Stomach ulcers are open sores that develop on the lining of the stomach. Gastric erosion occurs when the mucous membrane lining the stomach becomes inflamed. If they are left untreated, they become deeper and form an ulcer.
This disease is caused by the Helicobacter infection, certain medicines (for example, aspirin, non-steroid medicines against inflammation), and stress. The main symptoms of an ulcer are nausea, vomiting, heartburn, and sharp, burning pains in the upper abdomen at night, on an empty stomach (in the case of duodenal ulcer), or after eating (in the case of stomach ulcer).
It should be noted that functional dyspepsia syndrome which is very common can have the same symptoms. Only an endoscopic examination can answer this question accurately.