Arch Neurol Chicago
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Postherpetic pain persisting one month or longer occurs in 9% to 14% of patients with herpes zoster, diminishing with time. The incidence and duration are directly related to age. The pathologic features have been described but the pathogenesis of postherpetic neuralgia is unknown. ⋯ There is some support for the use of local physical modalities. Neurosurgical procedures are a possibility in failed medical cases. Controlled studies of newer approaches are necessary.