The vagus nerve is the conductor of the orchestra of the human body: signals run between the organs and the brain, carrying information about the state of the body and informing if something needs to be paid attention to. Its full role in the workings of our bodies has long been a mystery. In this book, Dr. Nawaz Habib reveals how the vagus nerve regulates the functioning of the heart and lungs, intestines and kidneys and other organs, what will happen if it stops working correctly, and how it can be adjusted.