MALS: a compressed artery that many people have without pain.

The scan shows the ligament pressing on the artery. So do the scans of many people who feel perfectly well. That gap deserves a careful look before anyone operates.

This page is about understanding the condition and the role the brain and nervous system can play in it. It is not a diagnosis. Your own clinicians know your case.

What median arcuate ligament syndrome is

The median arcuate ligament is an arch of fibrous tissue where the diaphragm, the breathing muscle, attaches to the spine. The celiac artery, which supplies blood to the stomach, liver and spleen, passes just beneath it, together with a cluster of nerves called the celiac ganglion. In median arcuate ligament syndrome, or MALS, the ligament sits lower than usual and presses on the artery and the nerves.

Symptoms attributed to MALS include pain in the upper middle of the abdomen, particularly after eating, nausea, loss of appetite, weight loss, and diarrhoea or constipation. A minority of people have a whooshing sound (a bruit) that a clinician can hear with a stethoscope over the area. The compression can be seen on ultrasound or CT scan, where it may look dramatic.

The condition is rare. Treatment, when it is offered, is surgery to release the ligament, often done laparoscopically.

The neuroplastic contribution

Neuroplastic symptoms are real, physical symptoms produced by learned pathways in the brain and nervous system, a sensitized alarm system, rather than by ongoing damage, obstruction or disease. They are not imaginary and not "all in your head". Because the brain can change, they are reversible.

The ATNS Index of Neuroplastic Symptoms is careful here. It does not say MALS is a neuroplastic condition. It says MALS is not caused by neuroplastic symptoms, and that an evaluation for neuroplastic symptoms should nevertheless be part of a complete work-up, especially if the symptoms or the imaging findings are not typical. The reason is the awkward fact the index itself points out: many people with no symptoms at all have a similar degree of compression on their scans.

That matters for two reasons:

• A scan finding that is common in healthy people cannot, on its own, explain why one person has pain and another does not.
• Upper-abdominal pain after meals, nausea, appetite loss and bowel changes are also the classic outputs of a sensitized gut-brain system, the same mechanism behind functional dyspepsia and irritable bowel syndrome.

When pain is attributed to a structure that is often painless, and the planned treatment is irreversible, it is worth asking whether central sensitization is doing some of the work.

What the research shows

A narrative review of MALS notes that the exact prevalence is unknown because the diagnosis itself remains controversial, that radiographic compression is seen in a substantial proportion of people without symptoms, and that diagnosis is one of exclusion based on combining symptoms with imaging. A single-institution review of CT radiology reports found that of 128 cases of ligament-related narrowing of the celiac artery, only around 14 percent were symptomatic, with the authors concluding that most cases are asymptomatic. A paper on the psychiatric comorbidities of MALS reported that the diagnosis is complicated by a high incidence of psychological conditions in this patient group across the lifespan, and argued for assessing them before intervention.

To be honest about limits: these are reviews, case series and retrospective reports, not controlled trials, and some people do report lasting relief after ligament release. What the literature establishes is that compression on a scan is common and usually silent, and that the people who are diagnosed with MALS carry a heavy load of psychological distress. Both facts argue for assessing the nervous system's role before surgery, which is precisely what the index recommends.

Signs the brain may be part of the picture

• Your pain does not follow the expected pattern, for example it is present without eating, or in places the celiac artery does not supply.
• Your imaging findings are borderline, or the compression changes with breathing in a way the radiologist calls equivocal.
• Symptoms rise and fall with stress, sleep and mood as much as with meals.
• You have had other unexplained conditions: irritable bowel, pelvic pain, headaches, fatigue or dizziness.
• Previous treatments for the same pain, including other surgeries, gave short-lived relief.

A solution that addresses it

Pain and symptom reprocessing is an approach that works directly on the brain's contribution to persistent pain. It involves education about neuroplastic symptoms, somatic tracking (observing the abdominal sensation with curiosity rather than fear), lowering the sense of threat around eating, a graded return to normal meals and activity, emotional awareness and expression, and acceptance and commitment skills. It is delivered by trained clinicians and increasingly through digital programs. It can be used while you and your surgeon continue to weigh the structural question.

Cindra is a daily AI companion built around these approaches, with daily check-ins, short practices and plain-language lessons for people whose symptoms have a neuroplastic component. It supports your practice and never replaces your medical team's assessment. If you would like that support, join the waitlist.

What to do next

1. Complete the structural work-up with a gastroenterologist and, if needed, a vascular surgeon: endoscopy, imaging of the gall bladder and pancreas, and tests for ulcers and reflux. MALS should be a diagnosis of exclusion.
2. Ask your clinicians directly whether your symptoms and findings are typical. If they are not, ask for an assessment for neuroplastic symptoms before any irreversible procedure.
3. If a neuroplastic pattern fits, begin learning and practising while the structural question is settled. Nothing is lost by doing both.
4. Keep eating. Unintended weight loss from avoiding food needs medical attention regardless of cause.

Seek urgent care for severe sudden abdominal pain, vomiting blood, black stools, or rapid unexplained weight loss. The conditions index lists related articles.

This article is for general education and is not medical advice, and it does not diagnose or treat any condition. Persistent symptoms deserve a proper medical assessment to rule out disease or injury before a neuroplastic explanation is considered. If your symptoms are new, changing, or come with red-flag signs such as fever, unexplained weight loss, numbness or weakness, chest pain, or loss of bladder or bowel control, see a clinician promptly.