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Myasthenia Gravis

Myasthenia Gravis and Graves Disease



Please comment on the incidence of Graves disease and MG occuring together and any influence one might have on the other of these diseases. Thank You,


I can say that about 10% of patients with MG have a thyroid disease. A smaller percentage have Graves and MG. When a patient is hyperthyroid, the weakness caused by MG may become worse. Correction of the hyperthyroid state (which usually occurs with Graves) improves strength. Some patients with Graves become hypothyroid. This may worsen strength in a myasthenic patient. Correction of the low thyroid state will lead to improved strength also.

Graves often impairs eye movements. MG also impairs eye movements. In patients with Graves and MG affecting eye muscles at the same time, it may be difficult to distinguish what the primary problem is.

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Response by:

Henry J Kaminski, MD Henry J Kaminski, MD
Formerly, Professor of Neurology
School of Medicine
Case Western Reserve University