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Mallory-Weiss syndrome (MWS) is a frequent but often overlooked cause of nonvariceal upper gastrointestinal bleeding. The condition results from longitudinal mucosal tears, usually at the esophagogastric junction, produced by sudden rises in intra-abdominal pressure during vomiting, retching, or coughing. Alcohol use, hiatal hernia, and conditions associated with recurrent emesis are recognized risk factors. The underlying mechanism involves a sudden increase in intragastric pressure against the lower esophagus, producing longitudinal mucosal and submucosal tears with subsequent bleeding. Hematemesis is the predominant clinical manifestation, often but not invariably preceded by repeated retching. Melena, hematochezia, dizziness, or syncope may indicate more severe blood loss. Diagnosis relies on upper endoscopy, which typically demonstrates linear lacerations at or near the esophagogastric junction. Endoscopic therapy is indicated for persistent or severe hemorrhage. Volume resuscitation and transfusion may be necessary in unstable patients with complications, including recurrent bleeding or hypovolemic shock. The prognosis is generally favorable with timely recognition and evidence-based management. This activity for healthcare professionals is designed to equip clinicians with essential tools for evaluating and managing MWS. Participants will deepen their understanding of the condition's etiology, risk factors, pathophysiology, clinical features, and guideline-based diagnostic evaluation and management approaches. Enhanced expertise will support efficient collaboration among interprofessional teams caring for individuals experiencing MWS. Objectives: Identify the signs and symptoms indicative of Mallory-Weiss syndrome. Develop diagnostic protocols to confirm the presence of Mallory-Weiss syndrome, determine its severity, and monitor disease progression. Implement evidence-based, personalized strategies for managing Mallory-Weiss syndrome, preventing its recurrence, and mitigating its potential complications. Collaborate with interprofessional team members, including gastroenterologists, emergency physicians, nurses, endoscopy technicians, surgeons, and interventional radiologists, to deliver timely, coordinated, and comprehensive care for patients with Mallory-Weiss syndrome. Access free multiple choice questions on this topic.

Mallory-Weiss syndrome (MWS) is recognized as one of the causes of nonvariceal upper gastrointestinal haemorrhage, accounting for 3% to 10% of cases.[1][2][3][4][5] First described in 1929 by Kenneth Mallory and Soma Weiss, MWS is defined by superficial, longitudinal mucosal lacerations at the esophagogastric junction.[6] These tears result from a sudden increase in intra-abdominal pressure, typically induced by recurrent vomiting, forceful retching, or severe coughing. Although traditionally associated with alcohol use, MWS may also occur in the setting of pregnancy, eating disorders, or endoscopic procedures. The diagnosis of MWS should be considered in patients with upper gastrointestinal bleeding preceded by vomiting of clear fluid or bile, followed by hematemesis. Confirmation is achieved by esophagogastroduodenoscopy (EGD), which enables direct visualization of the mucosal tear and therapeutic hemostasis when indicated. Most Mallory-Weiss tears, reported in up to 90% of cases, resolve spontaneously without endoscopic or other intervention. The rebleeding rate after successful hemostasis is approximately 7%, typically occurring within 24 hours of the initial procedure.[7][8] Optimal care requires an interprofessional approach, with timely recognition of risk factors and coordinated management essential for reducing recurrence and preventing complications.

Excessive and chronic alcohol use is the most common risk factor for MWS, identified in 50% to 70% of cases.[9] Alcohol promotes vomiting, damages the gastrointestinal mucosa, and alters esophageal motility. Hemorrhage is typically more severe in the setting of portal hypertension and esophageal varices.[10] Additional factors such as gastroesophageal reflux and gastroparesis compromise mucosal integrity and increase intragastric pressure, thereby predisposing to mucosal tears. In a 10-year analysis of MWS cases in Germany, reflux esophagitis was the most frequent comorbidity (23.6%), followed by hiatal hernia (19.7%), although the latter does not appear to confer independent risk.[11][12] Approximately 20% of patients present without an identifiable risk factor.[13] Mallory-Weiss tears are most often preceded by vomiting, which may be associated with metabolic disorders, including diabetic ketoacidosis and renal failure, hyperemesis gravidarum, eating disorders such as anorexia nervosa and bulimia nervosa, gastroenteritis, upper gastrointestinal luminal stenosis, trichobezoars, chemotherapy, and intracranial hypertension.[14][15][16] Other precipitating factors include coughing, lifting, straining, seizures, and iatrogenic causes such as nasogastric tube placement. MWS may occur as a complication of endoscopic gastrointestinal procedures, with an incidence of 5.4%, or following transesophageal echocardiography, with reported rates of 0.07% to 0.49%.[17][18] The frequency of endoscopy-associated tears appears reduced when deep sedation or general anesthesia is employed. Although rare, MWS has been reported after Roux-en-Y gastric bypass, where diagnosis is often delayed because of limited endoscopic access to the excluded stomach.[19] Marked increases in intra-abdominal pressure, such as those occurring during cardiopulmonary resuscitation, may also precipitate MWS.[20] The use of nonsteroidal anti-inflammatory drugs (NSAIDs) and anticoagulants does not increase the risk of tear formation but exacerbates bleeding severity and complicates hemostatic management.[21]

The incidence of MWS varies by geographic region and diagnostic methods. The condition accounts for 3% to 10% of nonvariceal upper gastrointestinal hemorrhage and is more prevalent in populations with high alcohol consumption. Younger individuals are affected more frequently, with a higher incidence in male patients than in female patients. In the U.S., MWS is most often identified in hospitalized adults between 40 and 60 years of age, with a mean age of 56 years. Approximately 72% of cases occur in men.

The precise mechanism of MWS remains incompletely defined but reflects a complex interplay of mechanical and mucosal factors.[22] A sudden rise in intra-abdominal and intragastric pressure, triggered by forceful vomiting or persistent singultus, places stress on the esophageal mucosa. Opposing muscle contractions generate shear forces, and gastric contents may be propelled into the esophagus, producing lacerations. MWS most often presents with a single longitudinal mucosal tear, although multiple or circumferential lesions have been described. Most lacerations remain confined to the mucosal layer, but extension into deeper tissues may disrupt blood vessels and cause upper gastrointestinal bleeding. Chronic gastroesophageal reflux disease and alcohol-induced mucosal injury reduce tissue resilience and increase susceptibility to tearing.

MWS most often develops after a sudden rise in intra-abdominal pressure due to violent and repeated vomiting, coughing, prolonged singultus, or medical interventions such as cardiopulmonary resuscitation and therapeutic endoscopy. The syndrome typically presents as nonhemorrhagic vomiting followed by hematemesis, indicating mucosal tearing, although bleeding may occur at the onset. Clinical manifestations include hematemesis, melena in prolonged or mild bleeding, hematochezia in severe or persistent hemorrhage, and features of anemia such as pallor, tachycardia, and orthostatic hypotension. Pain is generally absent unless complications develop. Clinical examination is essential for assessing bleeding severity and detecting signs of shock in critical presentations.

MWS should be considered in patients presenting with upper gastrointestinal bleeding, particularly after repeated or forceful vomiting. Initial evaluation must prioritize hemodynamic status. In hemodynamically stable patients, endoscopy should be performed within 12 hours of hospital admission. Unstable patients require resuscitation before undergoing endoscopy, which should ideally be performed within 24 hours of stabilization.[23][24][25] The characteristic endoscopic finding in MWS is a longitudinal mucosal tear at or near the esophagogastric junction, most often in the cardia along the lesser curvature of the stomach, or less commonly on the posterolateral right wall of the distal esophagus.[26] Tears typically measure 1 to 2 cm and remain confined to the mucosa or submucosa. A solitary lesion is identified in approximately 90% of cases, although multiple or more extensive lacerations may occur (see Image. Mallory-Weiss Syndrome on Esophagoscopy).[27] EGD also excludes alternative sources of upper gastrointestinal bleeding, such as gastroduodenal ulcers and esophageal varices, identifies stigmata of recent or active hemorrhage, and determines the need for hemostatic intervention. Computed tomography angiography may be warranted when complications are suspected or endoscopy is contraindicated. Laboratory evaluation is also essential, including a complete blood count to assess the degree of blood loss, coagulation studies to determine bleeding risk from underlying disease or anticoagulant use, and renal and liver function tests to evaluate for comorbidities.

Therapeutic strategies for MWS depend on the presence of active bleeding or hemodynamic stability. Hemorrhage is mild and self-limited in most cases, making conservative medical management sufficient. Patients with ongoing bleeding, endoscopic stigmata such as a visible vessel or adherent clot, or comorbidities including cirrhosis or cardiovascular disease require endoscopic or other hemostatic intervention. When EGD reveals no active hemorrhage, high-dose proton pump inhibitors (PPIs) should be initiated to promote mucosal healing and reduce recurrence risk. Endoscopic therapy is not indicated in this setting. Antiemetics such as ondansetron or promethazine may be administered to control vomiting. In cases of active hemorrhage, management should begin at admission with rapid assessment of clinical severity and hemodynamic status. Shock requires immediate fluid resuscitation, with volume replacement and blood transfusion indicated when hemoglobin is below 8 g/dL. Intravenous PPIs should be administered as an 80-mg bolus followed by continuous infusion. Upper gastrointestinal endoscopy should be performed within 12 to 24 hours. Endoscopic hemostatic therapy is the recommended 1st-line intervention for active bleeding. Hemostasis is achieved in more than 90% of cases, with a significant reduction in rebleeding risk compared to medical therapy and a low complication rate. Techniques used alone or in combination include epinephrine injection, multipolar electrocoagulation, argon plasma coagulation, hemostatic clipping, and endoscopic band ligation (see Image. Endoscopic View of Hemoclip Application for Bleeding Control).[28] Mechanical methods such as clipping and band ligation demonstrate greater efficacy than injection alone for achieving initial hemostasis and preventing rebleeding.[29][30] Hemostatic powder spray may be employed as a salvage measure when conventional therapies fail.[31] Postendoscopic management parallels that of other causes of upper gastrointestinal bleeding.[32] In the absence of endoscopic stigmata of recent bleeding (eg, active bleeding, adherent clot, or nonbleeding visible vessel), oral PPI therapy should be initiated and antiemetics administered upon recovery from sedation. Such patients may be discharged with instructions to seek immediate care in the event of recurrent bleeding. Mild-to-moderate active bleeding warrants hospitalization.

Postendoscopic management parallels that of other causes of upper gastrointestinal bleeding.[32] In the absence of endoscopic stigmata of recent bleeding (eg, active bleeding, adherent clot, or nonbleeding visible vessel), oral PPI therapy should be initiated and antiemetics administered upon recovery from sedation. Such patients may be discharged with instructions to seek immediate care in the event of recurrent bleeding. Mild-to-moderate active bleeding warrants hospitalization. Patients with risk factors for rebleeding (eg, portal gastropathy, coagulopathy, anticoagulant use), severe bleeding at presentation, advanced age, or comorbidities in which rebleeding poses a high risk of life-threatening complications (eg, chronic obstructive pulmonary disease, coronary artery disease, cerebrovascular disease, chronic kidney disease) are generally admitted for observation and given an intravenous PPI infusion for up to 72 hours. Both discharged and hospitalized patients may begin a clear liquid diet, advancing to a full diet if stable for 24 hours. Repeat endoscopy for MWS after successful hemostasis is indicated only in the event of recurrent bleeding. If endoscopic therapy fails, arterial embolization is an effective alternative for the localization and control of active bleeding. Surgical oversewing of the mucosal tear is rarely required and is seldom performed, given the effectiveness of contemporary endoscopic techniques.[33] Patient monitoring and education remain essential, particularly in severe or high-risk cases, with targeted management of comorbidities and modifiable factors such as alcohol use, NSAID exposure, and recurrent vomiting (see Image. Diagnostic and Therapeutic Algorithm for Mallory-Weiss Syndrome).

Other causes of upper gastrointestinal bleeding must be systematically excluded, such as the following: Esophageal varices associated with portal hypertension, often causing hemorrhage without preceding vomiting and potentially coexisting with MWS in alcoholic cirrhosis [34] Boerhaave syndrome, a transmural esophageal rupture that may progress to mediastinitis Bleeding peptic ulcer Pill-induced erosive esophagitis Infectious esophagitis (eg, due to Candida, cytomegalovirus, or herpes virus) Lye or other caustic injury Esophagogastric tumors [35] Vascular lesions, including Dieulafoy lesions and angiodysplasias Systematic exclusion of differential diagnoses is critical, as management strategies vary considerably. Integration of clinical history, EGD findings, and laboratory data provides the foundation for accurate diagnosis and effective therapy.

The prognosis of MWS is generally favorable. However, the risk of complications and mortality increases in the presence of advanced age, initial hypovolemic shock, persistent or recurrent bleeding, coagulopathy, acute kidney injury, or chronic liver disease.[36]

Serious complications, such as massive or recurrent hemorrhage and perforation, are uncommon. In rare instances, mucosal tears may progress to transmural rupture, necessitating emergency surgical intervention.[37]

Bleeding in MWS is generally self-limited or readily managed with endoscopic interventions, although recurrence may occur if predisposing factors are not adequately addressed. Patients should be informed of contributing factors and interventions that reduce the risk of recurrence. Support for alcohol withdrawal should be provided, with referral to addiction specialists when appropriate. Use of NSAIDs or anticoagulants should be reassessed, with PPIs prescribed for gastric protection if discontinuation is not feasible. Patients with risk factors for recurrent vomiting, including pregnancy and chemotherapy, should receive prompt antiemetic treatment to minimize mucosal stress. Regular follow-up should be ensured for individuals with comorbidities, such as coagulation disorders or chronic liver disease, which are associated with increased recurrence risk.

Effective management of MWS requires structured coordination supported by standardized interprofessional protocols and clear communication among healthcare providers. Management should be based on unified guidelines that delineate the roles of emergency medicine physicians, gastroenterologists, nurses, and endoscopy technicians. Surgeons and interventional radiologists may be involved when therapeutic endoscopy does not achieve definitive hemostasis. A coordinated approach facilitates rapid intervention, enables timely endoscopy, shortens hospitalization, and reduces the risk of recurrence. Interprofessional collaboration improves clinical performance and outcomes in gastrointestinal hemorrhage management.[38][39] Continuous training is critical to reinforce integrated education, enhance team coordination, and optimize patient care.