Myasthenia gravis is a disease of the junctions where nerves that
control muscle function meet the muscles themselves (the neuromuscular
junction). In myasthenia gravis patients, antibodies form within the
neuromuscular junction that make the transmission of nerve impulses
from nerve to muscle less efficient. This creates a variety of
problems which may include weakness of the peripheral muscles (usually
worsening with repetitive contraction of the muscles), droopy eyelids
(ptosis), double vision, and swallowing or breathing difficulties.