An ulcer is an erosion (open sore) on the surface of an organ or tissue. Ulcers most commonly erupt in the esophagus, stomach, and duodenum, in which case they are known as peptic ulcers. About five million Americans have peptic ulcers.
The problem begins, in most cases, with a spiral-shaped germ that seems to live for one purpose, digging holes in our stomachs. This bacterium, known as