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Procedure Guide

Gastric Bypass for GERD: Why It Works

For patients with both obesity and chronic GERD, Roux-en-Y gastric bypass is the gold-standard surgical solution. It addresses both conditions in a single operation — and provides reflux relief that no other bariatric procedure matches.

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Why Bypass Anatomy Controls Reflux

The Roux-en-Y gastric bypass is uniquely effective for GERD because it changes the physiology of acid production AND the path of digestive flow. The newly created gastric pouch is small and produces very little acid. The digestive flow is rerouted through the Roux limb, so any acid that does form drains away from the esophagus rather than upward toward it.

For patients with both obesity and reflux, this is a two-for-one operation: durable bariatric weight loss AND lasting GERD relief — without the need for chronic acid-suppressing medication or fundoplication.

Roux-en-Y gastric bypass anatomy showing how the reroute keeps acid away from the esophagus
Roux-en-Y bypass anatomy — the small pouch and rerouted flow prevent acid from reaching the esophagus.

What the Evidence Shows

85–95% reflux resolution rateLong-term studies show most GERD patients see significant or complete relief after bypass.
PPI discontinuationMost patients can stop taking proton pump inhibitors within 4–6 weeks of surgery.
Esophagitis healingEndoscopic esophagitis often resolves completely after bypass.
Durable weight lossAverage 60–80% excess weight loss at one year after surgery.

Bypass for GERD Relief?

Get a personalized medical evaluation from Dr. Alejandro López and our bariatric team.

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Over 20,000 procedures performed · 20+ years experience · Board-Certified Bariatric Surgeons

Who Is a Good Candidate?

  • BMI ≥ 35 or BMI ≥ 30 with weight-related comorbidities
  • Chronic GERD symptoms despite medical therapy
  • Endoscopic findings of esophagitis, ulceration, or Barrett's esophagus
  • Prior sleeve gastrectomy with reflux relapse (sleeve-to-bypass conversion)
  • Prior fundoplication with weight regain (specialized revision available)

Had a Nissen fundoplication and regained weight? Dr. Alejandro López performs a single-stage operation that takes down the prior fundoplication and converts the anatomy to a Roux-en-Y gastric bypass, treating the reflux relapse and the obesity together. Learn about fundoplication revision to bypass →

Medical consultation with Dr. Alejandro López for gastric bypass GERD evaluation
Dr. Alejandro López evaluates each candidate personally before recommending bypass for GERD.

Meet Your Surgeon — Dr. Alejandro López

Dr. Alejandro López — Bariatric and Antireflux Surgeon at ALO Bariatrics

Dr. Alejandro López, MD, FACS

Bariatric and Antireflux Surgeon
  • Fellow of the American College of Surgeons (FACS)
  • 20,000+ bariatric and antireflux procedures performed
  • Specialized in Roux-en-Y bypass for obesity + GERD
  • Member of ASMBS, IFSO, and CMCOEM
  • Premium hospitals in Tijuana, Guadalajara, and Puerto Vallarta

Frequently Asked Questions

Why is gastric bypass considered the gold standard for GERD?
Multiple long-term studies show 85-95% of patients with GERD see significant or complete resolution after Roux-en-Y gastric bypass. The bypass anatomy itself controls reflux — no medication, no fundoplication wrap required.
I don't need to lose much weight. Can I still have bypass for reflux?
Generally, bariatric surgery (including bypass) requires a BMI of at least 30 with comorbidities, or 35 without. For patients with lower BMI seeking pure antireflux surgery, fundoplication or magnetic sphincter augmentation may be more appropriate. Dr. Alejandro López evaluates each case individually.
How quickly will my reflux improve after bypass?
Most patients notice substantial improvement within days. By 4-6 weeks post-op, most can stop taking PPIs entirely.
What if I already had a sleeve and have GERD?
You may be a candidate for sleeve-to-bypass conversion — a single-stage procedure that addresses both the reflux and continued weight loss. See our sleeve to bypass for reflux page.
Can the bypass be combined with hiatal hernia repair?
Yes, and Dr. Alejandro López routinely repairs any hiatal hernia at the time of bypass surgery. This is essential for the best long-term reflux control.
What is the recovery like?
Hospital stay 2 nights. Return to light activities within 1 week, full activities within 2-3 weeks. Liquid diet for 2 weeks transitioning to soft foods.

Find Out If Bypass Is Right for You

Dr. Alejandro López personally reviews each evaluation — including your current symptoms, BMI, prior surgeries, and imaging — to confirm whether Roux-en-Y bypass is the right solution for your reflux.

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