ICOP orofacial pain idiopathic orofacial pain 2025-07-07T17:31:21Z ICOP number: 6 Orofacial pain involving unilateral or bilateral intraoral or facial pain in the distribution(s) of one or more branches of the trigeminal nerve(s) for which the aetiology is unknown. The pain is usually persistent, of moderate intensity, poorly localized and described as dull, pressing or of burning character. PMID:32103673 Ava E. Cunningham