Migraine, chronic back pain, colds, fatigue, panic attacks and high blood pressure can often be caused by stress. We now know that stress has a disasterous effect on our immune systems and can be a major cause of both mild and serious health problems. This book examines psychoneuroimmunology, or PNI, a science that attempts to solve these more common health problems. It points to new ways of controlling the damaging emotions that cause these complaints, thereby protecting the bodies natural defences and helping to ward off illness. Leon Chaitow is the author of Clean Body, Clean Mind and Stone Age Diet.