Stomach ulcer treatment. Gastroscope (endoscope) view of a gastric (peptic) ulcer of a 82 year-old female patient. The two haemostatic clips (silver) have stopped the bleeding of the ulcer. Ulcers are caused by excessive stomach acid (digestive juice). This acid, often combined with excess alcohol and caffeine, attacks the stomach wall, causing pain and discomfort. If the wall's protective mucus becomes thinned, possibly due to mental stress or bacterial attack, the acid can perforate the stomach wall. A perforated ulcer can result in anaemia and vomiting blood (haematemesis).