How Often to Get an Endoscopy for Autoimmune Gastritis?

The short answer is that your endoscopy schedule depends on the exact changes happening in your stomach lining. If your stomach shows advanced damage (high-risk), international guidelines generally recommend an endoscopy every 3 years ^[1][2]. If your damage is mild or confined to a small area (low-risk), you may only need an endoscopy every 5 years—or your doctor may recommend a personalized schedule based on your unique health profile ^[3][1].

Because autoimmune gastritis (AIG) increases the risk of developing two types of stomach tumors—gastric adenocarcinoma (stomach cancer) and Type 1 gastric neuroendocrine tumors (gNETs)—regular endoscopies are the best way to catch any changes early ^[4][3].

What the Major Guidelines Say

Gastroenterologists rely on major medical organizations to guide how often to perform endoscopies. The two most commonly referenced guidelines differ slightly in their approach:

• The MAPS II Guidelines: These are the European guidelines for managing precancerous conditions in the stomach. MAPS II recommends that patients with severe, widespread atrophy (loss of normal stomach glands) have an endoscopy every 3 years ^[1][2]. For patients with mild damage, routine surveillance is not strictly required unless they have other risk factors, though many doctors still opt for a 3-to-5-year interval due to the risk of gNETs ^[1][3].
• The AGA Guidelines: The American Gastroenterological Association acknowledges that the perfect, one-size-fits-all schedule for AIG is still unclear ^[3]. Instead of a strict timeline, the AGA recommends an individualized approach ^[3]. This means you and your doctor should decide on a schedule together (shared decision-making) based on your specific biopsy results and risk factors ^[3].

Understanding Your “OLGA” Stage

To determine whether you are high-risk or low-risk, pathologists use a scoring system called OLGA (Operative Link for Gastritis Assessment) ^[5]. Sometimes, a similar system called OLGIM is used. When you get an endoscopy, the doctor takes tiny tissue samples (biopsies) from different parts of your stomach ^[3][6]. The lab looks at these samples to see how much of your stomach lining shows a loss of normal stomach glands (atrophy) or has been replaced by altered cells (a process called intestinal metaplasia).

Note: In the United States, pathology labs do not always calculate your OLGA or OLGIM score automatically. You or your doctor may need to specifically request that your biopsies be scored using this system.

• OLGA/OLGIM Stages III and IV (High-Risk): This means the atrophy or metaplasia is severe and widespread. Patients with these stages have a higher risk of gastric adenocarcinoma and need closer monitoring, typically every 3 years ^[5][7].
• OLGA/OLGIM Stages I and II (Lower-Risk): This means the damage is mild or isolated. While the risk of adenocarcinoma is lower, patients with AIG can still develop gNETs, so surveillance remains important ^[8][9].

The Exception: Neuroendocrine Tumors (gNETs)

While the risk for traditional stomach cancer (adenocarcinoma) is the main driver for the 3-to-5-year guidelines, AIG also makes you prone to developing Type 1 gastric neuroendocrine tumors (gNETs) ^[4][10]. These tumors are usually small, slow-growing, and rarely spread ^[11][12].

If an endoscopy finds small gNETs, they can often be removed during the procedure itself ^[3][13]. However, because they tend to come back, your surveillance schedule will change. Guidelines recommend that if you have had a gNET removed, you should have follow-up endoscopies every 1 to 2 years, depending on how many tumors there were and their size ^[3].

Additional Risk Factors That May Shorten Your Timeline

Your doctor may recommend more frequent endoscopies (such as every 3 years instead of 5, or even sooner) if you have additional risk factors, including:

• A past or current H. pylori infection: This common stomach bacteria dramatically increases the risk of stomach cancer when combined with AIG ^[14][1].
• Family history: Having a first-degree relative with stomach cancer ^[1].
• Age over 65 ^[15].
• Pernicious anemia: Autoimmune gastritis destroys the cells that produce intrinsic factor, which is needed to absorb vitamin B12. When B12 deficiency becomes severe enough to cause pernicious anemia, it usually indicates that the AIG has progressed to a more advanced stage, placing you in a higher risk category ^[16][8].

What to Watch for Between Endoscopies

Because autoimmune gastritis behaves differently in everyone, your biopsy report is your roadmap. Even if you are on a comfortable 3-year or 5-year surveillance schedule, you should not wait for your next appointment if you develop new symptoms. Contact your doctor if you experience unexplained weight loss, persistent abdominal pain, dark or black stools, vomiting, or trouble swallowing, as these can warrant an earlier scope.