OverviewPellagra is a disease of deficiency of niacin (vitamin B3) which causes problems in the skin and the digestive and nervous systems.
Update Date 2/2/2015
Updated by: Emily Wax, RD, The Brooklyn Hospital Center, Brooklyn, NY. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.