GAVE disease, short for gastric antral vascular ectasia, is a condition where blood vessels in the lower part of the stomach become dilated and fragile, causing chronic bleeding. It’s often called “watermelon stomach” because the damaged blood vessels form visible red stripes that radiate outward from the stomach’s exit, resembling the markings on a watermelon rind. GAVE most commonly affects older adults and leads to slow, ongoing blood loss that can result in iron deficiency anemia.
What Happens Inside the Stomach
The stomach normally moves food toward the small intestine through rhythmic muscular contractions. In GAVE, these contractions become disordered, and the lower portion of the stomach lining repeatedly pushes against the pylorus (the muscular valve at the stomach’s exit). This mechanical stress damages the tiny blood vessels in the stomach wall over time, causing them to widen and weaken.
The disordered movement may stem from damage to the nerves that control digestion. When the autonomic nervous system loses its ability to coordinate stomach contractions properly, the resulting abnormal motion puts repeated strain on the tissue. Under a microscope, GAVE tissue shows widened capillaries plugged with small blood clots, overgrowth of the surface lining, and thickening of the muscle fibers in the stomach wall. These changes confirm the ongoing cycle of mechanical injury and attempted repair.
How GAVE Looks on Endoscopy
Doctors diagnose GAVE during an upper endoscopy, where a camera is passed into the stomach. The condition has two distinct visual patterns, and which one appears depends partly on the patient’s underlying health.
- Watermelon pattern: Red lesions grouped in long stripes radiating from the pylorus. This classic appearance is more common in women, particularly those with connective tissue diseases like scleroderma. It tends to cause slow, hidden bleeding rather than dramatic episodes.
- Punctate (scattered dot) pattern: Widespread reddish spots spread across the lower stomach without a striped arrangement. This pattern is more common in men with liver cirrhosis and is more likely to cause severe, overt bleeding.
When the visual appearance isn’t conclusive, a biopsy helps confirm the diagnosis. Pathologists look for three key features: widened blood vessels with tiny clots inside them, proliferation of spindle-shaped smooth muscle cells, and a process called fibrohyalinosis where connective tissue thickens around the damaged vessels. A formal scoring system combines these three findings, and a score of 3 or higher (out of 5) is considered the best indicator of GAVE on biopsy. This scoring system achieves about 85% accuracy in distinguishing GAVE from conditions that look similar.
Symptoms and What They Feel Like
Most people with GAVE don’t experience sudden, dramatic bleeding. Instead, the fragile blood vessels ooze small amounts of blood into the stomach continuously. Over weeks or months, this hidden blood loss depletes iron stores and drops red blood cell counts. The symptoms that bring people to a doctor are typically those of anemia: fatigue, shortness of breath with mild exertion, pale skin, and lightheadedness.
Some people do pass dark, tarry stools (a sign of digested blood) or occasionally vomit blood. In the punctate pattern associated with liver disease, bleeding episodes can be more acute and severe, sometimes requiring emergency blood transfusions.
Conditions Linked to GAVE
GAVE rarely appears in isolation. It clusters with two major categories of disease: liver cirrhosis and autoimmune conditions, particularly systemic sclerosis (scleroderma).
Among patients with scleroderma, a large retrospective study of 264 patients found that about 5.7% had clinically obvious GAVE. But when researchers performed routine endoscopies on scleroderma patients who had no symptoms, the prevalence jumped to 22.3%, suggesting many cases go undetected. Scleroderma damages connective tissue throughout the body, and in the stomach, this likely contributes to the nerve dysfunction and abnormal motility that drives GAVE.
In patients with cirrhosis, GAVE can be especially tricky to identify because it overlaps with another bleeding condition called portal hypertensive gastropathy. The two require different treatments, making accurate diagnosis important.
GAVE vs. Portal Hypertensive Gastropathy
Portal hypertensive gastropathy (PHG) is the condition most commonly confused with GAVE, especially in patients who have liver disease. Both cause visible changes to the stomach lining and can lead to bleeding, but they are fundamentally different problems with different treatments.
PHG is caused by high pressure in the portal vein (the major blood vessel draining the gut to the liver). It creates a mosaic-like, snakeskin pattern across the upper stomach, mainly in the body and fundus. GAVE, by contrast, involves the lower stomach (the antrum) and does not require portal hypertension to develop. PHG tissue shows dilated veins without blood clots or inflammation. GAVE tissue shows clotted capillaries, spindle cell proliferation, and fibrohyalinosis.
This distinction matters because PHG improves when portal pressure is reduced (for example, after a liver transplant or a procedure to reroute blood flow), while GAVE does not respond to those interventions and needs direct treatment of the bleeding vessels.
How GAVE Is Treated
The first-line treatment for GAVE is endoscopic therapy, where a doctor uses a scope to directly seal the bleeding vessels. The most common technique uses a jet of ionized argon gas (argon plasma coagulation) to cauterize the abnormal tissue. This is done during a standard endoscopy and doesn’t require surgery. Most patients need multiple sessions, typically spaced weeks apart, to control bleeding and stabilize their blood counts. Iron supplements and sometimes blood transfusions are used alongside endoscopic treatment to manage anemia while the bleeding vessels are being addressed.
GAVE can be stubborn. The abnormal vessels often regrow after treatment, requiring repeat sessions over months or even years. For some patients, endoscopic therapy eventually stops working well enough to keep up with the blood loss.
When Endoscopy Isn’t Enough
For patients with refractory GAVE, meaning the bleeding keeps returning despite repeated endoscopic treatments, doctors may try medications that reduce blood vessel growth. Several drugs have been used in small studies or case reports, including hormonal therapies, a drug that slows blood vessel formation (thalidomide), and medications that reduce blood flow to the gut.
In one reported case, an 84-year-old woman with cirrhosis and GAVE visited the emergency department seven times in six months for vomiting blood, received 15 units of transfused blood, and underwent five endoscopic treatments, all without lasting improvement. After starting on a medication to inhibit new blood vessel growth, she had no recurrence of bleeding over the following six months and her blood counts stabilized. While promising, these medications carry significant side effects and are reserved for cases where standard treatment has failed.
Surgical removal of the lower stomach (antrectomy) is the most definitive treatment, since it eliminates the tissue where GAVE develops. However, it carries meaningful surgical risk, particularly in elderly patients and those with liver disease or other serious conditions. Surgery is generally considered a last resort when all other options have been exhausted.