Type your response in the box. Peptic ulcers are sores in the lining of the intestine. An infection caused by a bacteria called Helicobacter pylori often causes these ulcers. The bacteria live in the mucus layer of the stomach. As the bacteria grow and reproduce, they can damage this lining. an illustration showing a normal stomach and a stomach with an ulcer What symptoms do you think a peptic ulcer would cause? Why do you think these symptoms would occur?