Myasthenia gravis is a chronic autoimmune disorder that affects the neuromuscular junction. It leads to the weakening of voluntary muscles, causing muscle fatigue that worsens with activity and improves with rest. This condition can significantly impact daily activities and overall quality of life.

The disease is characterized by its ability to fluctuate in intensity, often making it difficult to predict when symptoms will worsen. Myasthenia gravis can affect various muscle groups, including those controlling eye and eyelid movement, facial expressions, chewing, talking, and swallowing.