Myasthenia gravis is an autoimmune disorder characterized by varying degrees of weakness of voluntary muscles. It is caused by antibodies against acetylcholine receptors at the neuromuscular junction, impairing transmission of impulses and causing muscle weakness that worsens with use. It most commonly affects young adult women and older men, though can occur at any age. Diagnosis involves history, physical exam, response to anticholinesterase drugs, and acetylcholine receptor antibody levels. Treatment includes anticholinesterase drugs, immunosuppressants, plasmapheresis, IVIG, and sometimes thymectomy. Complications can include myasthenic crisis of severe generalized weakness or cholinergic crisis from over