Suspected C5 Nerve Root Injury Temporally Associated With Stellate Ganglion Block for Refractory Insomnia: A Case Report.

Suspected C5 nerve root injury temporally associated with stellate ganglion block is uncommon, and causality may be uncertain. Immediate radiating shoulder pain, lateral upper-arm numbness, and deltoid weakness require prompt cessation, neurological assessment, electrophysiological confirmation, neurotrophic treatment, and rehabilitation. Careful needle visualization and transparent reporting of diagnostic uncertainty are essential.