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Complex regional pain syndrome (CRPS) is a puzzling pain condition, typically occurring after trauma. Incidents as innocent as IV injection and vaccine administration may serve as the impetus for an as yet poorly understood cascade of neuro-inflammation and somatosensory changes. A condition with variable degrees of psychological involvement, disability, and purely clinical diagnostic criteria, the diagnosis is often significantly delayed before effective treatment is begun, decreasing the likelihood of success. A 58-year-old female initially presented with painless peripheral edema of the left arm without erythema or loss of function, with later bilateral development of multiple domains of symptoms consistent with CRPS. Plausible initiation events in this instance were an IV insertion in the left cubital fossa and vaccination into the right deltoid. Delay in diagnosis is common but utilization of the Budapest Criteria for diagnosis and prompt treatment improves outcomes.

Intramuscular Injection and Complex Regional Pain Syndrome Development After “Harmless” Procedures