What is the definition or description of: reflex sympathetic dystrophy?

RSD: RSD/Complex Regional Pain Syndrome is a diagnosis of exclusion. It is an injury that results in pain that seems disproportionate. It typically involves the extremities. Physical signs can be cool skin, loss of hair, sweating dysfunction, loss of hair, shiny skin, loss of bone density. Treatment is physical therapy, but pain may prevent this. Sympathetic nerve blocks can reduce pain to help PT.