Causalgia: Complex Regional Pain Syndrome II Patients who experience chronic, severe burning pain in a limb due to an injury to a peripheral nerve may have once been told that they suffer from causalgia. Today, the condition is more often referred to as Type 2 Complex Regional Pain Syndrome (CRPS II). Peripheral nerves run from the brain and spine to the body’s extremities. In cases of Type 1 CRPS (CRPS I), pain develops even though there … [Read more...] about Causalgia: CRPS II