Doctor}} A physician, medical practitioner or medical doctor is a person who practices medicine and is concerned with maintaining or restoring human health through the study, diagnosis, and treatment of disease and injury. This is accomplished through a detailed knowledge of anatomy, physiology, diseases and treatment - the science of medicine - and its applied practice - the art or craft of medicine. Etymology The word physician comes from an ancient Greek noun (physis) and its derived adjecti… (More on Physician)