Microvillus Inclusion Disease: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats Microvillus Inclusion Disease?
A pediatrician usually recognizes the problem first. A gastroenterologist, a doctor who specializes in the digestive system, manages the condition, often with a team including nutrition experts and transplant surgeons. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What it is
Microvillus inclusion disease is a rare genetic condition affecting the intestines, which absorb food and water. Tiny finger-like structures on intestinal cells, called microvilli, do not form properly, so the body cannot absorb nutrients and fluids. Babies develop severe, ongoing diarrhea in the first days or weeks of life.
Symptoms
The main symptom is watery diarrhea beginning within the first few days after birth that does not stop, even when the baby is fed through a vein. Babies may lose weight, become dehydrated, and have trouble growing. Fluid loss can also harm the kidneys and liver.
Causes and who gets it
Gene mutations make intestinal cells build microvilli incorrectly. The disease is autosomal recessive, meaning a child must receive a changed gene from both parents; carrying parents usually have no symptoms. It is very rare and affects children worldwide.
How doctors diagnose it
Doctors suspect it when a newborn has severe diarrhea continuing without food taken by mouth. Blood and stool tests help rule out infections. The main test is an intestinal biopsy examined for abnormal microvilli, and genetic testing can confirm the diagnosis.
Treatment
There is no cure. Care focuses on keeping the child hydrated and nourished, usually with long-term parenteral nutrition through a vein. This carries risks, including liver problems and infections, requiring close monitoring. Some children may be considered for an intestinal transplant, a major operation doctors weigh carefully for each child.
When to see a doctor
Any baby with diarrhea lasting more than a day or two should see a doctor. Seek care right away for signs of dehydration, such as fewer wet diapers, a dry mouth, sunken eyes, or unusual sleepiness. Early diagnosis helps start supportive care sooner.
How a direct primary care or concierge doctor fits in
A direct primary care doctor is paid a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works with insurance. Either can coordinate care and monitor growth, but they cannot perform biopsies or provide parenteral nutrition at home, so they refer families to specialists. More time for each visit can make coordinating that team easier.
Common questions
Is microvillus inclusion disease the same as celiac disease or lactose intolerance?
No. Those are common problems with food that can often be managed by changing the diet. Microvillus inclusion disease is a rare genetic condition present from birth, and it cannot be treated with diet changes alone.
Can this disease be prevented?
There is no known way to prevent it. Families with a child who has the disease may want to talk with a genetic counselor before future pregnancies.
Do children with this disease ever stop needing the vein-based nutrition?
Most children with the classic form of the disease need long-term parenteral nutrition because their intestines do not improve over time. Some atypical forms, which are less common, may be milder. Outcomes differ from child to child, so families should ask their specialist what to expect.
How common is this disease?
It is very rare. Exact numbers are hard to know, but it is estimated to affect only a small number of newborns worldwide each year.
Sources
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
