Thyrotoxic myopathy is a neuromuscular disorder that may accompany hyperthyroidism (Graves' disease, caused by overproduction of the thyroid hormone thyroxine). Symptoms may include muscle weakness, myalgias (muscle tenderness), wasting of the pelvic girdle and shoulder muscles, fatigue, and/or heat intolerance. Thyroid myopathy may be associated with rhabdomyolysis (acute muscle breakdown), damage to the muscles that control eye movement, and temporary, but severe, attacks of muscle weakness that are associated with low blood potassium levels (known as periodic paralysis).
National Institute of Diabetes and Digestive
and Kidney Diseases (NIDDK) National Institutes of Health, DHHS 31 Center Drive, Rm. 9A06 MSC 2560 Bethesda, MD 20892-2560 http://www.niddk.nih.gov Tel: 301-496-3583 TTY: 866-569-1162 |
Muscular Dystrophy Association 3300 East Sunrise Drive Tucson, AZ 85718-3208 mda@mdausa.org http://www.mda.org Tel: 520-529-2000 800-572-1717 Fax: 520-529-5300 |
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Last updated October 4, 2011