Gastritis and Stomach Ulcers: Symptoms, Causes, and the Tests That Confirm Them

Gastritis is inflammation of the stomach lining. A stomach ulcer is a step further: an actual open sore that forms in that lining or in the upper part of the small intestine, once inflammation has worn the protective layer thin enough for acid to reach the tissue underneath.

In practice, the two conditions sit on the same spectrum rather than as separate problems. Prolonged, untreated gastritis is one of the most common paths to an ulcer.

The mechanism behind most cases is the same too.

The stomach lining is normally shielded by a thick layer of mucus that keeps digestive acid from damaging the tissue beneath it. When something breaks that barrier down, most often an H. pylori infection, but also long-term NSAID use, heavy alcohol intake, or acute physiological stress, the lining becomes irritated and inflamed.

If the irritation continues unaddressed, acid begins to erode the weakened tissue directly, and that's when an ulcer forms.

This is exactly why doctors rarely diagnose either condition on symptoms alone. Gastritis and ulcers can look identical from the outside: similar pain, similar triggers, similar timing, while requiring different levels of clinical attention.

Testing is what tells them apart, and it's also what determines whether the underlying cause is an active infection, years of chronic irritation, or something that needs a closer look via endoscopy.

Typical gastritis symptoms include upper abdominal pain, nausea, vomiting, bloating, indigestion, loss of appetite, and heartburn.

Ulcer pain tends to be more specific: a gnawing or burning sensation between the breastbone and navel that often shows up between meals or in the early hours of the morning, and may briefly ease with food or antacids.

It's worth knowing that a large share of people with the underlying infection never develop noticeable symptoms at all, which is one reason gastritis can go undetected for years.

H pylori infection is the single most common cause of both gastritis and peptic ulcers worldwide. This bacterium survives the stomach's acidic environment by producing enzymes that neutralise acid around it, then burrows into the stomach lining, weakening its protective mucus layer and triggering chronic inflammation.

Other contributors include long-term NSAID use, heavy alcohol consumption, and acute physiological stress, such as severe illness or injury.

Quick clarity: in practice, this means most people carrying H. pylori will never know it. Only about 1 in 5 infected people ever develop symptoms, which is exactly why testing matters more than waiting for pain to show up.

When gastritis or an ulcer is suspected, doctors typically reach for one of four main stomach ulcer test options, chosen based on symptoms, urgency, and whether repeat testing is needed.

Breath Test

The urea breath test is the most commonly used H. pylori test. It measures carbon dioxide in your breath after drinking a urea-based solution. Since H. pylori breaks urea down into carbon dioxide, an elevated reading signals active infection.

Stool Antigen Test

This test checks a stool sample for H. pylori antigens and, like the breath test, is a reliable way to confirm an active, current infection rather than a past one.

Blood Test

A blood test looks for H. pylori antibodies, but it has one key limitation: it can't distinguish between a current infection and one that was already treated, since antibodies can linger

after the bacteria is gone.

Endoscopy With Biopsy

Endoscopy involves passing a thin camera into the stomach to directly examine the lining, often combined with a tissue biopsy for lab analysis. It's the most definitive stomach ulcer test, typically reserved for more severe symptoms or when other tests need confirmation.

Unlike H. pylori tests, a pepsinogen blood test doesn't check for the bacteria directly. It measures pepsinogen I and pepsinogen II, proteins produced by the stomach lining, and calculates their ratio to assess how much long-term damage the lining has sustained.

A low pepsinogen I level combined with a low PG I/PG II ratio (commonly a ratio below 3) is associated with atrophic gastritis, a more advanced, longer-standing form of stomach lining thinning.

Research shows the pepsinogen test carries high specificity for atrophic gastritis, making it a useful non-invasive screening tool, particularly when endoscopy isn't immediately available or practical.

Each test answers a slightly different question, which is why doctors sometimes order more than one.

Gastritis is one of the most commonly self-treated conditions among working adults. Antacids are reached for long before a test is, and by the time symptoms are disruptive enough to prompt a doctor visit, the underlying cause (an active H. pylori infection versus years of chronic lining damage) is often still unclear without proper testing.

Diagnostics: 8,500+ NABL-Accredited Labs

Employees can book a breath test, stool antigen test, blood test, or pepsinogen test cashlessly through Visit Health's diagnostic network, with both home sample collection and in-centre visits available depending on convenience. Results are tracked digitally through the app without requiring physical report collection.

Teleconsultation: Gastroenterology and Internal Medicine Specialists

Persistent gastritis symptoms, a positive H. pylori test, or a low pepsinogen I/II ratio all warrant a proper clinical review rather than continued self-medication. Visit Health's teleconsultation platform connects employees with gastroenterologists and internal medicine specialists across 30-plus specialities, with general physician consultations typically available within 15 minutes and specialist consultations within 60 minutes.

AI-Powered Smart Reports

A pepsinogen ratio or an H. pylori test result on its own rarely means much to a patient reading it cold. Visit Health's Smart Reports convert these lab values into plain-language summaries, explaining what the numbers indicate and what the recommended next step is, while also tracking results over time to flag any downward trend in the pepsinogen ratio.

Visit Clinic: In-Person Care in Bengaluru

For employees near the Marathahalli Hub who need an in-person consultation, endoscopy referral, or follow-up after an abnormal test result, Visit Clinic provides on-ground appointments connected into the broader specialist and diagnostic ecosystem, useful for cases where symptoms persist despite treatment or where a doctor recommends direct examination.

What are the early warning gastritis symptoms? 

Early gastritis symptoms typically include upper abdominal pain, bloating, nausea, indigestion, and loss of appetite, though many people have no symptoms at all.

Is H. pylori the main cause of stomach ulcers? 

Yes, H pylori infection is the leading cause of stomach ulcers worldwide, though long-term NSAID use is another common contributor.

What is a pepsinogen test used for? 

It's used to screen for long-term stomach lining damage, particularly atrophic gastritis, by measuring pepsinogen I and II levels and their ratio.

Which stomach ulcer test is most accurate? 

Endoscopy with biopsy is considered the most definitive stomach ulcer test, since it allows direct visual examination and tissue sampling.

Can gastritis go away without treatment? 

Some cases resolve on their own, but gastritis caused by H. pylori typically requires antibiotic treatment to fully clear the infection and prevent complications.

Do I need to fast before an H. pylori breath test? 

Yes, most breath tests require fasting for a few hours beforehand, and antibiotics or acid-reducing medications may need to be paused first. Check with your doctor.

Is a low pepsinogen I/II ratio serious? 

A low ratio suggests atrophic gastritis, a more advanced stage of stomach lining changes, and generally warrants further discussion with a doctor about monitoring or additional testing.

Book a pepsinogen test or H. pylori test at a trusted diagnostic centre for accurate gastritis and ulcer evaluation. Find nearby labs and schedule your test easily with Visit Health.