Itch Hypotheses: From Pattern to Specificity and to Population Coding; Hermann O. Handwerker Epidemiology of Itch; Elke Weisshaar and Uwe Matterne Atopic Dermatitis; Ulf Darsow, Ulrike Raap, and Sonja Ständer Clinical Aspects of Itch: Psoriasis; Adam Reich and Jacek C. Szepietowski Pruritus in Renal Disease; Thomas Mettang Pruritus of Cholestasis; Nora V. Bergasa Neuropathic Itch; Anne Louise Oaklander Pruritus in Cutaneous T-Cell Lymphomas; L. Misery Pruriceptors; Matthias Ringkamp and Richard Meyer Peripheral Neuronal Mechanism of Itch 1: Histamine and Itch; Robin L. Thurmond, Kayvan Kazerouni, Sandra R. Chaplan, and Andrew J. Greenspan Role of PAR-2 in Neuroimmune Communication and Itch; Cordula Kempkes, Joerg Buddenkotte, Ferda Cevikbas, Timo Buhl, and Martin Steinhoff Mrgprs as Itch Receptors; Benjamin McNeil and Xinzhong Dong Role of Interleukin-31 and Oncostatin M in Itch and Neuroimmune Communication; Ferda Cevikbas, Cordula Kempkes, Timo Buhl, Christian Mess, Joerg Buddenkotte, and Martin Steinhoff Toll-Like Receptors and Itch; Tong Liu and Ru-Rong Ji Lipid Mediators and Itch; Tsugunobu Andoh and Yasushi Kuraishi The Role of Transient Receptor Potential Channels in Acute and Chronic Itch; Sarah R. Wilson and Diana M. Bautista Sensitization of Itch Signaling 2: Itch Sensitization—Nerve Growth Factor, Semaphorins; Mitsutoshi Tominaga and Kenji Takamori Peripheral Opioids; Paul L. Bigliardi and Mei Bigliardi-Qi Spinal Coding of Itch and Pain; Tasuku Akiyama and Earl Carstens Spinal Microcircuits and the Regulation of Itch; Sarah E. Ross, Junichi Hachisuka, and Andrew J. Todd Itch Modulation by VGLUT2-Dependent Glutamate Release from Somatic Sensory Neurons; Qiufu Ma Ascending Pathways for Itch; Steve Davidson, Hannah Moser, and Glenn Giesler The Brain Processing of Itch and Scratching; Hideki Mochizuki, Alexandru D.P. Papoiu, and Gil Yosipovitch Central Nervous Processing of Itch and Pain; Clemens Forster and Hermann O. Handwerker Roles of Central Opioid Receptor Subtypes in Regulating Itch Sensation; Mei-Chuan Ko Sensitization for Itch; Martin Schmelz Index