Hi CG,

Some people get local or regional blocks when the problem is in a restricted area like the ankle and below. Most of the blocks though are either stellate ganglion blocks or lumbar sympathetic blocks, done alongside the spine, which are aimed at diagnosing and disrupting pain from the sympathetic nervous system. For some, breaking the cycle over a period of time can bring relief and symptom reduction. For others they don't do that much good and sometimes people have posted that it caused spread. Yes they are invasive and results vary but it is one more thing in the toolbox to consider. I myself have not had one, just a peripheral nerve block to the ankle. Is there a CRPS specialist anywhere you could go see? Even if you had to travel? There is a link with the SFN and CRPS.