The very medicines many people take to relieve pain may actually be causing their headaches. A vicious cycle of pain relievers is behind too many cases of chronic headache. How can you break out of this insidious cycle? Guest: Joel Saper, M.D., FACP, FAAN, is founder and director of The Michigan Head-Pain and Neurological Institute. He is past president of the American Association for the Study of Headache, past chairman of the American Council for Headache Education. Dr. Saper is professor of medicine (neurology) at Michigan State University.