Stress ulcers cause sores in the gastrointestinal (GI) tract. They can cause pain, a burning sensation, and an increased risk of infection. The damage ranges from minor irritation to severe bleeding.

Stomach ulcers, or peptic ulcers, are sores in the lining of the stomach or the top part of the small intestine. Stomach ulcer pain often occurs in the upper part of the abdomen. Doctors classify the ...