A peptic ulcer is a hole in the lining of the stomach, duodenum, or esophagus. An ulcer is a sore or erosion that forms when the lining of the digestive system is corroded by acidic digestive juices.
It is defined as mucosal erosions equal to or greater than 0.5 cm.
Symptoms: Indigestion-like pain, Retching after eating, Weight loss, Loss of appetite.
More information can be found at http://en.wikipedia.org/wiki/Peptic_ulcer