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NINDS Disorders is an index of neurological conditions provided by the National Institute of Neurological Disorders and Stroke. This valuable tool offers detailed descriptions, facts on treatment and prognosis, and patient organization contact information for over 500 identified neurological disorders.

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Thyrotoxic Myopathy

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).

Treatment

Treatment involves restoring normal levels of thyroid hormone and may include thyroid drugs, radioactive iodine, and sometimes partial or complete surgical removal of the thyroid.  

Prognosis

With treatment, muscle weakness may improve or be reversed.

Research

The NINDS supports a broad range of research on neuromuscular disorders such as thyrotoxic myopathy. Much of this research is aimed at learning more about these disorders and finding ways to prevent and treat them.

View a list of studies currently seeking patients.

View more studies on this condition.

Organizations

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
Tel: 301-496-3583 TTY: 866-569-1162

Muscular Dystrophy Association

Voluntary health agency that fosters neuromuscular disease research and provides patient care funded almost entirely by individual private contributors. MDA addresses the muscular dystrophies, spinal muscular atrophy, ALS, Charcot-Marie-Tooth disease, myasthenia gravis, Friedreich's ataxia, metabolic diseases of muscle, and inflammatory diseases of muscle, for a total of more than 40 neuromuscular diseases.

3300 East Sunrise Drive
Tucson, AZ 85718-3208
Tel: 520-529-2000 800-572-1717
Fax: 520-529-5300

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