NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 8,128 terms related to cancer and medicine.

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myasthenia gravis
(MY-us-THEE-nee-uh GRA-vis)
A disease in which antibodies made by a person’s immune system prevent certain nerve-muscle interactions. It causes weakness in the arms and legs, vision problems, and drooping eyelids or head. It may also cause paralysis and problems with swallowing, talking, climbing stairs, lifting things, and getting up from a sitting position. The muscle weakness gets worse during activity, and improves after periods of rest.