Myasthenia gravis is a disease of the central nervous system that affects individuals of any age or ethnic group. It is characterized by sporadic muscular fatigue and weakness, occurring chiefly in the muscles of swallowing and chewing as well as the muscles of the eyes, face, and neck. The exact cause of myasthenia gravis not well understood, although it is believed to be a defect where the nerve meets the muscle. Also, the muscles of the arms and legs may become weak or easily fatigued. One of the first symptoms that many patients notice is double or blurred vision, and/or drooping of the eyelids.
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