Erythromelalgia, also known as erythermalgia, is related to erythermalgia, primary and essential thrombocythemia, and has symptoms including constipation, diarrhea and pruritus. An important gene associated with Erythromelalgia is SCN9A (Sodium Voltage-Gated Channel Alpha Subunit 9), and among its related pathways/superpathways are Nervous system development and Activation of cAMP-Dependent PKA. The drugs Carbamazepine and Narcotics have been mentioned in the context of this disorder. Affiliated tissues include spinal cord and skin, and related phenotypes are nervous system and growth/size/body region