Stomach Cancer in Black Americans: The H. pylori Lever

Stomach cancer, also called gastric cancer, is not common in the United States, but it is not equal. Black Americans are diagnosed at roughly twice the rate of white Americans and die of it at nearly twice the rate. Most of that gap traces to one infection: Helicobacter pylori, a bacterium that lives in the stomach lining, is the leading cause of stomach cancer, and is far more common in Black adults. It is also the one major risk factor a simple test can find and a course of antibiotics can clear. The catch is that early stomach cancer barely announces itself. The first signs (mild indigestion, feeling full after a few bites, low-grade nausea) are the kind people live with for months, which is why this cancer is so often found late.

Almost all stomach cancers are adenocarcinomas, meaning they start in the gland cells that line the stomach. Doctors split them by location. Cardia cancer starts at the top of the stomach where it meets the esophagus. Non-cardia cancer starts in the main body and lower part of the stomach. The distinction matters for Black patients because the two have different drivers. Cardia cancer is tied more to obesity and acid reflux and is more common in white Americans. Non-cardia cancer, the type more strongly linked to H. pylori, falls hardest on Black, Hispanic, Asian, and Native American adults.

That pattern is well documented. A SEER-based analysis published in Cancer Control found that white Americans have the lowest incidence of non-cardia stomach cancer of any racial group, while Black and Asian populations carry markedly higher rates. So the disparity is not spread evenly across the stomach. It is concentrated in the lower stomach, exactly where H. pylori does its damage.

The American Cancer Society estimates about 31,510 new stomach cancer cases and about 10,740 deaths in the United States in 2026, with an average age at diagnosis of 68. Those national totals hide the race gap. In adults 50 and older, gastric cancer incidence runs about 34.6 per 100,000 in Black Americans versus 20.4 per 100,000 in white Americans, and incidence-based mortality runs about 28.8 per 100,000 in Black adults versus 16.3 in white adults. Black Americans are also more likely to be diagnosed at a later stage, when the cancer has already spread and is harder to cure.

H. pylori is a bacterium that infects the stomach lining, often in childhood, and can sit there quietly for decades. In some people it causes chronic inflammation that, over years, can progress through pre-cancerous changes (atrophy, then intestinal metaplasia) toward cancer. The World Health Organization classifies it as a definite carcinogen. It is the single largest known cause of non-cardia stomach cancer.

This is where the Black disparity is built. In national NHANES data, about 52 percent of non-Hispanic Black adults carried H. pylori compared with about 21 percent of non-Hispanic white adults, a gap that held even after accounting for income and country of origin. Black adults are also more likely to carry the more aggressive, cancer-associated strains of the bacterium. More infection, with more dangerous strains, in the part of the stomach where most of the cancer occurs. That chain explains a large share of the gap.

The reason this matters so much is that the infection is reversible. Pooled randomized trials show that treating and clearing H. pylori lowers the risk of later stomach cancer by roughly a third in healthy infected people, and by more in people who already have pre-cancerous changes. A two-week course of antibiotics plus an acid-suppressing drug clears it in most cases, and a follow-up breath or stool test confirms it is gone. If you have had stomach ulcers, a family member with stomach cancer, or ongoing upper-stomach symptoms, ask your doctor whether you should be tested. We cover the testing and treatment in detail in our guide to H. pylori, stomach ulcers, and Black adults.

H. pylori is the biggest modifiable risk, but it is not the only one. The others compound it:

• Smoking. Tobacco roughly doubles stomach cancer risk and raises it most in the upper stomach.
• Diet high in salt, smoked, and processed foods. Heavily salted, pickled, smoked, and cured foods are linked to higher risk; fresh fruit and vegetables are linked to lower risk.
• Family history. Having a parent, sibling, or child with stomach cancer raises your risk, partly through shared genetics and partly through shared H. pylori in a household.
• Pernicious anemia and chronic atrophic gastritis. These conditions damage the stomach lining and raise risk over time.
• Older age and male sex. Most cases occur after 60, and men are diagnosed more often than women.
• Prior stomach surgery. Earlier surgery for ulcers can change the stomach environment and raise long-term risk.

The core problem with stomach cancer is timing. Early on, it produces symptoms that look exactly like ordinary indigestion: a burning or aching feeling in the upper belly, bloating after meals, feeling full after only a few bites, mild nausea, and loss of appetite. People treat these with antacids and wait. By the time the louder symptoms arrive, the cancer is often advanced.

The louder symptoms are the ones to never wait out: unintended weight loss, vomiting (sometimes with blood), trouble or pain when swallowing, feeling full after very little food, and black or tarry stools, which signal bleeding higher up in the digestive tract. Persistent stomach pain that does not settle with usual treatment belongs in the same category. Any of these warrants a prompt evaluation rather than another month of over-the-counter remedies.

Stomach cancer is diagnosed by looking inside the stomach, not by a blood test or a plain X-ray. The test is an upper endoscopy: a thin, flexible camera passed through the mouth into the stomach while you are sedated. If the doctor sees a suspicious area, they take a biopsy, and a pathologist confirms whether it is cancer. If cancer is found, CT scans and sometimes an endoscopic ultrasound map how far it has spread, which sets the stage and the treatment. There is no routine stomach cancer screening for the general US population, which makes paying attention to symptoms, and clearing H. pylori, the practical front line.

Treatment depends on the stage. Very early tumors confined to the stomach lining can sometimes be removed during endoscopy. Most localized cancers are treated with surgery to remove part or all of the stomach, often combined with chemotherapy before and after the operation. More advanced cancers are treated with chemotherapy, and increasingly with targeted drugs and immunotherapy matched to the tumor's biology, including HER2 and PD-L1 testing. The single biggest factor in survival is stage at diagnosis, which is why the gap in late-stage diagnosis for Black patients translates directly into a gap in survival. This is also why stomach cancer is connected to other gut cancers where Black Americans face screening and outcome gaps, including our guide to colon cancer screening for Black adults.

Two actions move the needle. First, if you have ulcer history, a family member with stomach cancer, or stomach symptoms that keep returning, ask your primary care doctor to test you for H. pylori and to treat it if it is there. Second, do not let vague upper-stomach symptoms ride for months; ask whether you need an upper endoscopy, especially if you have any red-flag symptom. If you want a clinician who understands how these conversations go in Black families and will not wave off your symptoms, you can find a Black gastroenterologist or primary care doctor in our directory. Bring a short written list of your symptoms, when they started, and your family history. It keeps the visit focused on the question that matters: do I need to look inside my stomach.