What are the causes of postherpetic neuralgia (PHN)?

Updated: Mar 06, 2018
  • Author: W Alvin McElveen, MD; Chief Editor: Robert A Egan, MD  more...
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See the list below:

  • Risk factors for development of PHN include the following:

    • Advancing age

    • Site of HZ involvement

      • Lower risk - Jaw, neck, sacral, and lumbar

      • Moderate risk - Thoracic

      • Highest risk - Trigeminal (especially ophthalmic division), brachial plexus

    • Severe prodromal pain (with HZ)

    • Severe rash

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