Zollinger-Ellison Syndrome
Acid-producing tumors that cause severe, recurring ulcers
Quick Facts
- Type: Rare digestive and hormonal disorder
- Cause: Gastrin-secreting tumors (gastrinomas)
- Main effect: Excess stomach acid and ulcers
- Treatment: High-dose acid blockers, sometimes surgery
Overview
Zollinger-Ellison syndrome (ZES) is a rare condition in which one or more tumors form in the pancreas or the upper part of the small intestine (the duodenum). These tumors, called gastrinomas, release large amounts of the hormone gastrin. Gastrin signals the stomach to make acid, so the result is far more stomach acid than the body needs.
The flood of acid damages the lining of the stomach and intestine, causing peptic ulcers that are often severe, multiple, and slow to heal. ZES can occur on its own or as part of an inherited condition called multiple endocrine neoplasia type 1 (MEN1). Although the syndrome is uncommon, recognizing it is important because ordinary ulcer treatment often is not enough.
Symptoms
Symptoms come from excess acid and the ulcers it causes:
- Burning or gnawing pain in the upper abdomen
- Ulcers that keep coming back or do not heal with standard treatment
- Chronic diarrhea, sometimes the first noticeable symptom
- Heartburn and acid reflux
- Nausea, vomiting, and loss of appetite
- Unintended weight loss
Severe complications such as bleeding ulcers or a perforation can cause vomiting blood, black tarry stools, or sudden severe abdominal pain. These are emergencies that need immediate care.
Causes
Zollinger-Ellison syndrome is caused by gastrinomas, tumors that produce the hormone gastrin. Most form in the pancreas or duodenum. These tumors can be slow-growing, but some are cancerous and may spread, most often to the liver.
In roughly a quarter of cases, ZES is part of multiple endocrine neoplasia type 1 (MEN1), an inherited condition in which tumors develop in several hormone-producing glands. In the remaining cases the tumors arise on their own without a clear inherited cause.
Risk Factors
- A personal or family history of multiple endocrine neoplasia type 1 (MEN1)
- Family members with hormone-producing tumors of the pancreas, pituitary, or parathyroid glands
- A history of severe or recurrent peptic ulcers without a clear cause such as H. pylori or NSAIDs
ZES is rare and most people with ulcers do not have it; the syndrome is usually considered when ulcers are unusually severe, multiple, or persistent.
Diagnosis
Diagnosis combines blood tests, measurements of stomach acid, and imaging to find the tumor:
- Gastrin blood test: A fasting blood level of gastrin is measured; a markedly high level raises suspicion of ZES.
- Stomach acid testing: Confirming that the stomach is overproducing acid helps distinguish ZES from other causes of high gastrin.
- Stimulation tests: A medication may be given to see how gastrin levels respond.
- Imaging: Specialized scans, endoscopic ultrasound, CT, or MRI are used to locate the tumors and check whether they have spread.
Treatment
Treatment has two goals: controlling the excess acid and addressing the tumors themselves.
- High-dose acid-blocking medication: Proton pump inhibitors are very effective at reducing acid and healing ulcers, and are usually the foundation of treatment.
- Surgery: If the tumor can be located and has not spread, removing it may cure the condition or greatly reduce acid production.
- Treating spread: When tumors have spread, options may include medications, procedures targeting the liver, or other cancer treatments to slow growth and control symptoms.
With effective acid control, ulcer symptoms usually improve substantially, and long-term follow-up is important to monitor the tumors.
Prevention
Zollinger-Ellison syndrome cannot be prevented because the tumors arise without a known avoidable cause. For people with a family history of MEN1, the focus is on early detection.
- Genetic counseling and testing may be offered to families affected by MEN1
- Regular monitoring of hormone levels can detect tumors early in at-risk individuals
- Taking acid-blocking medication consistently helps prevent ulcer complications
When to See a Doctor
See a doctor if you have stomach ulcers that keep returning, persistent unexplained diarrhea, or ongoing upper abdominal pain despite treatment. Seek emergency care immediately for:
- Vomiting blood or material that looks like coffee grounds
- Black, tarry, or bloody stools
- Sudden, severe abdominal pain
- Feeling faint or short of breath, which may signal internal bleeding
Frequently Asked Questions
What causes Zollinger-Ellison syndrome?
It is caused by tumors called gastrinomas, usually in the pancreas or duodenum, that release excess gastrin. This drives the stomach to make too much acid, leading to ulcers and diarrhea. In some people it is part of an inherited condition called MEN1.
How is Zollinger-Ellison syndrome different from a regular ulcer?
Ordinary peptic ulcers usually come from H. pylori infection or NSAID painkillers and heal with standard treatment. ZES ulcers are driven by tumor-related acid overproduction, so they are often multiple, severe, and keep returning despite usual therapy.
Is Zollinger-Ellison syndrome cancer?
The gastrinomas can be noncancerous or cancerous, and some spread, most often to the liver. Even slow-growing tumors are monitored closely. The acid overproduction itself is treated with strong acid-blocking medication regardless of the tumor type.
Can Zollinger-Ellison syndrome be cured?
If the tumor can be found and surgically removed before it spreads, the condition may be cured. When tumors have spread, treatment focuses on controlling acid and slowing tumor growth, and many people do well with long-term acid-blocking medication.
What are the warning signs of a complication?
Vomiting blood, black or tarry stools, or sudden severe abdominal pain can signal a bleeding or perforated ulcer. These are emergencies, so seek immediate medical care if they occur.
References
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Zollinger-Ellison Syndrome.
- Mayo Clinic. Zollinger-Ellison syndrome — Symptoms and causes.
- MedlinePlus, U.S. National Library of Medicine. Zollinger-Ellison syndrome.
- National Cancer Institute (NCI). Pancreatic Neuroendocrine Tumors.