Patient education

Mitochondrial disease symptoms

Symptoms vary widely because energy-dependent organs can be affected in different combinations.

Fatigue, exercise intolerance, muscle weakness, or pain

Seizures, developmental differences, headaches, ataxia, or neuropathy

Vision or hearing loss

Heart, liver, kidney, endocrine, or gastrointestinal involvement

Use this information safely

This guide cannot diagnose a condition, predict an individual course, or recommend treatment. Bring relevant questions to a qualified clinician and use emergency services for urgent concerns.

Sources

References and further reading

  1. MedlinePlus: Mitochondrial Diseases
  2. NINDS: Mitochondrial Disorders
  3. GeneReviews: Primary Mitochondrial Disorders Overview
  4. United Mitochondrial Disease Foundation

External sources are provided for context and do not imply endorsement of MDA.

Next steps

Learn, connect, and participate

Mitochondrial disease guide

Understand inheritance, symptoms, diagnosis, management, and research.

Read the guide

Patient registry

Learn what participation means and how consent and privacy work.

Registry information

Clinical trials

Browse a source-linked directory and verify current study status.

Browse trials

Research hub

Follow therapies, mechanisms, publications, and funded work.

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Community support

Find practical resources, events, caregiver paths, and participation boundaries.

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All mitochondrial disease program

See the MDA program pathway and current planning status.

View program