Peptic ulcers are open sores on the inner lining of the stomach and the upper part of the small intestine. The most common symptom of a peptic ulcer is stomach pain. Learn about peptic ulcers, open sores in the stomach or duodenum, and their causes, such as H pylori infection, aspirin, and stress. Find out how to diagnose, treat, and prevent peptic ulcers with medication, diet, and surgery. What is a Stomach Ulcer and How Is It Treated? A stomach ulcer occurs when a small area of the stomach's inner surface is damaged by stomach acid. This damage results in a shallow hole in the stomach lining. Stomach ulcers are like little sores on the inside of your tummy or the tubes connected to it. They develop when the stomach's protective mucus becomes ineffective. This can lead to damage from stomach acid, causing discomfort, stomach cramps, and other symptoms like pain and indigestion ... Learn about stomach ulcers, their symptoms, causes, treatments, and effective home remedies with expert advice from Dr. Pawan Rawal, top gastroenterologist in India.