Stomach cancer is not rare globally. It ranks as the fifth most common cancer worldwide in both new cases and deaths. In the United States, however, it is considerably less common than in many other countries, accounting for about 1.5% of all new cancer diagnoses each year. So the answer depends on where you live and, significantly, on your ethnic background and family history.
How Common It Is Worldwide vs. the US
Globally, stomach cancer (also called gastric cancer) is a major cause of cancer death, ranking fifth for both incidence and mortality according to the International Agency for Research on Cancer. Rates are especially high in East Asia, parts of South America, and Eastern Europe. In contrast, the US and most of Western Europe have much lower rates, which is partly why Americans sometimes assume the disease is rare.
That assumption can be misleading. While stomach cancer is uncommon relative to cancers of the breast, lung, colon, or prostate in the US, it still affects tens of thousands of Americans each year. And rates vary dramatically by demographic group, meaning the cancer is far more common for some populations than others.
Who Gets It More Often
A California Cancer Registry analysis of adults 50 and older found stark differences by race and ethnicity. Compared to non-Hispanic white individuals, every non-white group studied had significantly higher rates of the most common form of stomach cancer (noncardia gastric adenocarcinoma). The disparity was greatest among Korean Americans, whose risk was 12 to 14.5 times higher than that of non-Hispanic white individuals of the same age and sex. Korean American men over 50 had an incidence of about 70 cases per 100,000, one of the highest rates documented in the US.
After Korean Americans, the groups with the highest rates among men were Japanese, Southeast Asian, Vietnamese, and Chinese Americans, followed by Hispanic and non-Hispanic Black men. Among women, the pattern was similar: Korean American women had the highest rates, followed by Vietnamese, Southeast Asian, and Chinese American women. Filipino and South Asian Americans had the lowest rates among non-white groups but were still at elevated risk compared to non-Hispanic white Americans.
Age matters too. Stomach cancer is overwhelmingly a disease of older adults, with incidence rates significantly lower in people under 50. That said, a worrying counter-trend has emerged in the US: among white adults aged 25 to 39, the rate of noncardia stomach cancer roughly doubled between the late 1970s and the mid-2000s. While the absolute numbers remain small, this increase stands in contrast to the declining rates seen in younger adults across most of East Asia.
The Role of H. Pylori Infection
The single biggest risk factor for stomach cancer is infection with Helicobacter pylori, a bacterium that colonizes the stomach lining. Roughly 75% of all stomach cancers are attributed to this infection. H. pylori causes chronic inflammation that, over decades, can lead to precancerous changes in the stomach lining. Not everyone who carries the bacterium develops cancer, but the link is strong enough that H. pylori is classified as a definite carcinogen.
Other factors that increase risk include a diet high in smoked, salted, or pickled foods, smoking, a family history of stomach cancer, and certain inherited genetic syndromes. Chronic conditions like gastric atrophy (thinning of the stomach lining) and pernicious anemia also raise risk.
Why It’s Often Found Late
One of the most dangerous things about stomach cancer is that early symptoms overlap almost entirely with common, harmless conditions. Upper abdominal pain, a sense of feeling full quickly, loss of appetite, and mild nausea are easy to dismiss or treat with over-the-counter antacids. Many people self-treat these symptoms as acid reflux or indigestion for months before seeing a doctor. Weight loss is the most frequently reported symptom by the time patients are evaluated, often alongside persistent stomach pain.
Even after someone seeks medical care, misdiagnosis is a documented contributor to delayed diagnosis. Early stomach cancer symptoms can be mistaken for peptic ulcer disease or gastritis, and without an endoscopy (a scope that lets a doctor visually inspect the stomach), the cancer may not be detected. In the US, there is no routine screening program for people at average risk, which means most cases are found only after symptoms become persistent or severe.
The result: only about 31% of stomach cancers are caught while still confined to the stomach. Another 24% are found after spreading to nearby lymph nodes, and 36% are not diagnosed until the cancer has already metastasized to distant parts of the body.
How Stage at Diagnosis Affects Survival
The stage at which stomach cancer is detected has an enormous impact on outcomes. When the cancer is localized, meaning it hasn’t spread beyond the stomach wall, the five-year relative survival rate is roughly 77%. That drops to about 37% once the cancer reaches regional lymph nodes, and falls to around 7.5 to 8% for cancers that have metastasized to distant organs.
These numbers underscore why early detection matters so much, and why the lack of routine screening in the US is a real problem for higher-risk groups. In countries like South Korea and Japan, where stomach cancer is much more common, national screening programs using endoscopy have helped catch the disease earlier and improve survival rates considerably.
Who Should Consider Screening
The National Cancer Institute notes that while there is no standard screening test for average-risk Americans, certain higher-risk groups may benefit from upper endoscopy. These include people with chronic gastric atrophy or pernicious anemia, those who have had part of their stomach surgically removed, people with a family history of stomach cancer, those with certain inherited genetic syndromes, and people who emigrated from countries where stomach cancer is more common.
If you fall into any of these categories, particularly if you are of Korean, Japanese, Vietnamese, Chinese, or Southeast Asian descent and over 50, screening is worth discussing with your doctor. Research suggests that screening for noncardia stomach cancer may be cost-effective for non-white individuals aged 50 and older, given their significantly elevated risk compared to non-Hispanic white Americans.