A mystery condition that causes extreme pain worse than childbirth or kidney stones among sufferers has baffled doctors and researchers, who can find neither its cause nor its cure. Sufferers of Complex Regional Pain Syndrome (CRPS) wake up one morning to debilitating pain that does not go away. The condition usually affects the arms, legs, hands or feet and sometimes occurs after an injury as minor as a bruise, but often appears without any identified trauma.

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