Autoimmune Condition Locks Up Woman (ABC News) "Tunick was experiencing the first of many episodes in which her muscles seized up painfully, a rare neurological condition known as Stiff Person Syndrome (SPS). Though the cause is unknown, SPS has features of an autoimmune disease in which the body's immune system attacks itself, setting off, in this case, muscle spasms." "And because the syndrome is so rare, it is often mistaken for a variety of musculoskeletal conditions, including Parkinson's disease, multiple sclerosis, fibromyalgia or something of a psychosomatic nature." 10-09

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