An Interview with Stephen Waxman, MD, author of Han C, Rush, AM, Sulayman D, et al. Sporadic onset of erythermalgia: A gain-of-function mutation in Nav1.7. Annals Neurol 2006;59:553-558. And Waxman SG, Sulayman D. Erythromelalgia: A hereditary pain syndrome enters the molecular era. Annals Neurol 2005;57:785-788. Interviewed by Ted Burns, MD and Erik Ensrud, MD