The cancer typically begins in the inner layer of the esophagus wall and grows outward, but it can start anywhere. Esophageal cancer is a rare cancer, accounting for just 1 percent of cancer cases ...

The esophagus (food tube) has special rings of muscle (sphincters) at the top and the bottom. If the esophageal sphincters don't close properly, acid can flow up the esophagus and into the throat ...