The etiology of neuralgia amyotrophy remains unclear. Herpes zoster induced neuralgia amyotrphy has been reported in extremely rare cases. In this case report, we describe the clinical features and electrophysiologic findings in a 68-years-old patient with neuralgia amyotrophy associated with herpes zoster infection. We suggest that brachial plexus inflammation due to viral infection may be a direct cause of reversible neuralgia amyotrophy.