Complex regional pain syndrome can affect any area of the body. However, it is most common after an impacting injury to the arms and legs. When complex regional pain syndrome spreads from the arms and legs to other parts of the body, it usually does so in a predictable pattern. For instance, the pain might move from one body part (like a limb) to the other or it could move from one part of the body to adjacent body part. Sometimes, the pain disorder affects parts of the body that are not close to the originally affected area.
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