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Living with Mitochondrial neurogastrointestinal encephalomyopathy

A condition (MNGIE) that mainly affects the digestive system and nervous system, with digestive problems, weight loss, and nerve symptoms.

Understanding Mitochondrial neurogastrointestinal encephalomyopathy

Mitochondrial neurogastrointestinal encephalomyopathy (MNGIE) is a condition that mainly affects the digestive system and the nervous system.

Almost everyone has slow movement of food through the digestive tract. This can cause feeling full early, nausea, vomiting after eating, belly pain or bloating, and diarrhea. People may also have severe weight loss, drooping eyelids or other eye muscle weakness, nerve problems (tingling, numbness, weakness mostly in the legs), and hearing loss. Brain white matter changes are common but usually do not cause symptoms. It starts anywhere from childhood to adulthood.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Slow movement of food through the gut (dysmotility)
  • Belly pain and bloating
  • Nausea and diarrhea
  • Drooping upper eyelids (ptosis)
  • Nerve damage causing numbness and weakness
  • Foot drop

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include brain and nervous system specialists, digestive system specialists, eye disease specialists and genetic specialists.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

  4. Connect with expert centers

    Association of Gastrointestinal Motility Disorders, United Leukodystrophy Foundation and Epilepsy Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Digestive system specialists (gastroenterologists); Eye disease specialists (ophthalmologists); Genetic specialists (geneticists)
Expert care
Expert lists: Association of Gastrointestinal Motility Disorders, United Leukodystrophy Foundation, Epilepsy Foundation
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with Association of Gastrointestinal Motility Disorders and other patient organizations
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
Can genetic testing for the TYMP gene or a blood test for thymidine confirm this diagnosis?
How can digestive symptoms and nutrition be managed?
Which specialists, such as for the gut and nerves, should be involved?

Quick facts

Symptoms usually startfrom Childhood to Adulthood
InheritanceAutosomal Recessive, Mitochondrial

This condition is caused by changes in the TYMP gene, which helps keep thymidine at healthy levels in mitochondria. It is autosomal recessive, which means a child inherits a changed copy of the gene from each parent.

GeneticNeurologicalGastrointestinalInherited MetabolicMitochondrial

Also known as: mitochondrial neurogastrointestinal encephalomyopathy syndrome; mitochondrial neurogastrointestinal encephalopathy; mitochondrial neurogastrointestinal encephalopathy syndrome; mitochondrial neurogastrointestingal encephalopathy; mngie; mngie syndrome

Patient organizations

Source: NIH GARD · Mitochondrial neurogastrointestinal encephalomyopathyGARD ID 9920 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

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