What Is It?
A peptic ulcer is a sore or hole that forms in the lining of the stomach or intestine.
The word "peptic" refers to the digestive tract. An ulcer in the lining of the stomach is a gastric ulcer. An ulcer in the first part of the small intestine is a duodenal ulcer.
The lining of the stomach is a layer of special cells and mucous. Mucous prevents the stomach and duodenum from being damaged by acid and digestive enzymes.