Health condition
Mitochondrial disease
Mitochondrial diseases impair cellular energy production and can affect almost any organ - typically muscles, nerves, eyes, ears, heart and endocrine glands - with genetics that span both mitochondrial and nuclear DNA.
Why trust this guide
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Editorial team
Written by our editorial team from the UK sources listed on each page.
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Sourced from guidance
Checked against current NHS and UK specialist society guidance at the time of review.
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Current for 2026
Reviewed on 2026-09-27 with the next review scheduled for 2027-09-27.
Key facts
The essentials at a glance.
Which gene and test confirm it, who should be tested in the family, and which specialist to see.
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Caused by variants in mitochondrial DNA (maternally inherited) or in nuclear genes (usually recessive or dominant)
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Red flags: combinations such as muscle fatigue plus hearing loss plus diabetes, droopy eyelids with swallowing difficulty, or stroke-like episodes at a young age
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Diagnosis now usually starts with blood genetic testing rather than muscle biopsy
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No cure yet, but surveillance of the heart, hearing, vision and hormones prevents avoidable harm
Understanding the condition
What it is and what happens next.
What causes it, how it is confirmed, and the testing and specialist routes available in the UK.
What it is and how it presents
Mitochondria supply energy to every cell, so faulty ones injure the hungriest tissues first: brain, nerve, muscle, retina, cochlea, heart and pancreas. The result is patterns rather than a single disease - MELAS, MERRF, CPEO, Kearns-Sayre and many others - and patients typically accumulate diagnoses one organ at a time, seeing separate specialists for years before anyone joins the dots. A maternal family history of deafness, diabetes or muscle problems is a valuable clue.
Testing, surveillance and specialist care
Testing has moved decisively toward genomics: mitochondrial DNA analysis and nuclear gene panels from blood or urine identify most cases, with muscle biopsy reserved for the remainder. The UK's specialised centres (Newcastle, London, Oxford) coordinate diagnosis, organ surveillance and family advice, including counselling on maternal inheritance and reproductive options. NHS clinical genetics services carry some of the longest waits in the health service, often many months for a first appointment, whereas private genetic testing and a specialist review can typically be arranged within around two weeks.
Seeing a specialist
Who to see, and how quickly you can be seen.
The specialist for this condition is usually a neurologist at a specialist mitochondrial centre. Your GP can refer you on the NHS, or you can arrange a private consultation directly.
A quiet reminder
This guide is for information, not medical advice.
Your GP knows your history and can tell you which parts apply to you. If in doubt, see them - and seek urgent care for any emergency symptoms.
Frequently asked
Common questions about Mitochondrial disease.
Quick, plain-English answers to what people ask us most.
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What is mitochondrial disease?
Mitochondrial disease is a group of inherited disorders caused by faults in mitochondria, the structures within cells responsible for producing energy. Because energy-hungry organs like the brain, muscles and heart are most affected, symptoms can involve almost any part of the body.
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What causes mitochondrial disease?
It's caused by mutations in either mitochondrial DNA, inherited exclusively from the mother, or in nuclear DNA genes that control mitochondrial function, inherited in standard patterns. These mutations impair the cell's ability to generate sufficient energy.
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What are the symptoms of mitochondrial disease?
Symptoms vary enormously but commonly include muscle weakness and fatigue, exercise intolerance, seizures, hearing or vision loss, diabetes, heart problems and developmental issues in children. The combination of seemingly unrelated symptoms across organs is often a clue to diagnosis.
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Is mitochondrial disease serious?
Severity ranges widely from mild, manageable symptoms to severe, life-limiting disease, largely depending on the specific genetic mutation and how many organ systems are significantly affected. Some forms are compatible with a near-normal life, while others are much more serious.
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Is mitochondrial disease hereditary?
Yes, it is genetic, though inheritance patterns are complex and can be maternal, autosomal recessive, autosomal dominant or X-linked depending on the specific gene involved. Genetic counselling helps families understand their individual risk.
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Can mitochondrial disease be cured?
There is currently no cure for most forms, but management can significantly improve quality of life, and some specific genetic subtypes respond to targeted vitamin or cofactor treatment. Research into gene therapy and other targeted treatments is ongoing.
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How is mitochondrial disease treated?
Treatment focuses on managing individual symptoms such as seizures, heart or hearing problems, alongside supplements like coenzyme Q10 or riboflavin that may help specific subtypes, and avoiding triggers such as prolonged fasting or certain medications that stress mitochondrial function.
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When should I seek specialist assessment for suspected mitochondrial disease, and how quickly can I be seen privately?
Seek assessment if you or your child has unexplained symptoms spanning multiple organ systems, particularly with a family history of similar issues. NHS metabolic and neurology referrals can take considerable time, while a private specialist can typically arrange an initial work-up within about two weeks.