PTH and Huntington disease: Elevated PTH on the other hand has been suspected to be involved into the pathogenesis of CI in HD patients mainly due to the observation that patients suffering from distinct hyperparathyreoidism with itch have experienced complete relief of itch after parathyreoidectomy but PTH never proved a pruritic potency and the role of PTH in the pathogenesis of CI in dialysis patients is still a matter of debate [18, 25, 26].