Autonomic medicine is emerging across the globe as an important subspecialty in healthcare. The overwhelming majority of medicine today is based on the assumption that a patient's autonomic nervous system is intact and functioning normally. But what if it is not? What do we do when there are abnormalities in the regulatory functions of the body, such as maintaining normal blood flow to the heart, lungs, and brain while standing upright, or sweating properly to keep cool on a hot day? Introduction to Autonomic Medicine is the starting point for understanding the crucial role the autonomic nervous system plays in all of health care.