The media often report about the effect of stress on the immune system. What research supports the idea that certain individuals are more susceptible to stress than others, and how can physicians recognize patients who might be experiencing an immunological response to stress? What mechanisms might link rhinitis, asthma and chronic urticaria to stress? Dr. Gailen Marshall, professor of medicine and pediatrics at the University of Mississippi Medical Center, discusses the fascinating relationship between a patient's mental state and immunity. Dr. Todd Mahr hosts.