Validity and reliability of the Arabic adapted version of the DN4 questionnaire (Douleur Neuropathique 4 Questions) for differential diagnosis of pain syndromes with a neuropathic or somatic component.

Background: Verbal descriptors of pain can provide a basis for distinguishing neuropathic pain (NP) from pain of non-neuropathic origin. Much research has been undertaken to develop screening tools for this purpose. The DN4 questionnaire (NP in four questions), is one of theses tools, which was developed and validated in French in 2005.