I'm a headache specialist, and I learned more about our field, and how to think about migraine and similar disorders, from Joanna's book than from any class or lecture or other mentor I've ever had. This book takes you through the complex hall of mirrors that we have constructed to give some diseases legitimacy, and others not at all. It is an entire education in one volume, and one that will challenge most of your closely held beliefs about health and illness. Read it.