Myasthenia Gravis Fact Sheet

  • In the United States, there are an estimated 20 cases of Myasthenia gravis in every 100,000 people, which would mean about 36,000 to 60,000 people have the disease. However, Myasthenia gravis often goes undiagnosed, so this number could be much higher. 

  • Myasthenia gravis can occur regardless of age, sex, or race.

  • Myasthenia gravis is not contagious, nor is it thought to be inherited. However, there are common occurrences of more than one person in a family having it. 

  • There is no cure for Myasthenia gravis.

  • About 10-15% of infants born to mothers with autoimmune MG will have a disorder called transient neonatal Myasthenia gravis.
    • This is caused by maternal antibodies crossing the placenta, which can cause Myasthenia gravis symptoms, including generalized weakness, at birth.
    • Infants with transient neonatal Myasthenia gravis tend to grow out of it in just a few weeks post-birth and do not have an increased risk for long term or future occurrences of Myasthenia gravis.

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