U.S. National Library of Medicine MedlinePlus: Benign Positional Vertigo National Institute of Health: Benign Positional Vertigo Benign Positional Vertigo "Benign positional vertigo" Benign Positional Vertigo National Institute of Health: Benign Positional Vertigo weird health-bugs http://www.nlm.nih.gov/medlineplus/ency/article/001420.htm "Benign positional vertigo"