Description:

Unilateral or bilateral pain in the distribution of one or more branches of the trigeminal nerve(s), indicative of neural damage but of unknown aetiology.

Diagnostic criteria:
  1. Unilateral or bilateral facial pain in the distribution(s) of one or both trigeminal nerve(s) and fulfilling criterion B
  2. Clinically evident positive (hyperalgesia, allodynia) and/or negative (hypaesthesia, hypalgesia) signs of trigeminal nerve dysfunction
  3. No cause has been identified
  4. Not better accounted for by another ICHD-3 diagnosis.