From reflux to esophageal cancer: the Barrett’s connection, and how to lower your risk

Heartburn is so common that it’s easy to shrug off. But for a small number of people, years of untreated reflux set off a chain of changes in the esophagus that can end in cancer. I want to walk through that pathway plainly — not to alarm you, but because this is one of the few cancers where understanding the cause hands you real ways to lower your risk.

A cancer that has changed

Esophageal cancer isn’t what it was a generation ago. There are two main types. Squamous cell carcinoma, historically the most common, is linked mainly to smoking and alcohol — and in Canada it has been declining. Adenocarcinoma, which arises in the lower esophagus and is closely tied to chronic acid reflux, has risen sharply over recent decades. Today, adenocarcinoma is the most common type of esophageal cancer in Canada.¹ That shift — from a smoking-and-alcohol disease to a reflux disease — is one of the most striking changes I’ve seen in my field, and it’s exactly why reflux deserves to be taken seriously.

The reflux-to-cancer pathway

The progression is gradual and well understood — which is precisely what makes it possible to interrupt. In simple terms, it moves through four steps:

1. Chronic reflux (GERD). Repeated exposure of the lower esophagus to stomach acid inflames and injures the lining.
2. Barrett’s esophagus. Over time, the normal lining can be replaced by a different, intestinal-type lining — a change called metaplasia. This is Barrett’s esophagus.
3. Dysplasia. In some people, the Barrett’s lining starts to develop abnormal cells — first low-grade, then high-grade dysplasia.
4. Adenocarcinoma. High-grade dysplasia can, if left unchecked, progress to cancer.

Two things are worth holding onto. First, this usually unfolds slowly, over years. Second, only a minority of people with reflux ever develop Barrett’s, and only a minority with Barrett’s ever progress to cancer. But because the steps are predictable, we can watch for them and step in early.

Why controlling reflux matters

If reflux is the engine of this process, controlling reflux is the brake — and it’s the single most important thing most people can do. It works on two fronts: lifestyle and medication.

Dietary and lifestyle steps

These are the changes I most often recommend to bring reflux under control:

• Eat smaller, more frequent meals instead of large ones.
• Ease off common triggers: fried and fatty foods, chocolate, peppermint, caffeine (coffee and tea), carbonated drinks, alcohol, spicy foods, and acidic foods like citrus and tomato-based sauces.
• Don’t lie down within about three hours of eating, and avoid late-night meals.
• Raise the head of your bed if reflux troubles you at night.
• Lose excess weight — extra weight around the abdomen pushes acid upward.
• Limit alcohol and stop smoking.
• Avoid tight clothing around the waist.

None of these is dramatic on its own, but together they make a real difference.

Acid-reducing medication (PPIs)

For many people, diet and lifestyle aren’t enough on their own, and medication has a role. Proton pump inhibitors (PPIs) reduce the amount of acid the stomach makes, which controls reflux symptoms and calms the inflammation that drives these changes. In people who already have Barrett’s, there is evidence that ongoing acid suppression can reduce the chance of progression.³ PPIs should be used under your doctor’s guidance — the goal is genuine reflux control, not simply masking symptoms.

If you have Barrett’s esophagus

Being told you have Barrett’s is not a diagnosis of cancer — most people with it never develop one. What it does mean is that you benefit from a plan: controlling your reflux, and periodic monitoring with endoscopy so that any early changes are caught.² And here is the genuinely reassuring part — when dysplasia is found, it can very often be treated directly through the endoscope, removing or ablating the abnormal lining, before it ever becomes cancer. That is the whole point of monitoring: to act early, while the problem is still easy to fix.

When surgery comes in

If an adenocarcinoma does develop, catching it early changes everything. Early esophageal cancers can be treated definitively, and where appropriate I perform esophagectomy using minimally invasive techniques. But the best outcome of all is the one where we control the reflux, monitor the Barrett’s, and never let it get that far. You can read more about the surgery on the esophageal cancer page, and about reflux and hiatus hernia in this related article.

Dr. Kashif Irshad, MD, MSc, FRCSCThoracic & benign esophageal surgeon. This article is general information, medically reviewed September 2026. About Dr. Irshad →