saudigastro.com/patients/protein-losing-enteropathy
Category
Chronic
Red flags
5
This article is educational and does not replace your doctor's advice. Seek urgent care for any red-flag symptoms.
What is it?
Protein-losing enteropathy (PLE) is not one disease but a sign of another problem. Normally the gut absorbs protein from food and only loses a small amount. In PLE, protein, especially albumin (the main protein in the blood that keeps fluid inside the blood vessels), leaks into the digestive tract faster than the liver and diet can replace it. As a result the blood albumin level falls (hypoalbuminaemia), and fluid can leak into the tissues, causing swelling (oedema).
How common is it?
It is uncommon. It can occur at any age, including in children, and is usually a complication of another condition in the gut, the lymphatic system or the heart.
Why does it happen?
There are three main types of cause. First, diseases with damage to the gut lining, such as Crohn's disease, coeliac disease, infections, or some infections of the bowel and medicines. Second, problems with the lymphatic vessels (the small channels that drain fluid and fat from the gut), such as intestinal lymphangiectasia (widened lymph vessels), lymphoma, and obstruction after certain heart operations or in heart failure. Third, conditions with increased pressure in veins, as in heart failure or constrictive pericarditis. Finding the cause is the main aim of the assessment.
Symptoms
- Swelling of the legs, ankles, feet, face, or abdomen
- Diarrhoea, which may be fatty or pale
- Belly pain, bloating, nausea and vomiting
- Weight loss or, with fluid retention, weight that does not match appetite
- Tiredness, weakness and muscle loss
- Frequent infections, because antibodies can be lost too
- In children, poor growth and delayed development
Red flags — seek urgent medical care
Shortness of breath, chest pain, or swelling that is rapidly getting worse
Fluid may be collecting around the lungs or heart. Go to the emergency department now.
Swelling or pain in one leg, with redness or warmth
May be a blood clot, which is more likely when protein is low. Seek urgent care.
Fever, chills or feeling very unwell
Infection risk is higher; seek urgent medical care.
Severe belly pain, repeated vomiting, or a rapidly swelling belly
May indicate a serious complication. Go to the emergency department.
A child with swelling, drowsiness, poor feeding, vomiting, breathing difficulty or very little urine
A child needing urgent care must be seen immediately. Go to the emergency department now.
How is it diagnosed?
Blood tests show low albumin and may show low antibodies, calcium, vitamins or lymphocytes (a type of white blood cell). Kidney and liver conditions, which are more common causes of low albumin, are checked first through blood and urine tests. PLE is confirmed with a stool test that measures a protein called alpha-1 antitrypsin, or, in some centres, with a nuclear scan. Then the cause is looked for using endoscopy and colonoscopy with biopsies, capsule endoscopy, CT or MR imaging, and heart tests. The doctor decides which are needed.
What the latest science says
Because PLE has many causes, specialist care often involves gastroenterologists, dietitians, heart specialists and others. In lymphatic causes, a special diet that limits some fats and uses a particular type of fat is a mainstay; in inflammatory causes, treating the inflammation can reverse the protein loss.
Outlook — what to expect
The outlook depends on the underlying cause. When the cause can be treated, such as inflammation or infection, protein levels often recover. Where it is a long-term condition, such as lymphatic problems, it is usually manageable with diet, medicines and monitoring, though it may need long-term follow-up. Early assessment reduces complications such as infections, blood clots and malnutrition.
Treatment
Habits & Lifestyle
Treatment focuses on the cause, but certain steps help with symptoms.
- Keep all appointments and blood tests, which show how protein levels are changing
- Weigh yourself regularly and note swelling, as your team advises
- Rest legs raised when seated to ease swelling, and walk regularly to lower the risk of clots
- Wash hands and avoid contact with people who are unwell, as you may be more prone to infection
- Do not take water tablets or salt substitutes unless prescribed
Diet
Nutrition is a key part of treatment and should be guided by a dietitian, because the right diet depends on the cause.
- Eat enough calories and a high-protein diet unless your doctor advises otherwise
- If the cause is a lymphatic problem, a low-fat diet with medium-chain triglyceride (MCT) oil (a type of fat that is absorbed without the lymphatic system) is often used
- Limit salt to help reduce swelling if advised
- Supplements of vitamins A, D, E, K, calcium and other minerals may be needed; take only what is prescribed
- Do not start restrictive or fad diets without your dietitian
Medications
Medicines treat the cause and the complications. Your doctor decides what you need.
- Anti-inflammatory or immune-modifying medicines for inflammatory bowel disease or related conditions
- Treatment of infection, coeliac disease (through a gluten-free diet) or other identified cause
- Treatment of heart conditions if they are the cause
- Diuretics (water tablets) or albumin infusions in selected people, in hospital or under close supervision
- Immunoglobulin replacement or blood-clot preventing medicines in selected situations
Procedures & Surgery
Procedures mostly help find the cause, and treat it in specific situations.
- Upper endoscopy and colonoscopy with biopsies
- Capsule endoscopy or enteroscopy to look at the small bowel
- CT, MRI, lymphatic imaging or echocardiography as needed
- Surgery or specialist procedures to treat a localised cause, such as a diseased bowel segment or heart or lymphatic problem, in selected people
Living with the condition
- Regular blood tests and dietitian visits help keep you stable
- Know the signs that need urgent help: shortness of breath, a hot swollen leg, fever, or rapid swelling
- Ask about vaccines to lower the risk of infection
Questions to ask your doctor
Save this list or print it before your appointment — doctors appreciate prepared patients.
- What is causing the protein loss in my case?
- Which tests do I still need?
- What diet should I follow, and can I see a dietitian?
- How will you monitor my protein level and my risk of infections and clots?
- Is this likely to improve or will I need long-term treatment?
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Status: Approved for publication by SGA; individual clinician review is ongoing · Published 24/04/2026
For general education only; it does not replace your doctor’s advice. Individual clinician review of this guide is ongoing. SGA clinician? Review this guide