What Is Autoimmune Enteropathy? Symptoms, Causes, and Treatment
Updated: 2 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026
Quick Answer
Autoimmune enteropathy is a rare autoimmune condition, mainly affecting infants, that damages the tiny villi of the small intestine so the baby cannot absorb nutrients from breast milk or formula. [5] Its hallmark is long-lasting, severe watery diarrhea early in life, often with dehydration. [5] Treatment involves intravenous fluids and nutrition plus corticosteroids and immunomodulators. [1] [3]
Key Takeaways
Autoimmune enteropathy is very rare, affecting an estimated 1 in 100,000 babies worldwide. [5]
The defining symptom is persistent watery diarrhea, usually beginning two to four weeks after birth. [5]
Damage to intestinal villi blocks nutrient absorption, which can lead to dehydration, low blood protein, and poor weight gain. [5]
Treatment centers on IV fluids, IV nutrition, and immune-calming medications; some children may eventually need a stem cell transplant. [5]
What the research says
Most affected children are infants with watery diarrhea, weight loss, and damaged intestinal villi, and early treatment helps. A review of 50 published pediatric cases found that 70% (35 children) were under one year old. Watery stool occurred in 86% and weight loss in 56%, serum anti-enterocyte or anti-goblet cell antibodies were positive in 64%, and every child had some degree of intestinal villous atrophy. Of the 37 children (74%) treated early, symptoms were relieved, and mortality was higher when the disease began in infancy. (Jin et al., BMC Pediatr, 2023) [3]
Treatment relies on supportive care and immune-calming drugs, and stem cell transplant can cure some forms. A literature review of 98 published reports (case reports and case series) found that supportive care to correct nutritional and metabolic deficiencies plus immunosuppressives and immunomodulators are the evidence-supported treatments, and that hematopoietic stem cell transplant is an aggressive but successful curative option for people whose disease is part of IPEX syndrome. Morbidity and mortality remain high. (Ahmed et al., Dig Dis Sci, 2019) [1]
Adults can be affected too, and the disease can be severe. In 13 adults diagnosed at a Dutch referral center between 2003 and 2019 (median age 52), 62% needed total parenteral nutrition and steroids induced remission in 62%. Four patients (31%) died of treatment-refractory malabsorption, while four (31%) reached long-term drug-free remission after immunosuppressive treatment. (van Wanrooij et al., Clin Transl Gastroenterol, 2021) [4]
What is autoimmune enteropathy?
Autoimmune enteropathy is a rare autoimmune disease that damages the small intestine. [1] [2] It most often affects babies, though adults can also develop it, far less frequently. [5] The condition is pronounced "AW-toh-ih-MYOON en-teh-RAH-puh-thee."
In this disease, the immune system mistakenly attacks and damages the intestine. That damage prevents the body from absorbing nutrients from breast milk or formula. Instead of being absorbed, those nutrients leave the body as severe watery diarrhea. Babies may become dehydrated and may not gain weight at the expected rate. [5]
How common is autoimmune enteropathy?
Autoimmune enteropathy is very rare. Experts estimate it affects about 1 in 100,000 babies worldwide. [5] Adults may have the disease, but much less often than infants. [5]
What are the symptoms of autoimmune enteropathy?
The main symptom is a steady flow of watery diarrhea instead of the soft stools that most newborns and babies produce. In this condition, the diarrhea does not go away within the usual two or three days. The diarrhea typically begins within two to four weeks after birth. [5]
Not urinating is another important symptom. A newborn should have at least five to six wet diapers a day. [5] Fewer wet diapers may signal that a baby is becoming dehydrated, which needs prompt attention.
Symptom | What it looks like | What it may mean |
Persistent watery diarrhea | Steady watery stools that do not resolve in 2–3 days, starting 2–4 weeks after birth | Immune system is damaging the small intestine |
Fewer wet diapers | Less than the expected 5–6 wet diapers per day for a newborn | Dehydration is developing |
Poor weight gain | Baby not gaining weight at the expected rate | Nutrients are passing through rather than being absorbed |
What causes autoimmune enteropathy?
Experts do not know the exact cause. However, babies with autoimmune enteropathy often have a type of primary immunodeficiency that damages the villi in their small intestines. [5]
Villi are microscopic, hair-like projections lining the walls of the small intestine. They absorb nutrients from food — in a baby's case, breast milk or formula — and shuttle those nutrients into the bloodstream. [5] When villi are damaged, absorption fails.
What complications can occur?
Because the damaged intestine cannot absorb nutrients properly, several complications can develop over time. [5]
Complication | What it means |
Dehydration | Fluid loss outpaces intake because of persistent watery diarrhea |
Hypoproteinemia | Abnormally low protein levels in the blood |
Frequent infections | The immune system problem leaves the baby more vulnerable |
Malabsorption | The body cannot absorb nutrients from breast milk or formula |
How is autoimmune enteropathy diagnosed?
A pediatrician starts by asking about the baby's symptoms and performing a physical examination. Because this disease is rare, testing helps confirm it and rule out other causes.
The pediatrician may order blood tests to identify specific immune system abnormalities, and flow cytometry, a test that uses a special laser to examine samples of immune system cells. [5] The pediatrician may also refer the family to a gastroenterologist for additional testing, such as a small intestine biopsy, or to a specialist in autoimmune disorders. [2]
Diagnostic step | Purpose |
Symptom history and physical exam | Assess diarrhea, hydration, and growth |
Blood tests | Identify specific immune system abnormalities |
Flow cytometry | Use a special laser to examine immune system cell samples |
Small intestine biopsy | Confirm intestinal damage (usually via gastroenterology referral) |
Autoimmune specialist referral | Evaluate for related immune system conditions |
How is autoimmune enteropathy treated?
Treatment focuses on replacing what the baby's body is losing and calming the immune attack on the intestine. A baby with this disease will likely receive fluids and nutrition intravenously (IV, through a vein). [5]
Medications that limit the immune system's attack on the small intestine may also be given. The specific drugs may include corticosteroids and immunomodulators. [1] [3]
Treatment | How it helps |
IV fluids | Replaces fluid lost through diarrhea and treats dehydration |
IV nutrition (parenteral nutrition) | Delivers nutrients directly into the bloodstream while the gut cannot absorb them |
Corticosteroids | Suppresses the immune attack on the intestinal lining |
Immunomodulators | Adjusts immune system activity to protect the small intestine |
What is the outlook?
Every baby is unique, so expectations depend on the individual situation. In some cases, drugs that protect the small intestine from immune system attacks help the body absorb nutrients again. [5]
However, babies with this disease often have an underlying issue with their immune systems. When that is the case, they may need different kinds of treatment and long-term medical support. For example, a healthcare provider may recommend a stem cell transplant for some children. [1]
Can adults get autoimmune enteropathy?
Yes, though it is very rare in adults, and the exact number is hard to estimate. In one European referral center, 13 adults were diagnosed with autoimmune enteropathy between 2003 and 2019, and 6 of them (46%) also had another autoimmune disease. [4]
When should I contact my baby's pediatrician?
If tests show a baby has autoimmune enteropathy, parents should contact the pediatrician any time they see changes in how often the baby urinates or has bowel movements — such as producing fewer wet diapers. [5]
An occasional loose stool or a slightly dry diaper is not a cause for alarm. Most of the time, a baby's digestive issues are not signs of a serious illness like autoimmune enteropathy. But changes in a baby's poop or urine that do not go away may be a reason to call the pediatrician — and to gain peace of mind.
What questions should I ask my baby's pediatrician?
Because autoimmune enteropathy is rare, many parents know very little about it at diagnosis. Helpful questions to bring to the appointment include:
Question | Why it matters |
Do you know why my baby has this disease? | Helps clarify whether an underlying immunodeficiency is involved |
What kind of treatment will my baby need? | Sets expectations for IV therapy and medications |
What are the treatment side effects? | Prepares parents for what to watch for at home |
How long will my baby need treatment? | Helps families plan for short- and long-term care |
Conclusion
Autoimmune enteropathy is rare, but its main warning sign is unmistakable: persistent watery diarrhea in a newborn that does not resolve within a few days. When the immune system attacks the intestinal villi, babies cannot absorb nutrients and can become dangerously dehydrated. Early evaluation by a pediatrician — with blood tests, flow cytometry, and sometimes a biopsy — can identify the condition and begin treatment with IV fluids, IV nutrition, and immune-calming medications. [1] If your newborn's diarrhea or wet diaper patterns keep changing, contact their pediatrician. Getting it checked is the fastest way to protect your baby and to get peace of mind.
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Frequently Asked Questions
What is autoimmune enteropathy?
Autoimmune enteropathy is a rare autoimmune disease, most often affecting babies, in which the immune system attacks the small intestine, causing persistent watery diarrhea and preventing nutrient absorption. [2] [4]
How common is autoimmune enteropathy?
Autoimmune enteropathy affects an estimated 1 in 100,000 babies worldwide. [5] Adults can have it too, but much less frequently.
When do symptoms usually start?
The watery diarrhea typically begins within two to four weeks after birth and does not resolve within the usual two to three days. [5]
What are the main symptoms?
The main symptom is a steady flow of watery diarrhea. [3] Fewer than five to six wet diapers a day in a newborn is another sign that may indicate dehydration. [5]
What causes autoimmune enteropathy?
The exact cause is unknown, but affected babies often have a primary immunodeficiency that damages the intestinal villi — the microscopic projections that absorb nutrients. [5]
What complications can it cause?
Possible complications include dehydration, hypoproteinemia (low blood protein), frequent infections, and malabsorption. [5]
How is it diagnosed?
A pediatrician combines a symptom history and physical exam with blood tests, flow cytometry (a laser-based cell analysis), and sometimes a small intestine biopsy or referral to a gastroenterologist or autoimmune specialist. [5]
How is it treated?
Treatment usually includes IV fluids and IV nutrition, plus medications that limit the immune attack on the intestine, such as corticosteroids and immunomodulators. [1] [3]
Can babies recover from autoimmune enteropathy?
In some cases, protective medications help the intestine absorb nutrients again. But because of the underlying immune problem, some children need long-term support and possibly a stem cell transplant. [1]
Can adults get autoimmune enteropathy?
Yes, though it is extremely rare. At one European referral center, 13 adults were diagnosed over about 17 years (2003 to 2019), and 6 of them (46%) also had another autoimmune disease. [4]
When should I call the pediatrician?
Contact the pediatrician if your baby's stool or wet diaper patterns change and do not return to normal — especially fewer wet diapers than the expected five to six per day. [5] An occasional loose stool is usually not a concern.
Related Reading
References
Ahmed Z, Imdad A, Connelly JA, et al. Autoimmune enteropathy: an updated review with special focus on stem cell transplant therapy. Dig Dis Sci. 2019;64(3):643-654. PMID: 30415406. DOI: https://doi.org/10.1007/s10620-018-5364-1
Chen CB, Tahboub F, Plesec T, et al. A review of autoimmune enteropathy and its associated syndromes. Dig Dis Sci. 2020;65(11):3079-3090. PMID: 32833153. DOI: https://doi.org/10.1007/s10620-020-06540-8
Jin M, Gong Y, Liu W, Zhong X. Clinical characteristics and management of autoimmune enteropathy in children: case reports and literature review. BMC Pediatr. 2023;23(1):601. PMID: 38017413. DOI: https://doi.org/10.1186/s12887-023-04435-x
van Wanrooij RLJ, Neefjes-Borst EA, Bontkes HJ, et al. Adult-onset autoimmune enteropathy in an European tertiary referral center. Clin Transl Gastroenterol. 2021;12(8):e00387. PMID: 34333499. DOI: https://doi.org/10.14309/ctg.0000000000000387
Cleveland Clinic. Autoimmune Enteropathy: What It Is, Symptoms & Causes. Cleveland Clinic Health Library. Last updated September 16, 2024. https://my.clevelandclinic.org/health/diseases/autoimmune-enteropathy
Medical disclaimer
This article is for general informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about any medical condition, especially concerning infants.
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