What is an ulcer?

Ulcers are sores in the lining of the digestive tract. The digestive tract consists of esophagus, stomach, duodenum (first part of the intestines) and intestines. Most ulcers are located in the duodenum. These ulcers are called duodenal ulcers. Ulcers located in the stomach are called gastric ulcers. Ulcers in the esophagus are called esophageal ulcers.

lining of the digestive tract