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Living with MELAS syndrome

A condition affecting the brain, nerves, and muscles, with stroke-like episodes, seizures, and muscle weakness.

Understanding MELAS syndrome

MELAS syndrome (mitochondrial encephalomyopathy, lactic acidosis, and stroke-like episodes) is a condition that affects many body systems, especially the brain, nerves, and muscles.

Signs most often appear in childhood after a period of normal development, but can begin at any age. Early symptoms include muscle weakness and pain, repeated headaches, loss of appetite, vomiting, and seizures. Most people have stroke-like episodes before age 40. Repeated episodes can gradually damage the brain.

Signs & symptoms

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

  • Stroke-like episodes
  • Seizures
  • Migraine-like headaches
  • Muscle weakness and muscle disease (myopathy)
  • Poor coordination and trouble walking (ataxia)
  • Memory loss and thinking problems (dementia)

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, ear, nose, and throat 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

    United Mitochondrial Disease Foundation, MitoAction and Muscular Dystrophy Association may keep lists of experts for this condition.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Ear, nose, and throat specialists (otolaryngologists); Eye disease specialists (ophthalmologists); Genetic specialists (geneticists)
Expert care
Expert lists: United Mitochondrial Disease Foundation, MitoAction, Muscular Dystrophy Association
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 United Mitochondrial Disease Foundation 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
Should we have mitochondrial DNA testing for our family?
What steps can lower stroke-like episodes or ease symptoms?
Which specialists should be on my care team?

Quick facts

Symptoms usually startfrom Childhood to Adulthood
InheritanceMitochondrial

Changes in genes (also called variants) cause this condition. It is mitochondrial, meaning it is passed from mother to children through the mitochondria in egg cells.

GeneticNeurologicalInherited MetabolicMitochondrial

Also known as: juvenile myopathy, encephalopathy, lactic acidosis, stroke; melas; melas - mitochondrial encephalopathy, lactic acidosis and stroke-like episodes; mitochondrial encephalomyopathy, lactic acidosis and stroke; mitochondrial encephalomyopathy, lactic acidosis and stroke-like episodes; mitochondrial encephalopathy, lactic acidosis, and stroke-like episodes

Patient organizations

Source: NIH GARD · MELAS syndromeGARD ID 7009 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with MELAS syndrome.

Explore the MELAS syndrome blog

Explore research for MELAS syndrome

Explore actively recruiting MELAS syndrome studies with HealthSpark.

HealthSpark

Find actively recruiting studies for MELAS syndrome with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
  • Share your city to look for research near you
  • Eligibility is confirmed by the study team

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Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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