1. Mitochondrial diseases Mitochondrial diseases are chronic hereditary disorders that occur when mitochondria DNA has defects or mutations. Mitochondrial diseases can appear at any age, but usually appear at birth and can affect nearly every organ of the body. Many disorders can cause secondary mitochondrial dysfunction and have an effect on other diseases. Examples include: * Alzheimer’s disease * Muscular dystrophy * Lou Gehrig’s disease * Diabetes * Cancer 2. Eye conditions * Pathological my