Intestinal Lymphangiectasia

In the primary form, the lymph vessels are abnormally formed, often for reasons that are not fully understood. Secondary forms can follow conditions that raise pressure in or block the lymph system, such as some heart conditions (for example constrictive pericarditis or after certain heart surgeries), liver disease with raised pressure, some infections, inflammatory conditions, and some tumours such as lymphoma. Your doctor will look for an underlying cause because treating it may improve the condition.

It is rare. It can be diagnosed in children and young people, but also in adults. Because the symptoms are non-specific, the diagnosis can be delayed.

Traditional dishes cooked with ghee, cream or fried foods can be high in fat. Ask your dietitian to help adapt family meals and gatherings so you can still share them, and ask whether fasting in Ramadan is safe for you.

Blood tests often show low protein (albumin), low immune cells (lymphocytes) and sometimes low cholesterol or calcium. Stool tests that measure protein loss, such as alpha-1 antitrypsin clearance, support the diagnosis. Upper endoscopy with small biopsies (tiny tissue samples) from the small bowel may show enlarged lymph vessels. Capsule endoscopy, imaging, and tests of the heart, liver and lymph glands are used to look for a cause. Other conditions that also cause protein loss need to be excluded.

Long-term follow-up and consistency with the diet make the biggest difference.

• Attend regular check-ups with blood tests for protein, calcium, vitamins and blood counts.

• Weigh yourself regularly and notice leg or belly swelling, and report changes.

• Wash hands and take infection precautions, as your immune defences may be lower.

• Ask your doctor which vaccines are recommended for you before receiving any, especially live vaccines.

• Do not stop the special diet without advice, even if you feel better.

Diet is the main treatment. The aim is to cut the amount of long-chain fat that enters the lymph vessels while keeping enough calories and protein. A dietitian experienced in this condition should guide you.

• Follow a very low-fat diet for long-chain fats as set by your dietitian.

• Medium-chain triglyceride (MCT) products can add calories because they are absorbed in a different way; use them only as advised.

• Eat enough protein; high-protein, low-fat foods are usually encouraged.

• Fat-soluble vitamins (A, D, E, K) and calcium often need supplementing; your doctor will advise.

• Read food labels and check fat content, and avoid frying with ordinary oils and ghee unless your dietitian says it is allowed.

For babies and children, feeding plans must be set by a paediatric specialist and dietitian. Never change a child's feeding without their advice.

There is no single cure by medicine. Medicines are used to treat the cause, replace what is lost and control complications. Your doctor decides what suits you.

• Vitamin and mineral supplements to correct deficiencies.

• Treatment for the underlying cause (for example heart, infection or inflammatory disease).

• Diuretics (water tablets) may be used for swelling in some people.

• Some specialists use other medicines in difficult cases. Discuss options, benefits and risks.

Procedures are not needed for most people but may be considered when a clear, limited area is responsible.

• Endoscopy with biopsy is used to confirm the diagnosis.

• If a short segment of bowel is the only affected part, surgery to remove it may be considered by a specialist team.

• Procedures on the heart or lymph system may be needed if they are the cause.

• Tubes or fluid drainage may be needed in severe fluid build-up.

Because the condition is rare, most advice comes from case series and expert experience rather than large trials. A strict low-fat diet with a special type of fat called medium-chain triglycerides is the mainstay. Research is ongoing into newer medicines and imaging methods for lymph vessels, but these are not routine yet.

Many people improve with diet and treatment of the cause, although the condition is often long-term and needs lifelong follow-up. Symptoms may come and go. Outlook depends on the underlying cause, so your specialist can give a view that fits you.

• What is causing the lymph leak in my case?

• Can you refer me to a dietitian for a low-fat plan?

• Which vitamins and minerals should I take?

• How often will I need blood tests?

• Which vaccines are safe for me?

This guide comes from the Saudi Gastroenterology Association (SGA) patient library, prepared by the Approved for publication by SGA; individual clinician review is ongoing. Last reviewed: 2026-04-24. It is for education and does not replace your doctor's advice.