Why is Gastrin High? Causes, Symptoms, and What to Do

Gastrin is a hormone produced by the stomach that plays a key role in digestion by stimulating the production of gastric acid. It's important to understand why gastrin levels might be high, what symptoms to look for, and what steps to take next.

What is Gastrin?

Gastrin is a hormone primarily produced in the stomach. Its main function is to stimulate the secretion of gastric acid, which helps in digesting food. Gastrin levels are typically measured in picograms per milliliter (pg/mL). For adults, a normal fasting gastrin level ranges from 0 to 100 pg/mL. When gastrin levels exceed this range, it could indicate an underlying issue that requires further investigation.

Causes of High Gastrin Levels

High gastrin levels can be caused by several conditions:

• Zollinger-Ellison Syndrome: This is a condition characterized by one or more tumors in the pancreas or duodenum that secrete excessive amounts of gastrin. A markedly high fasting gastrin level with acidic stomach contents is suggestive of this syndrome.
• Chronic Atrophic Gastritis: This is a condition where the stomach lining is inflamed and thinned, leading to increased gastrin levels as the stomach tries to compensate for reduced acid production.
• Renal Failure: Kidney problems can interfere with the body's ability to filter and excrete gastrin, leading to elevated levels.
• Proton Pump Inhibitors (PPIs): These medications reduce stomach acid production, which can cause the stomach to produce more gastrin in response.

Symptoms of High Gastrin Levels

Symptoms of elevated gastrin levels can vary depending on the underlying cause but may include:

• Abdominal pain or discomfort
• Diarrhea
• Nausea or vomiting
• Gastroesophageal reflux disease (GERD)
• Peptic ulcers

These symptoms can affect daily life and should not be ignored, especially if they persist or worsen.

How to Interpret Gastrin Test Results

A fasting gastrin level below 100 pg/mL is typical for adults. If your tests show significantly higher gastrin levels, especially alongside acidic stomach contents, it may suggest a gastrin-secreting tumor like those seen in Zollinger-Ellison syndrome. It's important to discuss these results with your healthcare provider, who may recommend further testing or treatment.

Frequently asked questions

What is considered a high gastrin level?
A fasting gastrin level above 100 pg/mL is considered high. This could indicate an underlying condition that needs medical attention.

Can diet affect gastrin levels?
Yes, certain foods and medications can influence gastrin levels. For example, high-protein meals and medications like proton pump inhibitors can lead to increased gastrin secretion.

What tests are used to diagnose high gastrin levels?
A blood test measuring gastrin levels is the primary test. Additional tests, such as imaging or endoscopy, may be used to identify underlying causes like tumors.

When to see a doctor

If you experience persistent symptoms such as abdominal pain, diarrhea, or unexplained nausea, consider consulting a healthcare professional. Elevated gastrin levels, especially if markedly high, warrant further investigation to rule out serious conditions like Zollinger-Ellison syndrome.

Decisions about your health should always be made in partnership with your healthcare provider.