- Can occur anywhere, though typically in an extremity (leg > arm)
- Chronic neuropathic pain syndrome, typically related to trauma/injury/surgery
- Inciting event can be relatively minor or significant
- Thought to be related to PNS or CNS dysfunctional pain processing
- Injury, fracture, trauma, surgery
- Persistent (> 6m), severe and often progressive pain
- Very debilitating
- Neuropathic quality to pain: burning, pins/needles; often deep
- Affected area can appear red, mottled or otherwise discolored
- Abnormal temperature (cool or warm)
- Abnormal hair distribution (excess or limited)
- Abnormal nail growth
- Often very painful to even light touch