How is herpetic and postherpetic neuralgia (PHN)differentiated from trigeminal neuralgia (TN)?

Updated: Jul 11, 2019
  • Author: Manish K Singh, MD; Chief Editor: Robert A Egan, MD  more...
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Herpetic and postherpetic neuralgia

Herpetic and postherpetic neuralgia (PHN) usually affects the first branch of the trigeminal nerve. The diagnosis of postherpetic neuralgia usually requires the outbreak of shingles (herpes zoster) in the forehead or eye. Acute herpetic neuralgia is the norm in shingles, but pain that persists after the lesions have healed is postherpetic neuralgia. The risk of development of postherpetic neuralgia is directly related to patient age.

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