CRPS: COMPLEX REGIONAL PAIN SYNDROME CRPS usually develops after an injury. The injury may be to the skin, bone, joints or tissue. This type has been called CRPS I or Reflex Sympathetic Dystrophy/RSD. CRPS can also develop after injury to major nerves. This type has been called causalgia or CRPS II. The injury that leads to CRPS may be only minor, and sometimes a patient cannot remember any injury or event that caused CRPS to start. The following symptoms are prevalent in a patient with CRPS: Characteristically, the pain is constant or almost constant and can be exacerbated by factors that do not usually cause pain: such as clothing, wind, cold or a light touch to the skin (called "allodynia"), and/or severe pain when only a slight pain would be expected, such as when a doctor lightly pricks the skin with a pin (called "hyperalgesia"). Additionally the patient will experience some of the following in the painful area: -Swelling -Changes in skin color (mottled, purple-bluish, red) -Skin temperature that is not normal (either warmer or colder than other areas) -Increased or decreased sweating in the affected area In general, the standard course of therapy will follow the chronic pain treatment continuum, and may include pain medications, exercise therapy, physical and occupational therapy, TENS, nerve blocks, neuromodulation, and neuroablation. Neurostimulation — particularly spinal cord stimulation — is an option for treating  unresolved neuropathic pain componenets.