Yes, H. pylori is a well-established cause of indigestion. This stomach bacterium infects roughly half the world’s population, and among those who test positive, the vast majority experience classic indigestion symptoms: epigastric pain (86%), bloating and gas (83%), frequent burping (98%), and nausea (61%). But the relationship between infection and symptoms is more nuanced than it first appears, and clearing the bacteria doesn’t guarantee relief for everyone.
How H. Pylori Disrupts Your Stomach
H. pylori burrows into the mucus lining that protects your stomach wall from its own acid. Once established, it triggers a chain of changes that directly produce indigestion symptoms.
The bacterium causes chronic inflammation in the stomach lining, which weakens two key defenses: the mucus layer and the bicarbonate your stomach produces to neutralize acid near the wall. At the same time, the infection increases levels of gastrin, a hormone that tells your stomach to produce more acid. So you end up with more acid hitting a less-protected stomach wall. That combination creates the burning, gnawing upper-belly pain that most people recognize as indigestion.
The inflammation also disrupts how your stomach contracts and empties food. When your stomach doesn’t move food along efficiently, it sits longer than it should, producing the bloating, fullness, and burping that are hallmarks of H. pylori-related indigestion. These aren’t vague or minor symptoms. In one hospital study of infected patients, nearly all reported frequent burping, and more than 8 in 10 had significant bloating.
Indigestion Without an Ulcer
Many people assume H. pylori only matters if it causes an ulcer. That’s not the case. A large portion of people with H. pylori have what’s called functional dyspepsia, meaning they have persistent indigestion symptoms without a visible ulcer or other structural problem. The inflammation and acid changes the bacterium causes are enough on their own to produce daily discomfort.
That said, not everyone infected with H. pylori develops symptoms. Some people carry the bacterium for years without noticeable problems. Why some people get indigestion and others don’t likely comes down to differences in the bacterial strain, the person’s immune response, and other individual factors like diet and stress. But when someone does have unexplained, recurring indigestion, H. pylori is one of the first things worth testing for.
How Testing Works
The most accurate non-invasive test is the urea breath test, which has a sensitivity of 98.9% and specificity of 99.5%. You drink a solution containing a tagged form of urea, and if H. pylori is present, the bacteria break it down in a way that’s detectable in your breath about 15 to 30 minutes later. It’s quick, painless, and highly reliable.
A stool antigen test is another option, though it’s somewhat less accurate. Newer monoclonal versions of this test reach about 88% sensitivity and 95% specificity, while older polyclonal versions drop to around 73% sensitivity. If precision matters (and it does when you’re deciding whether to take a course of antibiotics), the breath test is the stronger choice.
One important detail: if you’re currently taking a proton pump inhibitor (a common acid-reducing medication like omeprazole or lansoprazole), you need to stop it at least two weeks before testing. PPIs suppress the bacteria enough to produce false-negative results, meaning the test says you’re clear when you’re not. You also need to avoid antibiotics for any reason in the four weeks before testing, since they can temporarily knock the bacteria down without fully eliminating it.
What Happens After Treatment
Standard treatment involves a combination of antibiotics and an acid-suppressing medication taken over one to two weeks. The goal is full eradication of the bacteria, and when treatment works, the stomach inflammation gradually resolves and acid production normalizes.
Here’s where expectations need to be realistic. A large review of 12 clinical trials found that clearing H. pylori does improve indigestion symptoms, but the benefit is modest. About 65% of people who received eradication therapy still had symptoms the same or worse afterward, compared to 71% on placebo. That translates to a number needed to treat of 17, meaning for every 17 people treated, one additional person gets meaningful symptom relief beyond what a placebo would provide.
Those numbers can feel discouraging, but context matters. For some people, eradication leads to complete resolution of symptoms that lasted years. For others, the indigestion has multiple contributing factors, and removing H. pylori is only part of the solution. Ongoing inflammation can take weeks or months to fully heal even after the bacteria are gone. And in some cases, the stomach’s motility patterns have been disrupted long enough that they don’t snap back immediately.
Why Symptoms Sometimes Persist
If your indigestion continues after successful H. pylori treatment, it doesn’t mean the diagnosis was wrong. Long-standing infection can leave behind changes in how your stomach processes food and responds to acid. The nerve signals between your gut and brain may have become sensitized during months or years of inflammation, making your stomach more reactive to normal amounts of acid and stretching.
Other factors can also layer on top of or mimic H. pylori-related indigestion. Eating habits, stress, caffeine, alcohol, and certain medications (especially anti-inflammatory painkillers) all affect stomach acid and motility. Addressing these alongside bacterial eradication gives you the best chance of lasting relief. For people whose symptoms do improve after treatment, the change typically becomes noticeable within a few weeks to a couple of months as the stomach lining heals.