H. pylori, Ulcers, and Stomach Cancer Risk in Black Adults

Helicobacter pylori is a common stomach bacterium, and in Black adults it is about twice as common as in white adults. It is the main cause of stomach ulcers and the single biggest known risk factor for stomach (gastric) cancer, a cancer that kills Black Americans at two to three times the rate of white Americans. Most people who carry it feel nothing for years. That is exactly why a one-time test matters, especially if you have stomach pain or a family history of ulcers or stomach cancer.

H. pylori is a spiral-shaped bacterium that lives in the lining of the stomach. Most people pick it up in childhood, often through close household contact, and it can stay for life without causing symptoms. Roughly two-thirds of the world carries it. In the United States, the burden is not spread evenly. In national NHANES survey data from 1999 to 2000, about 52% of non-Hispanic Black adults tested positive for H. pylori, compared with about 21% of non-Hispanic white adults. Some studies also find Black adults are more likely to carry the more aggressive CagA strains, which raise ulcer and cancer risk further.

This is not a small difference. H. pylori is the major cause of ulcers and is classified by the World Health Organization as a carcinogen, so a bacterium that is twice as common in your community translates directly into more ulcers and more stomach cancer. The good news is that it is treatable, and treating it lowers your cancer risk.

The classic symptom of a peptic ulcer is a burning or gnawing pain in the upper abdomen, often between meals or at night when the stomach is empty. Some people also feel bloating, fullness after small meals, nausea, or loss of appetite, and over time, unintended weight loss. Many people with H. pylori have no symptoms at all, which is why testing, not waiting for pain, is the point.

The danger is a bleeding ulcer, which is a medical emergency. The warning signs are black, tarry, or sticky stools, vomiting blood or material that looks like coffee grounds, and sudden, sharp, severe stomach pain that does not let up. These signs mean the ulcer is bleeding or has perforated, and they need emergency care, not a wait-and-see week.

For most of the last century, doctors blamed ulcers on stress, spicy food, and personality. That was wrong. After H. pylori was discovered in 1982, study after study showed that killing the bacteria cured the ulcers, and the National Institutes of Health confirmed in 1994 that H. pylori causes peptic ulcers. Today the two real causes are clear: H. pylori infection accounts for most ulcers, and the next biggest cause is regular use of NSAID pain relievers like ibuprofen, naproxen, and aspirin. Spicy food may irritate an ulcer you already have, but it does not create one.

That matters for what you do next. If you take NSAIDs often, for joint pain, headaches, or back pain, talk to your clinician about the lowest dose you need and whether a stomach-protecting medication makes sense. If you have reflux or heartburn layered on top of stomach pain, our guide to GERD and acid reflux in Black adults breaks down what is heartburn and what is something more.

You do not need a major procedure to find out. There are three reliable tests: a urea breath test, where you drink a solution and breathe into a bag; a stool antigen test; and a biopsy taken during an upper endoscopy if you are already having one. The breath and stool tests are accurate and noninvasive, and both work as a test of cure later. One catch: acid-reducing PPI medications and recent antibiotics can cause a false negative, so your clinician may ask you to pause a PPI for about two weeks before testing.

The principle gastroenterologists follow is simple: if you test, you treat. There is no value in confirming an infection and leaving it. Because the infection is so common in Black adults and the cancer it can lead to is so deadly, having a low threshold to get tested when you have symptoms or a family history is reasonable and worth raising with your clinician.

H. pylori is cleared with a combination of medications, not a single antibiotic. The 2024 American College of Gastroenterology guideline recommends a 14-day bismuth quadruple therapy, which pairs an acid-reducing drug with bismuth and two antibiotics, as the preferred first treatment when the bacteria's drug sensitivities are unknown. Older clarithromycin-only regimens are now discouraged for most patients because resistance to that antibiotic in the United States has climbed past 30%.

Two things make or break treatment. First, finish the entire course exactly as prescribed, even when you feel better at day four, because a half-finished course breeds resistant bacteria and leaves the infection alive. Second, get a test of cure at least four weeks after you finish, using a breath test, a stool test, or a biopsy. Skipping that step means you never actually know whether the infection is gone, and a quietly persistent infection keeps the ulcer and cancer risk in place.

H. pylori is the strongest known risk factor for noncardia gastric adenocarcinoma, the most common type of stomach cancer. Stomach cancer is both more common and more deadly in Black Americans: mortality from noncardia gastric cancer runs two to three times higher in Black adults than in white adults across age groups and stages. Treating the infection is one of the few things shown to move that risk. A 2025 meta-analysis of randomized trials and observational studies found that eradicating H. pylori cut gastric cancer risk by about 45% compared with leaving it untreated.

Family history sharpens the case. If a parent or sibling has had stomach cancer or recurrent ulcers, your own risk is higher, and testing for H. pylori is worth discussing even without symptoms. Stomach cancer caught early is far more survivable than stomach cancer caught late, and persistent symptoms deserve a workup rather than another round of antacids. If you are already thinking about cancer screening, our guide to colon cancer screening for Black adults covers a related screening that starts at 45.

Start with a clinician who will actually order the test. A primary care doctor can request a breath or stool test and prescribe treatment, and a gastroenterologist handles endoscopy and biopsy when symptoms are severe, persistent, or come with red flags. You can find a Black gastroenterologist or primary care clinician in our directory. Bring two things to the visit: your symptoms with how long they have lasted, and your family history of ulcers or stomach cancer. Ask directly: should I be tested for H. pylori, and if it is positive, what is the plan to confirm it is gone afterward?