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Myasthenia gravis (MG) is a chronic autoimmune disorder in which the body attacks its own neuromuscular connections. This causes problems with communication between nerves and muscle. The result is weakness. MG affects the voluntary muscles of the body. The eyes, mouth, throat, and limbs are especially affected.

MG can occur at any age. This includes childhood. But it occurs most often in young adult women under age 40 and men over age 60.