Myasthenia gravis is a rare, chronic autoimmune disease. Autoimmune means that the body’s immune system cannot tell the difference between healthy cells and invaders like viruses, fungi, or bacteria. Because it cannot tell the difference, the body begins to attack and damage healthy cells. Chronic means that it lasts for a long time or never goes away completely. With myasthenia gravis (MG), the body attacks areas where nerves communicate with muscles. This communication is what makes muscles work. Without the ability to communicate properly, the muscles become weak and tire easily.(1)
Other condition names
Acquired myasthenia
Autoimmune myasthenia gravis
Inheritance type
Multigenic/multifactorial, Not applicable
Prevalence
Europe: 1-5 in 10,000
Worldwide: 1-9 in 100,000
United States: 1-5 in 10,000
Age of Onset
All ages
Myasthenia Gravis Fact Sheet. National Institute of Neurological Disorders and Stroke. Available at https://www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Fact-Sheets/Myasthenia-Gravis-Fact-Sheet. Accessed 12/8/2022.