Muscle weakness, exercise intolerance, decreased hearing and vision, ataxia, seizures, learning difficulties, heart problems, diabetes, and poor growth are all signs of mitochondrial myopathy, none of which are unique to mitochondrial illness. Poor growth is one of the symptoms of mitochondrial disorders. Muscle weakness, muscle soreness, low muscle tone, and exercise intolerance are all symptoms of muscle weakness. Problems with vision and/or hearing. The sections of the body that require the most energy, such as the heart, brain, muscles, and gastrointestinal tract, are the ones that are most affected. Symptoms include fatigue, exercise intolerance, hearing loss, seizures, strokes, heart failure, diabetes, and renal failure, among others.