Health condition
Median arcuate ligament syndrome
Median arcuate ligament syndrome (MALS) is compression of the coeliac artery by a diaphragm ligament, causing post-meal upper abdominal pain and weight loss in a small, carefully selected group of patients.
Why trust this guide
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Editorial team
Written by our editorial team from the UK sources listed on each page.
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Sourced from guidance
Checked against current NHS and UK specialist society guidance at the time of review.
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Current for 2026
Reviewed on 2026-09-27 with the next review scheduled for 2027-09-27.
Key facts
The essentials at a glance.
The symptoms to recognise, when to seek help, which specialist to see, and what treatment usually involves.
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Typical symptoms: upper abdominal pain after eating, fear of food, weight loss and sometimes an abdominal bruit
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Diagnosis requires both compression on imaging and a fitting clinical picture; compression alone is common and often harmless
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Specialist: a consultant vascular surgeon, usually after gastroenterology has excluded other causes
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Treatment for confirmed cases is laparoscopic release of the ligament
Understanding the condition
What it is and what happens next.
What causes it, how it is diagnosed, and the treatment routes available in the UK.
What it is and how it feels
The median arcuate ligament is a fibrous arch of the diaphragm that sits above the coeliac artery. In some people it sits low enough to compress the artery, and the surrounding nerve plexus, producing pain after meals, an aversion to eating and gradual weight loss. The diagnostic difficulty is that visible compression on scans is common in people with no symptoms at all.
Diagnosis and treatment routes
Assessment therefore works by exclusion and confirmation: endoscopy and imaging rule out commoner causes, while duplex ultrasound with breathing manoeuvres and CT angiography characterise the compression. In well-selected patients, laparoscopic division of the ligament relieves symptoms in the majority, which is why careful multidisciplinary selection is the heart of managing MALS. In many parts of the UK, routine NHS referrals for this kind of problem currently take 20-45+ weeks, whereas an initial appointment with a private consultant is typically available within around two weeks.
Seeing a specialist
Who to see, and how quickly you can be seen.
The specialist for this condition is usually a consultant vascular surgeon. Your GP can refer you on the NHS, or you can arrange a private consultation directly.
A quiet reminder
This guide is for information, not medical advice.
Your GP knows your history and can tell you which parts apply to you. If in doubt, see them - and seek urgent care for any of the emergency symptoms described above.
Frequently asked
Common questions about Median arcuate ligament syndrome.
Quick, plain-English answers to what people ask us most.
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What is median arcuate ligament syndrome?
Median arcuate ligament syndrome is a condition where a ligament in the diaphragm compresses the coeliac artery, a major blood vessel supplying the stomach and abdominal organs, causing chronic abdominal pain, particularly after eating. It's an uncommon cause of otherwise unexplained abdominal pain.
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What causes median arcuate ligament syndrome?
It results from an anatomical variation where the ligament sits in a position that compresses the coeliac artery, sometimes made worse during breathing. Not everyone with this anatomical variation develops symptoms, suggesting other factors may also contribute.
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What are the symptoms of median arcuate ligament syndrome?
Symptoms include chronic abdominal pain, often triggered or worsened by eating, sometimes leading to reduced food intake and weight loss, and occasionally an audible abdominal sound (bruit) on examination. Symptoms can overlap with other digestive conditions, sometimes delaying diagnosis.
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Is median arcuate ligament syndrome dangerous?
It's not immediately life-threatening, but chronic pain and weight loss can significantly affect quality of life without appropriate diagnosis and treatment. Surgical treatment can effectively relieve symptoms in well-selected patients.
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Is median arcuate ligament syndrome hereditary?
It relates to individual anatomical variation rather than a clearly established inherited pattern. Most cases occur without a specific known family history.
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Can median arcuate ligament syndrome be treated?
Yes, surgical release of the ligament causing compression can significantly relieve symptoms for many appropriately selected patients. Thorough investigation beforehand, to confirm this is genuinely the cause of symptoms, helps improve surgical outcomes.
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How is median arcuate ligament syndrome diagnosed?
Diagnosis typically involves specific imaging, such as CT or duplex ultrasound performed during inhalation and exhalation, to show the characteristic compression pattern of the artery, alongside careful exclusion of other more common causes of abdominal pain. Specialist assessment is important given the diagnostic complexity.
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How is median arcuate ligament syndrome treated?
Treatment usually involves surgical release of the compressing ligament, often via laparoscopic surgery, aiming to relieve the arterial compression. Success rates vary, and careful patient selection through thorough investigation improves outcomes.
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Median arcuate ligament syndrome vs coeliac disease — what's the difference?
Despite the similar-sounding name involving the coeliac artery, median arcuate ligament syndrome is an unrelated vascular condition causing abdominal pain from artery compression, whereas coeliac disease is an autoimmune condition triggered by gluten affecting the small intestine. These are entirely different conditions requiring completely different investigation and treatment approaches.
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When should I see a specialist about median arcuate ligament syndrome, and how quickly can I be seen privately?
Chronic, unexplained abdominal pain after eating not explained by standard investigation should prompt specialist vascular or gastroenterology assessment. Private specialist consultations can typically be arranged within about two weeks, considerably faster than standard NHS waiting times.