Mitochondrial myopathy is a type of muscle disease caused by dysfunction in the mitochondria, the energy-producing structures within cells. This condition can lead to muscle weakness, fatigue, and pain, as the muscles do not receive enough energy to function properly. Symptoms may vary widely among individuals and can also affect other systems in the body. The condition is often linked to genetic mutations that affect mitochondrial DNA. Diagnosis typically involves clinical evaluation, muscle biopsies, and genetic testing. While there is no cure, management strategies may include physical therapy and medications to help alleviate symptoms and improve quality of life.