Periodic Paralysis is a group of disorders whereby patients become weak due to triggers such as rest after exercise or certain foods. These disorders are part of a broader class of disorders called ion channelopathies, in which a genetic defect in a muscle ion channel results in symptoms of episodic stiffness or weakness in response to certain triggers.
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This site does not deal with paralysis due to stroke or spinal cord injury, but does contain some information about sleep paralysis, which is sometimes confused with periodic paralysis.