16635 Median Arcuate Ligament Syndrome Mals

Overview

Median arcuate ligament syndrome (MALS) happens when a band of tissue in your diaphragm presses on the main artery that supplies blood to your stomach and other organs. This can reduce blood flow and cause pain, especially after eating.

No, MALS is considered rare. Most doctors will only see a few cases in their career.

It can affect anyone, but it is most often diagnosed in women between the ages of 20 and 40. It can also appear in children and older adults.

Symptoms

Common symptoms

• Abdominal pain, particularly in the upper part of the belly, often after eating
• Nausea or feeling sick
• Unintentional weight loss
• Vomiting
• A feeling of fullness after only a small meal

Symptoms in children

• Pain after eating that can make children avoid food
• Poor weight gain or slow growth
• Nausea and vomiting
• Fussiness or tiredness around mealtimes

Symptoms in older adults

• Dull or cramping pain in the upper abdomen
• Loss of appetite
• Weight loss
• Symptoms that may be mistaken for other digestive conditions

Causes

Main causes

• Compression of the celiac artery by the median arcuate ligament
• The compression may also irritate nearby nerves
• The exact reason why some people develop this compression is not clear

Risk factors

• Being female
• Being between the ages of 20 and 40
• Having a low body weight or being underweight

When to see a doctor

See a doctor urgently if:

• If you have sudden, severe belly pain, or if you faint or vomit blood, seek emergency care immediately
• If you have new or worsening symptoms that prevent you from eating or drinking, see a doctor the same day

Book a routine appointment if:

• If you have repeated belly pain after meals, nausea, or unintentional weight loss, make a GP appointment to discuss your symptoms
• If a prior diagnosis of a digestive disorder is not fully explaining your symptoms, ask for a second opinion or a specialist referral

Diagnosis

Your doctor will start by listening to your history and doing a physical exam. Because MALS symptoms look like many other conditions, it’s often diagnosed after other disorders have been ruled out.

Tests that may be done

• Ultrasound of the abdomen, including a Doppler test to check blood flow in the celiac artery
• CT scan (computed tomography) with contrast
• MRI (magnetic resonance imaging) — sometimes with an angiogram
• Upper endoscopy to rule out other causes of pain
• A test that looks at the blood flow in the artery during breathing

What to expect at your appointment

Your healthcare professional will likely refer you to a gastroenterologist or a vascular specialist. The evaluation may take several appointments and involves careful listening to your symptoms, imaging tests, and sometimes a trial of medicines to help with discomfort.

Treatment

Treatment for MALS can range from supportive care and nutritional support to an intervention to release the ligament. The right approach depends on how much your symptoms affect your life and on a full assessment by your care team.

Self-care at home

• Eat small, frequent meals rather than large ones
• Avoid lying flat right after a meal
• Keep a food and symptom diary to identify triggers
• Practice stress-management techniques, as stress can worsen belly pain

Medical treatments

Your doctor may suggest a supervised, short-term diet that is easy to digest, or nutritional supplements to help you maintain a healthy weight. Other medical options, such as pain management or medicines to relax the blood vessel, may be prescribed — but any medicine will be chosen by your own doctor and should be used exactly as directed. Always discuss risks and benefits with your healthcare team.

When is surgery considered?

If symptoms are severe and don't improve with conservative measures, surgery to divide the ligament may be considered. This decision is made after careful testing and a discussion with a specialist. It is not the first step for everyone.

Living with this condition

Life with MALS can be challenging. It helps to plan meals so you can eat small amounts every few hours, stay hydrated, and let people close to you know what you’re going through.

Lifestyle tips

• Chew food well and eat slowly
• Take a gentle walk after eating if that feels comfortable
• Keep a heating pad nearby for mild pain (do not use it if your doctor advised against it)
• Try relaxation exercises like deep breathing or mindfulness

Diet and exercise

Your doctor or a registered dietitian may recommend ways to keep up your weight and energy. Regular, light physical activity is often fine, but avoid intense exercise right after meals.

Mental health and emotional wellbeing

Living with a chronic pain condition can sometimes lead to anxiety, frustration, or low mood. If you notice these feelings, it’s important to talk to your GP — you can get support through counselling, cognitive behavioural therapy (CBT), or joining a support group. If you ever feel in crisis, contact your local mental health crisis team or emergency services.

Prevention

MALS is a structural issue that cannot be prevented. However, early recognition and treatment can help limit the impact it has on your life.

Complications

If left untreated

• Unintended weight loss and undernutrition
• Reduced quality of life due to chronic pain
• Rarely, problems with blood flow to the digestive organs if the compression is very severe

Long-term outlook

With the right care, many people with MALS notice improvement. Surgery and other treatments help many, and most people can return to a full and active life. Patience and a supportive healthcare team make a big difference.

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