What Is a Gastric Polyp? Types, Causes, and Treatment

A gastric polyp is a growth that protrudes from the inner lining of the stomach, almost always discovered by accident during an upper endoscopy performed for another reason. In one hospital-based study, gastric polyps turned up in fewer than 1% of all endoscopies, and over 90% of those patients had no symptoms at all.¹ Most gastric polyps are harmless, but the word “most” does real work here, because the type of polyp, its size, and the condition of the surrounding stomach lining all change what it means for you.

How Common They Are and Why the Numbers Keep Rising

If you look at endoscopy reports over the past few decades, gastric polyps have become much more common. The biggest driver is a dramatic increase in one specific type, fundic gland polyps, which researchers have linked to the widespread use of proton pump inhibitors (acid-suppressing drugs like omeprazole and pantoprazole) and the declining prevalence of Helicobacter pylori infection. One analysis described the rise in fundic gland polyps as a 1,400% increase, essentially explaining the overall upward trend in gastric polyp diagnoses on its own.² So if your endoscopy report says “gastric polyp found,” you are far from alone, and the finding is increasingly routine.

Fundic Gland Polyps

Fundic gland polyps are the most frequently encountered type. They form in the upper portion of the stomach (the fundus) and are usually small, smooth, and multiple. In people taking PPIs long-term, fundic gland polyps are by far the dominant finding. One study of patients with gastric polyps linked to extended PPI use found that roughly two-thirds were fundic gland polyps, with hyperplastic polyps making up about a quarter and inflammatory polyps accounting for a small remainder.³ A systematic review and meta-analysis confirmed that taking PPIs for a year or longer raises the risk of developing these polyps.⁴

For the vast majority of people, sporadic fundic gland polyps are essentially harmless. They have negligible cancer potential and often do not even need to be biopsied if the endoscopist recognizes them confidently. The exception is people with familial adenomatous polyposis (FAP), a hereditary condition that predisposes to polyps throughout the digestive tract. In FAP patients, fundic gland polyps behave differently. They carry genetic alterations in the APC gene, can develop dysplasia (abnormal cell changes), and in rare cases have been associated with gastric cancer.⁵ Research on FAP patients who are negative for H. pylori found that as fundic gland polyps became more widely distributed across the stomach, the risk of gastric neoplasm increased considerably, with the most widespread distribution carrying significantly elevated odds.⁶

If you do not have FAP, a fundic gland polyp is one of the least worrying findings you can get from an endoscopy. If you are on a long-term PPI and develop them, your doctor may discuss whether you still need the medication at its current dose, but the polyps themselves almost never require removal.

Hyperplastic Polyps and the H. pylori Connection

Hyperplastic polyps are the second most common type. Unlike fundic gland polyps, they have a strong connection to chronic stomach inflammation, and the most important cause of that inflammation is infection with H. pylori. Cross-sectional data show that hyperplastic polyps are roughly four to five times more likely to occur in someone who is H. pylori-positive compared with fundic gland polyps.⁷

This connection has a practical payoff. In randomized trials, treating the H. pylori infection often causes the polyps to shrink or vanish entirely without any need for surgical or endoscopic removal. One early trial found that most hyperplastic polyps disappeared after the infection was eradicated, while none resolved in untreated patients.⁸ Later controlled trials confirmed this: in one, polyps disappeared in about two-thirds of treated patients over an average of roughly six months, while no untreated patients showed any change.⁹ Another trial showed that all patients in the eradication group had some degree of polyp regression, while none in the untreated group did.¹⁰

British Society of Gastroenterology guidelines reflect this evidence: if H. pylori is present, eradication should be attempted before considering endoscopic removal of hyperplastic polyps.¹¹ The guidelines also suggest that hyperplastic polyps larger than 1 cm, those with a stalk, or those causing symptoms like bleeding should be removed endoscopically.

Large hyperplastic polyps deserve some caution because a small percentage can harbor dysplasia or even early cancer, particularly when they grow beyond 1 to 2 cm. That risk is low but not zero, which is why biopsy and sometimes removal are standard for bigger ones.

Adenomatous Polyps

Adenomas are the gastric polyp type that raises the most concern. Unlike the colon, where most cancers arise from adenomatous polyps, the stomach has a different landscape: most gastric polyps have low malignant potential.¹² But gastric adenomas are the exception. They represent true precancerous growths and carry a meaningful risk of progressing to gastric cancer if left alone. Guidelines are unambiguous on this point: all adenomas should be resected when it is safe to do so.¹¹

Gastric adenomas are also a signal to look at the surrounding stomach carefully. When adenomas or hyperplastic polyps are found, guidelines recommend the endoscopist assess the background mucosa for signs of chronic damage like atrophy and intestinal metaplasia, check for H. pylori, and look for any other simultaneous lesions.¹¹ The polyp itself matters, but the state of the rest of the stomach often matters just as much for your long-term risk.

Less Common Types Worth Knowing About

Not every bump inside the stomach is a classical polyp growing from the surface lining. Subepithelial lesions, meaning growths that originate from deeper layers of the stomach wall, can look like polyps on endoscopy. These include gastrointestinal stromal tumors (GISTs), leiomyomas, lipomas, and even heterotopic pancreas (a small island of pancreatic tissue that ended up in the wrong location during development). On standard endoscopy, a GIST and a leiomyoma can appear nearly identical: smooth-bordered bumps sometimes with a small ulcer on top. Endoscopic ultrasound helps distinguish them by showing which layer of the stomach wall the growth arises from and by enabling tissue sampling for a more precise diagnosis.¹³ Because these deeper growths can occasionally mimic malignancy, they are worth identifying correctly rather than assuming they are simple polyps.¹⁴

Gastric neuroendocrine tumors are another category that can present as small polyp-like nodules, particularly in the body of the stomach. Type 1 neuroendocrine tumors arise in the setting of autoimmune gastritis, where chronic inflammation destroys the acid-producing cells and triggers a compensatory rise in the hormone gastrin, which in turn stimulates growth of certain hormone-producing cells. These type 1 tumors are generally slow-growing, but they do require monitoring.¹⁵

Symptoms and When Polyps Cause Trouble

The typical gastric polyp causes nothing. You eat, digest, and go about your life unaware it is there. Symptoms arise in a minority of cases, usually when a polyp is large enough to bleed or to partially block the stomach’s outlet. Stomach pain and a feeling of fullness after eating small amounts are the symptoms most often reported when polyps do produce complaints.¹⁶

Bleeding is the most significant complication. It can be slow and chronic, leading to iron-deficiency anemia that builds gradually and might only show up on a blood test. Case reports document hyperplastic polyps causing acute upper gastrointestinal bleeding severe enough to require intensive care and urgent endoscopic removal.¹⁷ More commonly, hyperplastic antral polyps cause a slower blood loss that results in iron-deficiency anemia, particularly in older patients.¹⁸ If you have unexplained iron deficiency and a gastric polyp has been found, the two may be connected.

How They Are Identified and Biopsied

Standard white-light endoscopy is how most gastric polyps are first spotted. The endoscopist notes how many polyps are present, where they sit in the stomach, and how big the largest one is. Guidelines stress that this documentation, along with photographs, should happen every time.¹¹ For any polyp that is not confidently identified as a fundic gland polyp by its appearance alone, biopsy is recommended.

Advanced imaging techniques are making it possible to characterize polyps more precisely during the procedure. Narrow-band imaging (NBI), which uses specific wavelengths of light to highlight blood vessel and surface patterns, has shown promise in distinguishing adenomas from hyperplastic polyps and in identifying early cancers by features like central erosion and a visible demarcation line.¹⁹ Researchers have developed NBI-based algorithms that can identify low-risk polyps with high confidence, potentially sparing some patients from unnecessary biopsies. In one study, a simple two-step algorithm safely identified about half of all polyps as low-risk without missing any high-risk lesions.²⁰ These approaches are not yet universal, but they point toward a future where fewer routine biopsies are needed.

Treatment and Removal

Treatment depends entirely on what type of polyp you have. Fundic gland polyps in someone without FAP rarely need anything done beyond recognition. Hyperplastic polyps linked to H. pylori should first be treated with antibiotic eradication therapy, as described earlier, since many will resolve on their own. Removal is reserved for larger hyperplastic polyps, those with stalks, or those causing symptoms like bleeding.

Adenomas are always removed when feasible, typically by endoscopic techniques. Small polyps can be snared during a standard endoscopy. Larger or flatter lesions may require more advanced techniques like endoscopic mucosal resection, where fluid is injected under the polyp to lift it from the stomach wall before it is cut away. For very large or complex lesions, endoscopic submucosal dissection allows removal in one piece, which gives the pathologist a better sample to evaluate margins and confirm complete excision.

Surveillance After Polyp Removal

What happens after a polyp is removed depends on what the pathologist finds under the microscope. After complete removal of an adenoma, a follow-up endoscopy is recommended at 12 months, with ongoing annual surveillance after that.¹¹ If the adenoma showed high-grade dysplasia (more advanced abnormal cell changes), an AGA clinical practice update recommends a shorter follow-up interval of six months for completely resected lesions. If resection was incomplete or only a biopsy was taken from a high-grade dysplasia polyp, follow-up endoscopy is advised within three months.²¹

For hyperplastic polyps, the surveillance plan is less intensive and focuses more on whether the underlying condition (like H. pylori infection or autoimmune gastritis) has been addressed. The key message is that the polyp type determines the follow-up schedule, which is why biopsy and histological analysis are so important rather than simply removing a growth and moving on.

Autoimmune Gastritis and Polyp Formation

Autoimmune gastritis is an underappreciated driver of gastric polyps. In this condition, the immune system attacks the stomach’s acid-producing cells, gradually thinning the lining and reducing acid output. The loss of acid triggers a feedback loop: gastrin levels rise in an attempt to stimulate more acid, and that excess gastrin promotes the growth of certain cell types in the stomach wall.²² The result is a stomach prone to growing both hyperplastic polyps and type 1 neuroendocrine tumors.

In one retrospective study of patients with autoimmune atrophic gastritis, about 37% had type 1 neuroendocrine tumors and roughly 32% had hyperplastic polyps, including a subset where those hyperplastic polyps had undergone neoplastic transformation.²³ This rate of polyp-associated findings is much higher than in the general endoscopy population and explains why patients with autoimmune gastritis typically need periodic endoscopic surveillance.

Blood tests measuring pepsinogen levels and gastrin-17 can help flag the kind of stomach-lining damage seen in autoimmune gastritis. Research suggests that gastrin-17 levels, either alone or combined with pepsinogen assays, can be useful for detecting gastric neoplasms that develop in the setting of corpus atrophy, including adenomas and neuroendocrine tumors.²⁴ These tests are not a replacement for endoscopy, but they may help identify which patients deserve closer monitoring.

Lifestyle Factors Linked to Gastric Polyps

Beyond infections and medications, a handful of lifestyle habits have been associated with a higher chance of developing gastric polyps. A study examining potential risk factors found that dietary habits played a role: high-salt diets, eating very hot food, eating quickly, consuming leftovers frequently, and low fruit intake were all linked to polyp development, while regular vegetable and fruit consumption appeared to be protective.²⁵ Separately, a large screening study in asymptomatic adults found that being between 45 and 60 years old and currently smoking were both independent predictors of having gastric polyps.²⁶

None of these lifestyle factors carry the same weight as H. pylori infection or long-term PPI use, and the evidence is thinner, mostly coming from observational studies with the usual limitations. Still, the direction of the findings is consistent with what we know about stomach health more broadly: chronic irritation and inflammation of the stomach lining, whether from infection, acid, diet, or smoking, creates the conditions where abnormal growths are more likely to develop.

1
MDPI (Journal of Clinical Medicine). Gastric Polyps Detected Incidentally during Gastroscopy and Follow-Up Results
2
Revista de Investigación Clínica. Changing Trends in Gastric Polyps
3
PubMed Central. Gastric Polyps in Long-Term Proton Pump Inhibitor Use: Identification of Risks and Characteristics
4
PubMed. Use of Proton Pump Inhibitors and Risks of Fundic Gland Polyps and Gastric Cancer: Systematic Review and Meta-analysis
5
PubMed Central. Fundic gland polyps in familial adenomatous polyposis: neoplasms with frequent somatic adenomatous polyposis coli gene alterations
6
PubMed. Classification of fundic gland polyps for predicting gastric neoplasms in Helicobacter pylori-negative patients with familial adenomatous polyposis
7
PubMed Central. Gastric polyps: Association with Helicobacter pylori status and the pathology of the surrounding mucosa, a cross sectional study
8
PubMed. Disappearance of hyperplastic polyps in the stomach after eradication of Helicobacter pylori. A randomized, clinical trial
9
PubMed Central. Effect of drug treatment on hyperplastic gastric polyps infected with Helicobacter pylori: a randomized, controlled trial
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PubMed. Helicobacter pylori Eradication Regressed Gastric Hyperplastic Polyp: A Randomized Controlled Trial
11
PubMed. British Society of Gastroenterology guidelines on the diagnosis and management of patients at risk of gastric adenocarcinoma
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14
PubMed. CT of benign polypoid gastric masses: pearls, pitfalls & differential diagnosis
15
PubMed Central. Gastric neuroendocrine neoplasms: A review
16
PubMed Central. Gastric Inflammatory Fibroid Polyp: A Rare Cause of Occult Upper Gastrointestinal Bleeding
17
PubMed Central. Hyperplastic Gastric Polyp Causing Upper Gastrointestinal Hemorrhage and Acute Blood Loss Anemia
18
PubMed. Hyperplastic polyps of the gastric antrum in patients with gastrointestinal blood loss
19
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20
PubMed Central. Development of a narrow-band imaging classification to reduce the need for routine biopsies of gastric polyps
21
PubMed. AGA Clinical Practice Update on Management of Gastric Polyps: Expert Review
22
PubMed Central. Association between autoimmune gastritis and gastric polyps: Clinical characteristics and risk factors
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PubMed. Gastric lesions in patients with autoimmune metaplastic atrophic gastritis: a retrospective study in a single center
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PubMed Central. A Prospective Study on the Detection of Gastric Neoplasms Using Pepsinogen and Gastrin-17 Levels
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PubMed Central. The Prevalence and Risk Factors of Gastric Polyp in Asymptomatic Patients Receiving Health Examination