H. pylori: The Stomach Bacteria Behind Most Ulcers

For most of medical history, peptic ulcers were thought to be caused by stress, spicy food, and excess stomach acid. Then, in 1982, two Australian physicians — Barry Marshall and Robin Warren — made a discovery that would win them the Nobel Prize: a spiral-shaped bacterium called Helicobacter pylori was living in the stomachs of ulcer patients and was directly responsible for the damage.

The medical world was skeptical. Marshall famously drank a solution containing H. pylori to prove his point, developed gastritis, and then cured himself with antibiotics. Today, H. pylori is recognized as the leading cause of peptic ulcers and a Group 1 carcinogen for gastric cancer.

How Common Is H. pylori?

Very common. H. pylori infects approximately 44% of the world's population — making it one of the most prevalent bacterial infections on earth. In the United States, prevalence is higher in certain communities, including immigrants from regions with poor sanitation, older adults, and populations with lower socioeconomic status. Most people who carry the bacteria have no symptoms and are unaware of the infection.

How Does It Cause Ulcers?

H. pylori lives in the mucous layer that coats the stomach lining. It produces enzymes that neutralize stomach acid locally, allowing it to survive. Over time, the bacteria triggers inflammation of the stomach lining (gastritis) and weakens the protective mucus barrier, allowing stomach acid to damage the underlying tissue — resulting in peptic ulcers of the stomach or duodenum.

Symptoms of H. pylori Infection

Many people with H. pylori have no symptoms at all. When symptoms occur, they typically include:

• Burning or gnawing stomach pain, especially when the stomach is empty (between meals or at night)

• Nausea and loss of appetite

• Frequent belching

• Bloating

More serious symptoms — vomiting blood, dark tarry stools, or severe sudden abdominal pain — suggest a bleeding or perforated ulcer and require immediate emergency care.

Testing for H. pylori

We offer urea breath testing in our offices — a non-invasive, highly accurate test that detects active H. pylori infection. You drink a small amount of urea solution and breathe into collection tubes; if H. pylori is present, it breaks down the urea and produces detectable carbon dioxide.

Other testing options include stool antigen testing, blood antibody testing, and biopsy during upper endoscopy. The choice of test depends on whether you've been treated before, whether you're currently on a PPI, and whether endoscopy is otherwise indicated.

Treatment and Why It Matters

H. pylori is treated with a combination of antibiotics and acid-suppressing medication — typically over 10–14 days. Antibiotic resistance is an increasing concern, and treatment regimens are chosen carefully based on local resistance patterns. Confirmation of cure with a follow-up breath test or stool antigen test is essential — we do not assume eradication without testing.

Eradicating H. pylori heals ulcers, prevents recurrence, and significantly reduces the risk of gastric cancer. Given its high prevalence and its role in gastric malignancy, we recommend testing for anyone with chronic unexplained stomach symptoms, a history of peptic ulcers, or a first-degree relative with gastric cancer.

📅 Think you might have H. pylori? Breath testing is available at our NJ offices. Call (908) 851-2770 or book online.

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Medical Disclaimer: This blog post is intended for general informational and educational purposes only and does not constitute medical advice.