Trauma is a word many of us associate with the battlefield, or perhaps the athletic field – a wound, a shock, a blow--physical or mental. Now there’s growing understanding of how cities are affected by trauma – the people who live in some neighborhoods, and entire communities – and there’s more awareness of the awful toll trauma takes on health. Today the Urban Health Institute at Johns Hopkins has assembled dozens of experts to look at the impact of trauma on cities and on health. One of the speakers will be Baltimore’s Health Commissioner Leana Wen. She stopped by WYPR first to discuss trauma with us.