Journal of Pain – Richard L. Nahin – National Center for Complementary and Integrative Health, National Institutes of Health, Bethesda, Maryland. Published Online: May 28, 2015. Highlights 2012 estimates of pain prevalence and severity are presented for U.S. adults. A simple, 2-item measure for categorizing pain severity is introduced. Pain persistence and bothersomeness designate 5… Continue Reading