H. pylori and Acid Reflux: The Stomach Bacteria Most People Never Get Tested For

Quick answer: H. pylori is a spiral-shaped bacterium that colonizes the stomach lining, and it lives in roughly 43% of people worldwide. Most carriers have no symptoms and are never tested. Its relationship with reflux is not a straight line. Depending on where in the stomach it settles, H. pylori can raise stomach acid or lower it, and it can drive the gastritis and upper-belly burning that gets mistaken for reflux. Knowing whether you carry it, and which strain, changes what your next step should be.

If you have cut out the coffee, moved dinner earlier, raised the head of your bed, and worked on your nervous system for months, and your symptoms still will not settle, that frustration is valid. You are not doing it wrong. Sometimes there is a piece of the picture that behavior change alone cannot reach, and it will not show up until someone actually looks.

H. pylori is one of those pieces. It is also one of the few root contributors in reflux that we can test for directly.

What H. pylori Actually Is

H. pylori is a spiral-shaped bacterium that has adapted to survive in the harshest environment in your body: the acid of your stomach. Most people acquire it in childhood, usually from family members or shared utensils, and then carry it quietly for decades.

Quietly is the key word. The majority of carriers never develop symptoms, which is exactly why so few people are ever tested for it.

The numbers are larger than most people expect. In a systematic review and meta-analysis of 224 studies covering 2,979,179 individuals across 71 countries, the estimated global prevalence of H. pylori fell from 58.2% in 1980 to 1990 down to 43.1% in 2011 to 2022 (Li et al., 2023, The Lancet Gastroenterology and Hepatology 8(6):553-564, PMID 37086739, DOI). An earlier analysis put the total at roughly 4.4 billion people carrying it in 2015 (Hooi et al., 2017, Gastroenterology 153(2):420-429, PMID 28456631, DOI).

Prevalence is lower in high-income countries and in younger age groups. It is still common enough that in any room of reflux patients, a meaningful number are carrying it and have no idea.

Does H. pylori Cause Acid Reflux?

Here is where I want to be careful with you, because the honest answer is more interesting than a yes or no. H. pylori changes the acid environment of your stomach, and the direction it changes depends on where the bacterium sets up.

Antrum-predominant gastritis. When inflammation concentrates in the lower stomach, acid output tends to go up. This pattern is associated with duodenal ulcers, and in these cases, treating H. pylori often improves existing reflux esophagitis.

Corpus-predominant gastritis. When inflammation concentrates in the upper stomach, the acid-producing tissue itself is damaged and acid output tends to go down. Over years this can progress to atrophic gastritis, a low-acid state that appears to be somewhat protective against reflux esophagitis. In this pattern, reflux symptoms sometimes appear after H. pylori is treated (Yucel, 2018, Esophagus 16(1):52-62, PMID 30151653, DOI).

Read that second one again, because it matters. Clearing H. pylori can unmask reflux in some people rather than resolve it. That is not a reason to leave it alone. H. pylori is a recognized risk factor for gastric cancer, and treatment decisions belong to you and your physician. It is a reason to know what you are dealing with before you start, so nobody is surprised by what happens next.

There is a third pathway worth naming, and it is the one I see most often in practice. H. pylori is a driver of chronic gastritis and functional dyspepsia, which produce upper-belly burning, fullness, early satiety, and nausea. Those symptoms overlap heavily with what people describe as reflux. When someone tells me their "reflux" feels like a burning stomach rather than a burning chest or throat, gastritis is on my list.

Why the Strain Matters More Than the Diagnosis

Two people can both carry H. pylori and face very different risks, because H. pylori strains are not equivalent.

The two most studied virulence factors are cagA and vacA. Strains carrying these genes provoke more aggressive inflammation and are linked to more severe clinical outcomes (Sharndama and Mba, 2022, Brazilian Journal of Microbiology 53(1):33-50, PMID 34988937, DOI). In the reflux conversation specifically, cagA-positive strains are the ones associated with pangastritis and gastric atrophy, the corpus-predominant pattern described above (Yucel, 2018, PMID 30151653).

Strain status also carries treatment implications. A systematic review and meta-analysis found cagA-positive strains showed higher resistance to metronidazole, and vacA genotype was associated with meaningful differences in antibiotic resistance patterns (Karbalaei et al., 2022, BMC Infectious Diseases 22(1):573, PMID 35752757, DOI).

So "I have H. pylori" and "I have a cagA-positive strain" are two different pieces of information. The second is far more useful to whoever is building your plan.

What Food and Supplements Can and Cannot Do

I want to give you the real version here, because there is a lot of confident misinformation on this topic.

Sulforaphane from broccoli sprouts. In a double-blind randomized controlled trial of 89 participants, broccoli sprout extract containing sulforaphane did not reduce H. pylori infection density measured by urea breath test. What it did do was significantly reduce malondialdehyde in the gastric mucosa, a marker of oxidative damage to the stomach lining, suggesting a cytoprotective role in H. pylori-induced gastritis (Chang et al., 2015, Gut and Liver 9(4):486-493, PMID 25287166, DOI).

In plain language: broccoli sprouts appear to help protect the tissue. They do not clear the bacterium. That is still worth something, because protecting an irritated stomach lining is real work. It is just not eradication.

Probiotics. In a meta-analysis of 9 randomized controlled trials with 1,163 patients, adding a Lactobacillus-containing probiotic to standard eradication therapy significantly raised eradication rates (RR 1.14, 95% CI 1.06 to 1.22, number needed to treat 10). Lactobacillus given on its own alongside therapy performed better still, raising eradication by 17%. Notably, overall side effects were not significantly reduced in this adult analysis (Zheng et al., 2013, Revista Espanola de Enfermedades Digestivas 105(8):445-453, PMID 24274441, DOI).

A separate network meta-analysis of 29 trials and 3,122 participants, this one in children, found probiotic-supplemented triple therapy both raised eradication rates (RR 1.19) and reduced total side effects (RR 0.49), with specific strains outperforming others (Feng et al., 2017, European Journal of Clinical Pharmacology 73(10):1199-1208, PMID 28681177, DOI).

The honest summary: probiotics are a useful adjunct to a medical protocol. They are not a replacement for one.

The part I will not soften. Clearing an active H. pylori infection calls for a specific medical protocol, most often antibiotics, prescribed and monitored by your provider. No food, no supplement, and no elimination diet does that job.

Where food and supplements earn their place is everything around that: protecting the mucosa, supporting the microbiome through treatment, and rebuilding the barrier afterward. That work is real, and it is the work I do with clients.

How to Find Out If H. pylori Is Part of Your Picture

You cannot reason your way to this answer. You have to look.

In my practice, the tool I use is a GI-MAP, a detailed stool test that reads H. pylori along with virulence factor genes including cagA and vacA. It reads a great deal more than that too: beneficial and opportunistic bacteria, yeast and fungal overgrowth, parasites, markers of inflammation in the gut lining, and how well you are actually digesting and absorbing your food.

A population average points you in a direction. This gives you your own map.

But a test is only as good as what somebody does with it, which is why I built the whole arc around it rather than just selling a panel. The Microbiome Mapincludes:

• The GI-MAP stool test ($463 lab value), shipped to your door

• Full clinical interpretation by a registered dietitian who reads every marker, not a software summary

• A 60-minute roadmap session to walk through your results in plain English

• A written, personalized protocol phased over about 12 weeks: what to eat, what to take, what to change, and in what order

• 30 days of messaging support while you get started

• A 30-minute follow-up to adjust what is not working

It is application only, and I read every application myself. A GI-MAP is powerful when it is the right tool and a waste of money when it is not. If it is not your best next step, I will tell you that, and tell you what I would do instead, before you spend a dollar.

Apply for The Microbiome Map. It takes about five minutes and you will hear back within three business days either way. (Due to lab regulations, this program is not available to residents of New York State.)

Frequently Asked Questions

Does H. pylori cause acid reflux?

Not in a simple one-to-one way. H. pylori changes stomach acid output, and the direction depends on where the inflammation sits. Antrum-predominant gastritis tends to raise acid, while corpus-predominant gastritis lowers it and can even be somewhat protective against reflux esophagitis (Yucel, 2018, PMID 30151653). It also causes gastritis and functional dyspepsia, which produce burning and fullness that people often describe as reflux.

What are the symptoms of H. pylori?

Most carriers have none. When symptoms do appear, they commonly include upper-belly burning, fullness after small amounts of food, early satiety, nausea, and bloating. Ulcer symptoms are the more severe end. Because the symptom picture overlaps so heavily with reflux and dyspepsia, testing is the only way to know.

Can H. pylori go away on its own?

Untreated H. pylori generally persists for decades. Clearing an active infection typically requires a specific antibiotic protocol guided by your physician. Diet and supplements support the tissue and the microbiome around that protocol rather than replacing it.

Do I need to know my H. pylori strain?

It is useful. cagA and vacA status is associated with more aggressive inflammation, different clinical outcomes, and different antibiotic resistance patterns (Karbalaei et al., 2022, PMID 35752757). Knowing the strain gives your provider more to work with than a positive or negative alone.

Should I take probiotics for H. pylori?

Alongside a medical eradication protocol, the evidence supports it. Lactobacillus-containing probiotics significantly raised eradication rates in a meta-analysis of 9 RCTs and 1,163 patients (Zheng et al., 2013, PMID 24274441). As a standalone treatment, no.

About Molly Pelletier, MS, RD

Molly Pelletier is a registered dietitian known as The Reflux Dietitian and the founder of FLORA Nutrition. After healing her own reflux, she built her practice around the mechanisms behind GERD and LPR so people can understand what is actually happening in their bodies. Meet Molly.

If you have been doing the work and still feel like you are missing a piece, a map might be it.

you are loved.