Are Cameron Lesions Fatal? Assessing the Risk

Cameron lesions are rarely fatal when identified and treated promptly, but they carry a real risk of life-threatening complications if they go unrecognized. These erosions form on the stomach lining where a hiatal hernia squeezes through the diaphragm, and their danger comes less from the lesions themselves than from what happens when chronic bleeding or, in rare cases, perforation goes unaddressed for months or years. The challenge is that Cameron lesions are frequently missed on endoscopy, sometimes repeatedly, which allows slow blood loss to progress to severe anemia or sets the stage for an acute crisis.

What Cameron Lesions Actually Are

Cameron lesions are shallow erosions or ulcers that develop on the gastric folds at the neck of a hiatal hernia, most commonly along the lesser curvature of the stomach. They sit right at the point where the stomach slides up through the diaphragmatic opening, and they tend to be linear or oblong in shape rather than round like a typical stomach ulcer.¹ They are not caused by acid reflux or peptic disease in the usual sense, which is part of why they are so often overlooked. They only occur in patients who have a hiatal hernia, and they are most associated with large hernias.

The leading explanation for why these erosions form is mechanical trauma. As the diaphragm contracts during breathing, the gastric folds that sit at the hernia neck get pinched and rubbed repeatedly against the edges of the hiatal opening. Over time, that friction damages the mucosal lining. Some researchers also point to localized ischemia, where the diaphragm’s compression reduces blood flow to the trapped tissue, and to acid injury that compounds the damage once the surface is already compromised.² The result is erosions that bleed slowly but persistently, or in some cases ulcers deep enough to cause more dramatic problems.

How Cameron Lesions Become Dangerous

The most common way Cameron lesions threaten health is through chronic, occult bleeding. “Occult” here just means the bleeding is too slow to notice in your stool or vomit. Instead, over weeks and months, you gradually lose enough red blood cells to develop iron-deficiency anemia. By the time symptoms like fatigue, shortness of breath, or pallor become obvious, hemoglobin levels can be dangerously low. Cameron lesions have been described as a rare but potentially devastating cause of refractory iron-deficiency anemia, the kind that does not respond to iron supplements alone because the underlying bleed continues.³

Less commonly, Cameron lesions can cause acute upper gastrointestinal bleeding. Case reports describe patients presenting with vomiting blood and black, tarry stools severe enough to cause hypovolemic shock, a dangerous drop in blood volume. One reported case involved an 87-year-old woman with a known hiatal hernia and atrial fibrillation who arrived in shock from massive bleeding traced to her Cameron ulcers.⁴ Acute episodes like this are uncommon, but when they happen they require emergency intervention.

The rarest and most serious complication is perforation, where the ulcer erodes completely through the stomach wall. One published case involved an 84-year-old woman whose Cameron ulcer perforated in the setting of an incarcerated paraesophageal hernia with gastric volvulus, a condition where the stomach twists on itself. She presented in shock from the perforation.⁵ Perforation is a surgical emergency with a high mortality risk, but it is worth emphasizing that this scenario is exceedingly rare. Most Cameron lesions never progress to this point.

Why Cameron Lesions Are So Often Missed

One of the more frustrating aspects of Cameron lesions is how frequently they escape detection even when doctors are actively looking for a source of bleeding. A systematic review of the literature found that as many as 69% of patients had undergone one or more prior upper endoscopies before their Cameron lesions were finally diagnosed.⁶ That is a striking number. It means the majority of people with these erosions are scoped at least once, told nothing was found, and sent home still bleeding.

The reasons for this are partly anatomical and partly about awareness. Cameron lesions sit on the gastric folds right at the hernia neck, an area that can be difficult to visualize during endoscopy, especially if the endoscopist is not specifically looking for them. The erosions can be shallow and subtle, easy to mistake for normal mucosal folds or to miss entirely if the scope passes through the area too quickly. Additionally, if the clinician is not thinking about Cameron lesions as a possible diagnosis, they may focus on more common causes of anemia like peptic ulcers, gastric tumors, or colorectal bleeding, and overlook the hernia neck entirely.

The same review noted that Cameron lesions have a prevalence of roughly 5 to 9% in patients with iron-deficiency anemia.⁶ That is not vanishingly rare. For anyone with unexplained iron-deficiency anemia and a known hiatal hernia, especially a large one, requesting that the endoscopist specifically examine the hernia neck for Cameron erosions is a reasonable ask. Prompt recognition matters because delayed diagnosis means prolonged anemia and increased risk of complications that could otherwise be avoided.⁷

Who Is Most at Risk

The single strongest risk factor for Cameron lesions is having a large hiatal hernia. In a study comparing hiatal hernia patients with and without Cameron lesions, those with the lesions were far more likely to have a large hernia: about 44% of Cameron lesion patients had large hernias compared to only around 10% of hernia patients without the erosions.⁸ The bigger the hernia, the more gastric tissue gets pinched in the diaphragmatic hiatus, and the more mechanical trauma accumulates on those folds.

NSAID use is the other major risk factor. The same study found that nearly half of Cameron lesion patients were using NSAIDs, compared to about 10% of hernia patients without the lesions.⁸ NSAIDs like ibuprofen and naproxen impair the stomach’s protective mucosal barrier, making already-stressed tissue more vulnerable to erosion. If you have a large hiatal hernia and are taking NSAIDs regularly, you are stacking two independent risk factors on top of each other. Switching to a different class of pain reliever, where possible, is something worth discussing with your doctor.

Age and sex, interestingly, did not differ between hernia patients with and without Cameron lesions in that study. Cameron lesions are typically diagnosed in older adults, but that likely reflects the fact that large hiatal hernias themselves are more common with age, not that aging independently causes the erosions.

Treatment With Medication

First-line treatment for Cameron lesions is medical therapy: high-dose proton pump inhibitors (PPIs) like pantoprazole or omeprazole to suppress stomach acid and give the erosions a chance to heal, combined with iron supplementation to rebuild depleted stores.⁹ Endoscopic intervention may be added when there is active bleeding that needs to be stopped more immediately.¹⁰ In severe cases, blood transfusions are needed to stabilize the patient before other treatments can take effect.

Medical management works for a good proportion of patients, but the evidence suggests it has a ceiling. A systematic review and meta-analysis comparing medical and surgical approaches found that roughly two-thirds of patients treated with PPIs alone achieved resolution of their bleeding and anemia.¹¹ That is encouraging, but it also means about a third of medically treated patients do not get adequate relief. The underlying hiatal hernia is still there, the mechanical friction continues, and the erosions can recur once PPIs are stopped or even while taking them. For people in that situation, surgery becomes the conversation.

When Surgery Becomes Necessary

Surgical repair of the hiatal hernia addresses the root cause of Cameron lesions rather than just suppressing their symptoms. The same meta-analysis found that surgical patients had a 92% resolution rate, significantly better than the roughly 67% rate seen with PPI therapy alone. Average hemoglobin levels improved from about 8.9 g/dL before surgery to about 13.6 g/dL afterward, essentially normalizing from moderately severe anemia to a healthy range.¹¹ In six of the studies included in that analysis, the surgical patients had already failed medical management, meaning surgery was the escalation step after PPIs did not work.

The most common procedures were laparoscopic Nissen or Collis fundoplication, performed in about 40% of surgical cases, and open modified Hill repair in about 22%. Laparoscopic approaches had a substantially lower complication rate (around 15%) compared to open procedures (around 48%), which is consistent with the general surgical trend toward minimally invasive techniques.¹¹ One case report described a patient who was treated with blood transfusions, iron, and PPI infusion and then underwent laparoscopic hiatal hernia repair with mesh reinforcement and a Toupet fundoplication without complications.¹²

Surgery is not a guaranteed cure for anemia, though. A separate study looking specifically at paraesophageal hernia repair found that among 16 patients with Cameron lesions before surgery, 10 (about 63%) had resolution of their anemia afterward.¹³ That is encouraging but not universal, and it highlights that some patients may have additional contributing factors to their anemia beyond the Cameron lesions themselves.

Putting the Fatality Risk in Perspective

The honest picture is that Cameron lesions sit on a spectrum of severity. At one end are the majority of cases: slow, occult bleeding that causes progressive iron-deficiency anemia. This is not immediately life-threatening, but it can become serious over time, especially in older adults with other health conditions. Chronic severe anemia strains the heart, worsens fatigue, and diminishes quality of life. Left completely unaddressed, it can contribute to cardiovascular events. At the other end of the spectrum are the rare acute crises: massive upper GI bleeding causing shock, or the even rarer scenario of perforation. These are genuine emergencies with meaningful mortality risk.

What drives the danger is not the Cameron lesion itself so much as the delay in recognizing it. The 69% re-endoscopy rate before diagnosis means many patients spend months or years with uncontrolled bleeding before anyone figures out where it is coming from. During that time, they may receive repeated blood transfusions, take iron supplements that barely keep pace with losses, and undergo unnecessary procedures looking for a source of bleeding that was there all along, just not seen. Prompt diagnosis and treatment are critical precisely because the condition is so treatable once identified. A person diagnosed early, started on PPIs, and referred for surgical repair if needed has an excellent prognosis.

The Role of NSAIDs and Anticoagulants

Beyond the hernia-size and NSAID-use risk factors already discussed, it is worth flagging how anticoagulant and antiplatelet medications interact with Cameron lesions. Many of the patients described in case reports were on blood thinners or aspirin for other conditions, particularly cardiac ones. The 87-year-old woman who presented in hypovolemic shock from her Cameron ulcers, for instance, had atrial fibrillation, a condition commonly managed with anticoagulants.⁴ These medications do not cause Cameron lesions, but they amplify the bleeding from erosions that are already there. A lesion that might ooze slowly enough to be compensated for in an otherwise healthy person can become a source of rapid blood loss in someone on warfarin or a direct oral anticoagulant.

This creates a clinical bind. The patient needs their anticoagulant to prevent stroke or other thrombotic events, but the anticoagulant is worsening the bleeding from their Cameron lesion. Managing both conditions simultaneously often requires a multidisciplinary approach and sometimes tips the balance toward earlier surgical repair of the hernia, since removing the source of the bleeding makes it safer to continue anticoagulation.

Living With a Large Hiatal Hernia

Not every person with a large hiatal hernia will develop Cameron lesions. The prevalence within hiatal hernia populations varies in the literature, but the erosions are clearly more common in larger hernias and in people using NSAIDs. If you have been told you have a large hiatal hernia, there are a few practical takeaways. First, if you develop unexplained anemia or your iron levels keep dropping despite supplementation, ask your gastroenterologist specifically about Cameron lesions. Mention them by name. Given how often they are missed, self-advocacy matters here. Second, if you are taking NSAIDs regularly, talk to your doctor about alternatives. The combination of a large hernia and chronic NSAID use dramatically increases the odds of developing these erosions. Third, if Cameron lesions are found and medical therapy does not resolve your anemia, surgical repair of the hernia has a strong track record of success and should be considered before the situation becomes more complicated.

The overall picture is reassuring for anyone who has just learned about Cameron lesions or been diagnosed with them. They are treatable, and the vast majority of people who receive appropriate care do well. The fatality risk is real but concentrated in cases where diagnosis is delayed, treatment is inadequate, or a rare complication like perforation occurs. The most dangerous thing about Cameron lesions, in practice, is not knowing you have them.

1
American Journal of Case Reports. A 61-Year-Old Woman with Chronic Iron-Deficiency Anemia Due to a Cameron Lesion and a Response to Oral Application of Combined Poloxamer 407 with Hyaluronic Acid and Chondroitin Sulfate Following Single Treatment with Pantoprazole: A Case Report – Section: Discussion
2
Frontiers in Medicine. A case report of occult Cameron ulcer and a systematic review of the literature – Section: Discussion
3
Journal of Pediatric Surgery Case Reports. A large hiatal hernia with cameron ulcer presenting as refractory sever iron deficiency anemia: A case report – Section: Abstract
4
PubMed Central. Cameron ulcers: an atypical source for a massive upper gastrointestinal bleed
5
PubMed Central. Perforated Cameron’s Ulcer from Incarcerated Paraesophageal Hernia with Gastric Volvulus
6
PubMed. Cameron lesions: A still overlooked diagnosis. Case report and systematic review of literature
7
PubMed Central. Symptomatic Anemia Due to Cameron Lesions: A Case Report
8
PubMed Central. Cameron Lesions in Patients with Hiatal Hernias: Prevalence, Presentation, and Treatment Outcome – Section: Results
9
BMJ Case Reports CP. Cameron lesions: an often overlooked cause of iron deficiency anaemia in patients with large hiatal hernias
10
Annals of Medicine and Surgery. Overt GI bleeding from a Cameron lesion in an Ethiopian with NSAID use: Case report of an unusual condition – Section: Discussion
11
PubMed. Surgical management of hiatal hernia vs medical therapy to treat bleeding Cameron lesions: a systematic review and meta-analysis – Section: RESULTS
12
PubMed Central. A Case of Cameron Lesions: An Overlooked Cause of Anemia in Patients With Gastrointestinal Bleeding and Hiatal Hernia
13
PubMed. Paraesophageal hernia repair: a curative consideration for chronic anemia? – Section: Results