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Living with Pure mitochondrial myopathy

A rare mitochondrial muscle disease with slowly worsening limb weakness and tiredness, affecting only the muscles.

Understanding Pure mitochondrial myopathy

Pure mitochondrial myopathy is a rare mitochondrial disease that affects only the skeletal muscles.

It causes slowly worsening weakness in the limbs, wasting of muscles near the body's center, and eye muscle differences like drooping eyelids. People may have muscle pain, easy tiredness during or after activity, and trouble swallowing. GARD lists onset in childhood and the teen years.

Signs & symptoms

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

  • Weakness in the upper arms and thighs
  • Trouble with exercise and tiredness after activity
  • Trouble running or climbing stairs
  • Weak neck muscles
  • Waddling walk and frequent falls
  • Weak shoulder and hip muscles

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 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 and MitoAction may keep lists of experts for this condition.

Care & treatment

Care team
Genetic specialists (geneticists)
Expert care
Expert lists: United Mitochondrial Disease Foundation, MitoAction
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
Would genetic testing help find the cause?
How much exercise is safe for me?
How can swallowing and eye muscle problems be checked?

Quick facts

Symptoms usually startChild and as a Teenager
InheritanceMitochondrial

GARD lists mitochondrial inheritance, meaning it relates to the cell's energy-making parts. It doesn't name a gene here.

GeneticInherited MetabolicMitochondrial

Patient organizations

Source: NIH GARD · Pure mitochondrial myopathyGARD ID 20768 · 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 Pure mitochondrial myopathy.

Explore the Pure mitochondrial myopathy blog

Explore research for Pure mitochondrial myopathy

Explore actively recruiting Pure mitochondrial myopathy studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Pure mitochondrial myopathy 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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