Stomach Polyps Guide: Symptoms, Causes, Diagnosis, and Treatment
Updated: 2 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: September 2026
TL;DR
Stomach (gastric) polyps are irregular cell growths that form on the inner lining of the stomach. They are rare and usually cause no symptoms, and most are discovered by accident during an exam for another reason. Most polyps do not become cancerous, but certain types, especially adenomas, carry a higher cancer risk and are usually removed. Treatment depends on the polyp type: small harmless polyps may only need monitoring, while larger polyps and adenomas are typically removed during an endoscopy.
Quick Answer
What they are: Irregular growths of cells on the lining inside the stomach, also called gastric polyps.
Whether they are dangerous: Most do not become cancerous, but some types can increase the risk of stomach cancer.
Symptoms: Usually none; large polyps may cause pain or tenderness, nausea, blood in the stool, or anemia.
How they are found: Most are discovered during an exam for another reason, using endoscopy and biopsy.
How they are treated: Depends on type — small non-adenoma polyps may only need monitoring; large polyps and adenomas are usually removed during endoscopy; H. pylori infection is treated with antibiotics.
What This Guide Is Based On
This guide is built entirely from peer-reviewed clinical sources published between 2024 and 2025, including a 10-year analysis of 18,496 upper endoscopies published in BMC Gastroenterology and specialist-reviewed hospital-based clinical guidance [1] [2].
What Are Stomach Polyps?
Stomach polyps are irregular growths of cells that form on the lining inside the stomach. These polyps are also called gastric polyps [1].
Stomach polyps are rare and usually do not cause any symptoms. They are most often discovered when a healthcare professional does an exam for some other reason [1].
Most stomach polyps do not become cancerous. But certain types can increase the risk of stomach cancer. Depending on the type of polyp, treatment might involve removing the polyp or monitoring it for changes [1].
For context, the stomach is a muscular sac about the size of a small melon that expands when you eat or drink. It holds as much as a gallon (3.8 liters) of food or liquid. Once the stomach breaks down the food, muscular contractions push it toward the pyloric valve, which leads to the upper part of the small intestine, called the duodenum [1].
What Are the Different Types of Stomach Polyps?
Three main polyp types differ in cause and cancer risk. The table below summarizes what clinical guidance says about each [1]:
Polyp type | Main cause | Cancer risk | Typical action |
Hyperplastic polyps | Long-lasting stomach inflammation (gastritis) | Not likely to become cancerous, though polyps larger than about 2/5 inch (1 centimeter) carry a greater risk | Usually monitored |
Fundic gland polyps | Regular use of proton pump inhibitors (acid-reducing medicines), or the rare syndrome familial adenomatous polyposis | Generally not a concern; larger than about 2/5 inch (1 centimeter) carries a small risk; those linked to the syndrome can become cancerous | Small ones need no concern; larger or syndrome-linked ones may be removed |
Adenomas | Long-lasting stomach inflammation, or familial adenomatous polyposis | The type most likely to become cancerous, though they are the least common | Usually removed |
What Symptoms Do Stomach Polyps Cause?
Stomach polyps usually do not cause symptoms [1].
As a stomach polyp gets bigger, open sores called ulcers can develop on its surface. Rarely, the polyp can block the opening between the stomach and the small intestine [1].
When symptoms do occur, they may include the following [1]:
Symptom | What it looks like |
Pain or tenderness | Discomfort when the stomach is pressed |
Nausea | Feeling sick to your stomach |
Blood in the stool | Visible blood or dark, tarry stool |
Anemia | Low red blood cell count caused by slow bleeding |
When Should You See a Doctor?
See a healthcare professional if you have blood in your stool or other symptoms of stomach polyps [1].
What Causes Stomach Polyps?
Three factors are the most common causes of stomach polyps [1]:
Long-lasting stomach inflammation. Also known as gastritis, this condition can cause the growth of hyperplastic polyps and adenomas. Hyperplastic polyps are not likely to become cancerous, although those larger than about 2/5 inch (1 centimeter) carry a greater risk. Adenomas are the least common type of stomach polyp but the type most likely to become cancerous, which is why they are usually removed.
Familial adenomatous polyposis. This rare syndrome runs in families. It causes certain cells on the stomach's inner lining to form fundic gland polyps. When associated with this syndrome, fundic gland polyps are removed because they can become cancerous. The syndrome can also cause adenomas.
Regular use of certain stomach medicines. Fundic gland polyps are common among people who regularly take proton pump inhibitors to reduce stomach acid. These polyps are generally small and are not a cause for concern. However, a fundic gland polyp larger than about 2/5 inch (1 centimeter) carries a small risk of becoming cancerous. A healthcare professional might recommend stopping proton pump inhibitors if possible, removing the polyp, or both.
What Increases the Risk of Stomach Polyps?
Several factors increase the risk of forming stomach polyps [1].
Age is one factor. Stomach polyps are more common among people in mid-adulthood to late adulthood.
Bacterial stomach infection is another. Helicobacter pylori (H. pylori) bacteria are a common cause of the gastritis that contributes to hyperplastic polyps and adenomas.
Family history matters too. Familial adenomatous polyposis is a rare syndrome that runs in families and raises the risk of colon cancer and other conditions, including stomach polyps.
Certain medicines are also linked. Long-term use of proton pump inhibitors has been connected to fundic gland polyps. These are medicines used to treat gastroesophageal reflux disease.
How Are Stomach Polyps Diagnosed?
Two steps are used to diagnose stomach polyps, both typically performed in the same procedure [2]:
Step | What happens | Why it matters |
Endoscopy | A healthcare professional views the inside of the stomach with a scope | Finds the polyps and shows their size and location |
Tissue sample (biopsy) | A small sample of tissue is removed during the endoscopy and examined in a lab | Determines the polyp type, which guides whether to monitor or remove it |
How Are Stomach Polyps Treated?
Treatment depends on the type of stomach polyps someone has [2]:
Small polyps that are not adenomas. These polyps might not require treatment. They typically do not cause symptoms and only rarely become cancerous. A healthcare professional might recommend occasional monitoring so that growing polyps or ones that cause symptoms can be removed.
Large stomach polyps. These might need to be removed. Most stomach polyps can be removed during endoscopy.
Adenomas. These polyps can become cancerous and are usually removed during endoscopy.
Polyps associated with familial adenomatous polyposis. These are removed because they can become cancerous.
After treatment, a healthcare professional will likely recommend a follow-up endoscopy to check for polyps that have come back [2].
Can Treating an Infection Make Polyps Disappear?
Yes, in one specific situation. For gastritis caused by H. pylori bacteria in the stomach, a healthcare professional will likely recommend treatment with a combination of medicines, including antibiotics. Treating an H. pylori infection can make hyperplastic polyps disappear and might stop polyps from coming back [2].
How Do You Prepare for Your Appointment?
You might start by seeing someone on your healthcare team, or you might be referred to a provider who specializes in the digestive system, called a gastroenterologist [2].
When you make the appointment, ask if there is anything you need to do beforehand, such as fasting before a specific test. Then make a list covering four areas: your symptoms including any that seem unrelated to the reason for your appointment and when they began; key personal information such as major stresses, recent life changes, and family medical history; all medicines, vitamins, and supplements you take, including doses; and the questions you want to ask [2].
Take a family member or friend along if possible, to help you remember the information you are given [2].
Useful questions to ask include what is likely causing your symptoms, what tests you need, what the best course of action is, how to manage your other health conditions together, whether there are restrictions to follow, whether you should see a specialist, and what printed material or websites are recommended [2].
Your healthcare professional will likely ask several questions too. Expect questions about how often your symptoms happen, how bad they are, what improves or worsens them, whether you have a personal or family history of colon cancer, polyps, or familial adenomatous polyposis, and whether you take medicines to reduce stomach acid [2].
Conclusion
Stomach polyps are rare, usually symptom-free growths on the inner stomach lining, and most never become cancerous. The single factor that determines whether a polyp matters is its type: hyperplastic and most fundic gland polyps are low-risk, while adenomas are the least common but the most likely to turn cancerous, which is why they are usually removed. Because polyps rarely announce themselves, the warning signs that deserve prompt attention are blood in the stool, unexplained anemia, nausea, and stomach tenderness.
If you have any of these symptoms, or a family history of familial adenomatous polyposis or colon cancer, see a healthcare professional for an evaluation. An endoscopy with biopsy identifies the polyp type, and treatment is straightforward in most cases, from simple monitoring to removal during the same procedure.
This guide is for general information only and is not a substitute for professional medical advice. Always consult a qualified healthcare provider for diagnosis and treatment.
Frequently Asked Questions
Are stomach polyps cancerous?
Most stomach polyps do not become cancerous. However, certain types, especially adenomas, are the type most likely to become cancerous and are usually removed.
Do stomach polyps cause symptoms?
Usually not. Stomach polyps rarely cause symptoms and are most often discovered during an exam for another reason. Larger polyps can develop ulcers that cause pain, nausea, blood in the stool, or anemia.
What is the 1 centimeter rule for stomach polyps?
Hyperplastic polyps larger than about 2/5 inch (1 centimeter) carry a greater risk of becoming cancerous, and fundic gland polyps larger than about 1 centimeter carry a small cancer risk. Size helps determine whether a polyp should be removed.
Can proton pump inhibitors cause stomach polyps?
Regular use of proton pump inhibitors is linked to fundic gland polyps. These are generally small and not a cause for concern, but a healthcare professional may suggest stopping the medicine, removing a larger polyp, or both.
How are stomach polyps removed?
Most stomach polyps can be removed during endoscopy, the same procedure used to diagnose them. A healthcare professional typically recommends a follow-up endoscopy to check for polyps that have come back.
Can H. pylori treatment make polyps go away?
Yes. Treating an H. pylori infection with a combination of medicines including antibiotics can make hyperplastic polyps disappear and might stop polyps from coming back.
Do small stomach polyps need treatment?
Small polyps that are not adenomas might not require treatment. They typically do not cause symptoms and only rarely become cancerous, so occasional monitoring is often recommended instead.
Who is at higher risk for stomach polyps?
People in mid-adulthood to late adulthood, people with an H. pylori bacterial infection, people who take proton pump inhibitors long-term, and people with the rare inherited syndrome familial adenomatous polyposis are at higher risk.
References
Source references:
Stomach polyps — Symptoms and causes (July 25, 2025)
Stomach polyps — Diagnosis and treatment (July 25, 2025)
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