer in question.
• ◆ The manometry is not optional box-checking. It tells us whether the esophagus still squeezes normally, which changes what operation is safe to offer.
• ◆ If a hiatal hernia is present, it gets repaired. That alone resolves a meaningful share of cases.

Why fundoplication is off the table, and what replaces it

For reflux in a patient who has never had bariatric surgery, a Nissen or Toupet fundoplication is the durable surgical answer: the surgeon wraps the top of the stomach around the lower esophagus to rebuild the valve.

After a sleeve, that operation is not possible. The fundus, the part of the stomach used to construct the wrap, is precisely what was removed and sent to pathology. There is no tissue to wrap. Any clinic offering you a fundoplication after a sleeve has not understood your anatomy.

The standard definitive answer is conversion to a Roux-en-Y gastric bypass, which removes acid production from the equation by rerouting the anatomy rather than trying to rebuild a valve. It also usually helps with weight, which matters for patients who have regained.

The results are good but not perfect, and you deserve the unvarnished version. In a comparative series, conversion to Roux-en-Y resolved reflux in about 92% of patients, better than conversion to a one-anastomosis bypass at about 77%. But in another cohort, while about 80% reported meaningfully better symptoms, only about 19% came off acid medication entirely, and roughly 28% still had some reflux afterward. Revisional surgery also carries more risk than a first operation: pooled complication rates run about 16% within 30 days and about 11% after. Individual results vary.

Sources: Dayan D, et al. Obes Surg. 2023;33(7):2125-2131; Matar R, et al. Obes Surg. 2021;31(9):3936-3946; Jefferies RS, Leeds SG, Ward MA. Ann Laparosc Endosc Surg. 2024;9:35; Serra FE, Cohen RV. Dig Med Res. 2024;7:5.

Reflux is the stated reason for about 30% of all sleeve-to-bypass conversions, so this is a well-travelled path, not an exotic one. For the narrower group with a normal BMI who do not want or need a bypass, magnetic sphincter augmentation is a considered option, with reasonable symptom control but a real recurrence rate. It is a discussion, not a default.

If you are still deciding on a sleeve

Get your reflux assessed honestly first. Routine endoscopy before every bariatric operation is debated, and reasonably so: across 25 studies and more than 10,000 patients, about 56% of preoperative scopes were entirely normal, 16% found something that changed or delayed the operation, and only 0.4% found an absolute contraindication. ASMBS leaves it to surgeon discretion.

But if you have real reflux symptoms, the calculus changes, and a scope before surgery is how you avoid choosing the one operation most likely to make your worst symptom permanent. A sleeve is an excellent operation for the right patient. For a patient with grade C esophagitis, it is the wrong one, and finding that out afterward costs a second surgery.

Why this particular problem needs one surgeon, not two

Reflux after a sleeve sits exactly on the line between two specialties. Most bariatric surgeons do not do complex antireflux work, and most foregut surgeons do not do revisional bariatric surgery, so patients get passed back and forth while the acid keeps working on their esophagus.

Dr. Eduardo is fellowship-trained in both. He performs the sleeves and bypasses, and he performs the antireflux and hiatal hernia operations, which means one person can order the right workup, read it, and do whichever operation the results actually point to. That is the whole argument, and it is the reason this page exists.

The bottom line

New or worsening reflux after a sleeve is common, mechanical, and fixable. If you are more than three years out from a sleeve, you should have an endoscopy with biopsies whether or not you have symptoms. If you have symptoms that a proton pump inhibitor is not controlling, you need a complete workup before anyone proposes an operation, and the operation that follows will be a hiatal hernia repair or a conversion to gastric bypass, not a fundoplication. Bring your prior operative report if you have it, and we will start from what was actually done.