An ulcer is a small blister-like lesion in the lining of the digestive tract. Most ulcers are found in the upper portion of the small intestine. Ulcers can also occur in the stomach and, less frequently, in the esophagus.   It was once believed that ulcers were caused by stress or poor eating habits, doctors now believe that most ulcers are caused by an infection of the H. Pylori bacterium. Other causes of ulcers include taking aspirin or NSAIDS over a long period of time, heavy smoking and consuming large amounts of alcohol can also cause some varying types of ulceration. 

Treatment for ulcers caused by the H. Pylori bacterium is a specific round of antibiotics. Other treatments can include lifestyle changes and antacids. Symptoms include: a burning sensation, indigestion, belching, loss of appetite, nausea, vomiting, and diarrhea or constipation. Although rare, when complications arise they can be very serious; so it is important that your ulcers are treated under the supervision of your ADH physician.