Muscle disorders are conditions that affect the strength, function, and control of muscles in the body. These disorders can result from genetic factors, injuries, infections, or autoimmune diseases. Common types include muscular dystrophy, which is a group of inherited disorders causing muscle weakness, and myasthenia gravis, an autoimmune condition that leads to muscle fatigue. Symptoms of muscle disorders may include weakness, cramps, stiffness, or spasms. Diagnosis often involves physical examinations, blood tests, and imaging studies. Treatment options vary and may include physical therapy, medications, or lifestyle changes to help manage symptoms and improve quality of life.