Cardiothoracic surgeons are highly trained medical professionals who specialize in surgical procedures of the heart, lungs, esophagus, and other organs in the chest cavity. They must complete extensive education and training, including medical school, a residency in general surgery, and a fellowship in cardiothoracic surgery. Cardiothoracic surgeons perform complex surgeries to treat conditions such as heart disease, lung cancer, and esophageal disorders.