An ulcer is an open sore. Peptic ulcers develop in the lining of the stomach or upper part of the small intestine (duodenum). ... Both the acid and bacteria irritate the lining and cause an ulcer to form. If left untreated, a H. pylori infection can cause gastritis (inflammation of the lining of the stomach).Acute gastritis is a sudden inflammation or swelling in the lining of the stomach. ... Gastritis only directly affects the stomach and may include nausea or vomiting, while gastroenteritis affects both the stomach and the intestines. Gastroenteritis symptoms may include diarrhea in addition to nausea or vomiting.Untreated gastritis can lead to ulcers, ongoing pain, ongoing inflammation, and bleeding, which can become life-threatening. ... A common cause of gastritis is now known to be due to the bacteria Helicobacter pylori, known as H.pylori, which infects the stomach.Gastric and duodenal ulcers are types of peptic ulcer. The main distinction is that they affect different parts of the digestive tract. A person could have both at the same time. Some causes of peptic ulcers include an excess of stomach acid, bacterial infection, and certain medications.It is characterized by a gnawing or burning sensation and occurs after meals—classically, shortly after meals with gastric ulcer and 2-3 hours afterward with duodenal ulcer. Food or antacids relieve the pain of duodenal ulcers but provide minimal relief of gastric ulcer pain.

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