Myasthenia Gravis
According to the Myasthenia Gravis Foundation of America, approximately 14 out of 100,000 individuals in the U.S. have been diagnosed with myasthenia gravis (MG). However, because MG is considered under diagnosed, the prevalence is thought to be much higher.

MG is a chronic autoimmune disease characterized by muscle weakness that increases during periods of activity and improves after periods of rest. Certain voluntary muscles such as those that control eye and eyelid movement, facial expression, chewing, talking, and swallowing are often, but not always, involved in the disorder. The muscles that control breathing and neck and limb movements may also be affected