Some of the symptoms include swelling usually in your extremities, burning/electric sensations, increased sweating at the site, muscle spasms, hot/cold sensations, a reddish color to the limb, joint stiffness. These symptoms usually occur near some sort of injury; in fact RSD is believed to be an over-reaction to an injury involving the autonomic nervous system and the immune system.
Here's a non-profit organization devoted to solving RSD/CRPS - that you might get more information from http://www.rsds.org/1/organization/index.html. Good luck!
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