What are some signs of an ulcer? and what tests do they perform to see if you have one?

Pain in upper abdome: Symptoms of peptic ulcer are pain in abdomen anywhere from navel to breast bone, pain worse on empty stomach and better after eating, flares up at night, relief by taking acid supressors, disappear for few days and return again, nausea and vomiting, vomiting blood sometime, unexplained weight loss tests are endoscopy preferred, upper GI xrays, not done much these days as endoscopy gives you the diagnosis.