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What is mitochondrial disease?
Mitochondrial disease is a group of rare conditions that affect how the body makes energy. Mitochondria are the tiny structures in cells that help turn food into usable energy.
Because every part of the body needs energy, mitochondrial disease can affect many organs. Symptoms may involve the muscles, brain, heart, eyes, liver, kidneys or hearing.
Is it more common in children or adults?
Mitochondrial disease can affect both children and adults, but it is often first recognised in childhood. Some children show symptoms early in life because their energy needs are high and the condition may be more severe.
At the same time, many adults also live with mitochondrial disease, including people who were diagnosed later in life. In some cases, symptoms begin in adulthood or are mild enough in childhood that they are not noticed straight away.
So, it is not simply a childhood disease or an adult disease. It can appear at any age, and the age of diagnosis depends on the type of mitochondrial disorder and how obvious the symptoms are.
Why children are often diagnosed first
Children may be diagnosed earlier because problems with development, growth or muscle weakness can become visible quickly. Babies and young children may also have feeding difficulties, seizures, or delays in reaching milestones.
In more severe forms, symptoms can start soon after birth. These cases are more likely to come to medical attention early, which is why mitochondrial disease is often associated with childhood.
Why adults may be missed
Adults with mitochondrial disease may have symptoms that develop slowly over time. Tiredness, exercise intolerance, migraines, hearing loss or diabetes can be mistaken for more common conditions.
Some people do not receive a diagnosis until adulthood, even if they have had symptoms for years. This can happen because mitochondrial disease is rare and its symptoms vary widely from person to person.
What this means for families in the UK
In the UK, mitochondrial disease is considered rare, but it affects people of all ages. Families may first notice signs in a child, while others only find out after an adult relative is investigated.
If symptoms seem to affect several parts of the body, or there is a family history of similar problems, it may be worth discussing mitochondrial disease with a GP or specialist. Early assessment can help guide tests, support and treatment.
The bottom line
Mitochondrial disease is not more common in just one age group. It is often diagnosed in children, but many adults also live with the condition, and some are not diagnosed until later in life.
The key point is that mitochondrial disease can affect anyone. The age at which it appears depends on the specific type, severity and individual family history.
Frequently Asked Questions
Mitochondrial disease in children vs adults is a group of disorders that impair how cells make energy. In children, it often appears as developmental delay, muscle weakness, seizures, or growth problems, while in adults it may present more slowly with exercise intolerance, hearing loss, diabetes, neuropathy, or vision changes. The exact pattern varies widely from person to person.
The symptoms of mitochondrial disease in children vs adults can include fatigue, muscle weakness, poor growth, feeding problems, seizures, learning difficulties, headaches, diabetes, hearing loss, and vision issues. Children more often show developmental or multi-system problems early in life, while adults may notice progressive muscle, nerve, or organ-related symptoms later.
Diagnosis of mitochondrial disease in children vs adults usually involves a medical history, physical exam, blood and urine tests, genetic testing, imaging, and sometimes a muscle biopsy or other tissue studies. Doctors look for patterns of symptoms and test results that suggest a mitochondrial disorder, since the condition can be hard to identify and may resemble other illnesses.
Mitochondrial disease in children vs adults can be inherited through changes in nuclear DNA or mitochondrial DNA. Mitochondrial DNA is usually passed from the mother, while nuclear DNA changes can come from either parent. Some cases are inherited, and others happen for the first time in a person. Genetic counseling is often recommended to understand family risks.
Mitochondrial disease in children vs adults may appear earlier in children because development places high energy demands on the body, making energy-production problems more obvious. Severe genetic changes can cause symptoms soon after birth or in early childhood, while milder changes may not become noticeable until adulthood when the body’s energy needs or stressors reveal the disorder.
Mitochondrial disease in children vs adults often affects growth and development more clearly in children, leading to poor weight gain, short stature, delayed milestones, speech delay, or learning difficulties. Adults may have more stable development but can experience progressive weakness, fatigue, or organ involvement that affects daily functioning.
Treatment for mitochondrial disease in children vs adults is usually based on symptoms and supportive care rather than a cure. Children may need developmental therapies, feeding support, seizure management, and school services, while adults may focus more on fatigue management, mobility support, hearing or vision aids, and treatment of complications like diabetes or heart problems.
Lifestyle strategies for mitochondrial disease in children vs adults often include pacing activities, getting adequate rest, avoiding fasting, staying hydrated, and managing illness promptly. A balanced diet and individualized exercise plan may help, but recommendations should be tailored by the medical team because energy limitations vary greatly.
Yes, mitochondrial disease in children vs adults can worsen during infections, surgery, dehydration, fever, or other physical stressors because the body needs more energy during these times. Children may decompensate quickly, and adults may also experience sudden fatigue, weakness, or worsening neurologic symptoms. Early medical attention during illness is important.
A genetic counselor helps families understand the causes, inheritance patterns, testing options, and reproductive risks related to mitochondrial disease in children vs adults. They can explain results, discuss the chance of passing a condition to children, and support decision-making for current and future family planning.
Mitochondrial disease in children vs adults can affect the brain and nervous system by causing seizures, developmental delay, migraines, stroke-like episodes, neuropathy, or balance problems. In children, neurologic symptoms may show up as delayed learning or seizures, while adults may notice numbness, weakness, tremor, or cognitive changes.
Mitochondrial disease in children vs adults can involve the heart and may lead to cardiomyopathy, rhythm problems, or exercise intolerance. Heart complications may appear in infancy or childhood in more severe forms, but adults can also develop cardiac issues over time, so regular cardiac monitoring is often recommended.
Mitochondrial disease in children vs adults can cause vision loss, optic nerve problems, eye movement abnormalities, and hearing loss. In children, these issues may interfere with learning and development, while adults may notice gradual hearing decline or worsening vision. Eye and hearing exams are often part of ongoing care.
There is currently no universal cure for mitochondrial disease in children vs adults. Management focuses on relieving symptoms, preventing complications, and improving quality of life. Some specific genetic forms may have targeted treatments or supportive strategies, but care is usually individualized and long term.
Care for mitochondrial disease in children vs adults often involves a team that may include pediatric or adult neurologists, geneticists, metabolic specialists, cardiologists, ophthalmologists, audiologists, physical therapists, occupational therapists, speech therapists, and dietitians. Multidisciplinary care helps address the wide range of possible symptoms.
Mitochondrial disease in children vs adults commonly causes fatigue and reduced exercise tolerance because muscles cannot produce energy efficiently. Children may tire quickly during play or school activities, while adults may struggle with work, walking, or daily chores. Carefully paced activity may help, but overexertion can make symptoms worse.
Warning signs that mitochondrial disease in children vs adults may be worsening include frequent hospitalizations, increasing weakness, loss of skills, difficulty breathing, swallowing problems, worsening seizures, heart symptoms, or repeated episodes of severe fatigue. New or rapidly progressing symptoms should be evaluated promptly by a clinician.
Families supporting a child with mitochondrial disease in children vs adults at school may need an individualized education plan, accommodations for fatigue, extra time for tasks, rest breaks, support for mobility or vision needs, and communication with teachers about illness-related absences. The goal is to match school demands to the child’s energy and abilities.
Adults living with mitochondrial disease in children vs adults may need flexible schedules, energy conservation strategies, assistive devices, symptom-specific treatment, and workplace accommodations. Planning for rest, prioritizing essential tasks, and working with healthcare providers to manage symptoms can help maintain independence and function.
Families seeking support for mitochondrial disease in children vs adults can start with metabolic clinics, genetic counselors, patient advocacy organizations, hospital social workers, and rare disease support groups. These resources can help with education, care coordination, school or workplace accommodations, and emotional support.
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