What Are Esophageal Varices and Why Do They Bleed?

Esophageal varices are swollen, fragile veins in the lower esophagus that develop when blood flow through the liver is obstructed, forcing blood to reroute through smaller vessels that were never built to handle that pressure. They are found in roughly half of all people with liver cirrhosis and represent one of the most dangerous complications of advanced liver disease, because a ruptured varix can cause life-threatening bleeding within minutes.¹ The condition sits at the intersection of liver disease, vascular anatomy, and emergency medicine, and how it is managed has changed substantially over the past two decades.

How Esophageal Varices Form

The liver normally accepts a large volume of blood from the portal vein, which drains the digestive organs. When the liver becomes scarred from cirrhosis, alcohol damage, viral hepatitis, or other chronic insults, blood meets increasing resistance as it tries to pass through. The pressure in the portal system rises, a state called portal hypertension, and the blood seeks alternate routes. Some of those routes run through the veins lining the lower esophagus and the junction between the esophagus and stomach. These veins dilate under the extra load, becoming varices.

Among people with cirrhosis, new varices appear or existing ones worsen at a rate of about 5 to 15 percent per year.² Cirrhosis is by far the most common cause, but it is not the only one. Blood clots in the portal vein, certain parasitic infections, and even conditions that raise pressure from above, such as superior vena cava obstruction, can produce varices without cirrhosis being present at all.³ Recognizing these non-cirrhotic causes matters because the treatment approach and prognosis differ.

What Determines Whether a Varix Ruptures

Not everyone with esophageal varices bleeds. The question of which varices are likely to rupture has driven decades of research. In basic physics terms, the tension on a vessel wall depends on the pressure inside it, the vessel’s radius, and how thick the wall is. A large, thin-walled varix under high pressure faces the most stress.⁴ The catch is that variceal size alone is not a reliable stand-in for wall tension, because the radius of a varix does not consistently track with how thin its wall has become. Two varices that look the same size on endoscopy can have very different wall thicknesses and, therefore, very different rupture risks.⁵

An additional factor that rarely gets discussed outside specialist circles is peristalsis, the normal swallowing contractions of the esophagus. When the esophagus squeezes around a varix, intravariceal pressure spikes. Research using variceal models has shown that when resistance to blood flow at the gastroesophageal junction is high, peristaltic contractions push intravariceal pressure and wall tension significantly upward. In one study, patients whose peak closing pressures exceeded about 61 mmHg during peristalsis were far more likely to bleed.⁶ In clinical practice, doctors still rely on endoscopic appearance, including variceal size and the presence of red markings on the vessel surface, as proxies for rupture risk. But the underlying physics makes clear why those visual markers are imperfect.

Screening and Diagnosis Without Endoscopy

The gold standard for detecting esophageal varices is upper endoscopy, where a flexible camera is passed down the throat. Current guidelines, however, recognize that not every person with cirrhosis needs to go through this procedure immediately. The Baveno VI consensus guidelines state that endoscopy can be safely skipped in patients whose liver stiffness measurement is below 20 kPa and whose platelet count is above 150,000 per microliter, because varices needing treatment are rare in that group.⁷⁸

Liver stiffness is measured using a quick, painless ultrasound-based technique called transient elastography. In patients with hepatitis C-related cirrhosis, a stiffness reading of 23.1 kPa or higher detected varices with about 94 percent sensitivity. Spleen size and a scoring system that combines age, liver enzymes, and platelet count also showed high sensitivity for predicting varices, while a platelet count above roughly 112,500 helped rule them out.⁹ These non-invasive tools are not perfect replacements for endoscopy, but they help doctors triage who genuinely needs the scope and who can be monitored with blood tests and imaging.

When Varices Bleed

A variceal bleed is a medical emergency. The initial management involves stabilizing the patient, starting medications to reduce portal pressure, and performing urgent endoscopy to stop the bleeding. How this sequence plays out in the first few hours shapes survival.

Blood Transfusion Strategy

One of the most counterintuitive findings in this field is that giving less blood during a variceal bleed tends to produce better outcomes than giving more. A landmark trial comparing a restrictive transfusion strategy (transfusing only when hemoglobin dropped below 7 g/dL) with a liberal one (transfusing below 9 g/dL) found that six-week survival was higher in the restrictive group: 95 percent versus 91 percent. Rebleeding was also less common, and portal pressure actually rose in the liberal-transfusion group but not in the restrictive group.¹⁰ The likely explanation is that aggressive transfusion pushes portal pressure back up, worsening the very problem that caused the bleed. A large retrospective analysis of U.S. hospital data over 20 years reinforced the concern, finding that red blood cell transfusion in variceal bleeders was associated with a 22 percent increase in inpatient mortality.¹¹ Not every subsequent trial has shown as clear a survival difference, but the direction of evidence consistently favors restraint.¹²

Vasoactive Drugs

Before the endoscope reaches the patient, intravenous drugs that constrict the blood vessels feeding the portal system are started. These vasoactive agents, including terlipressin, octreotide, and somatostatin, reduce blood flow into the varices and lower portal pressure. Across multiple trials, using any of these drugs lowered seven-day mortality by about a quarter, improved the rate of initial bleeding control, and shortened hospital stays compared with no vasoactive drug at all.¹³ Head-to-head comparisons between individual agents have generally found similar effectiveness, though terlipressin compared to using no drug at all significantly improved bleeding control within 48 hours and reduced in-hospital mortality.¹⁴ A real-world comparison of terlipressin and octreotide found no meaningful differences in bleeding control, hospital stay, or six-week mortality.¹⁵

Antibiotics During a Bleed

People with cirrhosis are vulnerable to bacterial infections, and a variceal bleed makes that risk worse. Starting antibiotics early, even before endoscopy, reduces infection rates and improves outcomes. Short courses of fluoroquinolones like ciprofloxacin or norfloxacin have the strongest evidence. In hospitals where antibiotic-resistant bacteria are common, intravenous ceftriaxone is preferred, especially for patients with more advanced liver disease.¹⁶

Endoscopic Treatment

Once the bleeding source is confirmed on endoscopy, the standard intervention is band ligation: small rubber bands are placed around the base of the varix, strangling it so it clots off and eventually sloughs away. An older technique, sclerotherapy, involves injecting a chemical irritant directly into the varix to scar it shut. Both achieve similar rates of variceal eradication in acute settings, and short-term survival looks comparable.¹⁷ Band ligation has largely replaced sclerotherapy in routine practice, though, because it achieves eradication in fewer sessions and carries lower complication rates.¹⁸

When standard endoscopic treatment and drugs fail to stop the bleeding, the situation becomes refractory. Historically, balloon tamponade, where a tube with an inflatable balloon is placed in the esophagus to physically compress the varices, was the bridge to more definitive therapy. Self-expanding metal stents designed for the esophagus have now emerged as a better option in this dire scenario. In a controlled trial, esophageal stents controlled bleeding in 85 percent of cases compared with 47 percent for balloon tamponade, with lower rates of serious adverse events.¹⁹

Preventing the First Bleed

For someone who has varices that have never bled, the goal is to keep it that way. Non-selective beta-blockers, the same class of blood pressure medication your grandmother might take, are the cornerstone. These drugs reduce the heart rate and constrict certain blood vessels, lowering the amount of blood flowing into the portal system. A network meta-analysis comparing different beta-blockers found that nadolol ranked first for reducing first variceal bleeds, followed by carvedilol and then propranolol, all significantly better than placebo.²⁰ Carvedilol has gained popularity because it also lowers resistance within the liver’s blood vessels, potentially giving it a dual mechanism of action.

Band ligation is an alternative for patients who cannot tolerate beta-blockers, which can cause fatigue, dizziness, or dangerously low blood pressure in people with advanced cirrhosis. The choice between medication and ligation for primary prevention depends on the individual patient’s liver function, blood pressure, and variceal size.

Preventing Rebleeding After the First Episode

Once someone has survived a variceal bleed, the risk of it happening again is high enough that aggressive prevention is standard. Combining endoscopic band ligation with beta-blocker therapy works better than either approach alone. A meta-analysis showed that combination therapy reduced overall rebleeding by about 30 percent compared with endoscopic treatment alone and by about 29 percent compared with beta-blockers alone.²¹ This dual approach is now considered first-line for secondary prevention.²²

For patients who rebleed despite combination therapy, a transjugular intrahepatic portosystemic shunt, or TIPS, becomes the next step. TIPS is a procedure where a radiologist threads a catheter through the jugular vein into the liver and places a small stent that creates a new channel for blood to bypass the scarred liver tissue, directly lowering portal pressure. Meta-analyses consistently show TIPS is superior to endoscopic or drug therapy at preventing rebleeding, and it was associated with a significant reduction in one-year mortality in one pooled analysis.²³²⁴

The trade-off with TIPS is hepatic encephalopathy, a condition where toxins the liver normally clears, especially ammonia, build up and cause confusion, personality changes, and in severe cases, coma. Rates of encephalopathy after TIPS have been significantly higher than with standard care in several trials, with one study reporting 46 percent versus 21 percent.²⁵ This is why TIPS is generally reserved for people who have failed other treatments rather than used as a first move. The advent of TIPS and improvements in endoscopic technique have also steadily reduced the number of patients who need open surgical shunts, which were once the mainstay for refractory variceal bleeding.²⁶

Gastric Varices and How They Differ

Esophageal varices get most of the attention, but varices can also develop in the stomach. The two share a root cause in portal hypertension but differ in important ways. Esophageal varices form in the superficial layers of the esophageal wall, while gastric varices tend to sit deeper in the stomach’s submucosal layer. Fundal varices, those in the top of the stomach, develop as part of a different vascular pathway altogether and can grow to a much larger caliber. When a fundal varix ruptures, the bleeding tends to be more massive and harder to control with standard banding or injection.²⁷ Specialized techniques, including injecting tissue adhesives like cyanoacrylate glue and a procedure called balloon-occluded retrograde transvenous obliteration, have been developed specifically for gastric varices because conventional endoscopic banding often is not enough.

Esophageal Varices in Children

Varices are not exclusively an adult problem. Children with conditions like biliary atresia, a congenital blockage of the bile ducts that leads to progressive liver damage, can develop significant esophageal varices. In these young patients, grade III (large) varices and the presence of red color signs on their surface are risk factors for bleeding, along with low fibrinogen levels, a clotting protein.²⁸ Endoscopic band ligation appears to be well tolerated in children and significantly reduces bleeding risk when used as either primary or secondary prevention. The caveat is that varices tend to recur in children, so ongoing endoscopic monitoring is necessary even after successful treatment.²⁹

Statins as an Emerging Add-On Therapy

One of the more intriguing recent developments is the potential role of statins, drugs best known for lowering cholesterol, in managing portal hypertension. Statins appear to improve blood vessel function within the liver and reduce the resistance that drives portal pressure up. In a randomized trial, simvastatin lowered the portal pressure gradient by about 8 percent, while placebo had no meaningful effect. Roughly a third of patients on simvastatin achieved a clinically meaningful pressure reduction, compared with about 11 percent on placebo.³⁰ Early human data also suggest that adding a statin to standard therapy after a variceal hemorrhage may reduce death rates among patients with decompensated cirrhosis.³¹ Statins are not yet part of standard variceal management guidelines, but the signal is strong enough that large clinical trials are underway to settle the question.

Living With the Diagnosis

Beyond the medical interventions, the psychological burden of esophageal varices is real and often underappreciated. Most patients with cirrhosis who undergo procedures for variceal bleeding experience significant anxiety and depression, which can interfere with recovery and adherence to follow-up care.³² Structured self-management programs that combine patient education, dietary guidance, medication adherence support, and psychological counseling have been shown to improve quality of life scores compared with standard care.³³ Practical matters like knowing how to recognize signs of a bleed (vomiting blood, black tarry stools, sudden lightheadedness), understanding why alcohol avoidance is non-negotiable for those with alcoholic liver disease, and keeping up with repeat endoscopies and beta-blocker prescriptions are the daily reality of managing this condition. The medical side of variceal care has become remarkably sophisticated, but the human side still relies on patients being informed, supported, and connected to care teams who treat the whole person.