Ulcers, which are open sores by definition, can occur in the lining anywhere along the gastrointestinal tract.
Ulcers are not normally dangerous, but they can be quit painful. Symptoms include heartburn, indigestion, loss of appetite, nausea, vomiting, diarrhea or constipation.
Ulcers usually occur in people between the ages of 20 and 50. The ulcers have a tendency to return so it is important to stay in contact with your gastroenterologist. Some ulcers are caused by a bacteria H. Pylori and can be treated with antibiotics.